fix: rename remaining zone -> pool (#11231)

cmd/background-newdisks-heal-ops.go

@@ -153,22 +153,22 @@ wait:
 					continue
 				}
 
-				zoneIdx := globalEndpoints.GetLocalZoneIdx(disk.Endpoint())
-				if zoneIdx < 0 {
+				poolIdx := globalEndpoints.GetLocalZoneIdx(disk.Endpoint())
+				if poolIdx < 0 {
 					continue
 				}
 
 				// Calculate the set index where the current endpoint belongs
-				z.serverPools[zoneIdx].erasureDisksMu.RLock()
+				z.serverPools[poolIdx].erasureDisksMu.RLock()
 				// Protect reading reference format.
-				setIndex, _, err := findDiskIndex(z.serverPools[zoneIdx].format, format)
-				z.serverPools[zoneIdx].erasureDisksMu.RUnlock()
+				setIndex, _, err := findDiskIndex(z.serverPools[poolIdx].format, format)
+				z.serverPools[poolIdx].erasureDisksMu.RUnlock()
 				if err != nil {
 					printEndpointError(endpoint, err, false)
 					continue
 				}
 
-				erasureSetInZoneDisksToHeal[zoneIdx][setIndex] = append(erasureSetInZoneDisksToHeal[zoneIdx][setIndex], disk)
+				erasureSetInZoneDisksToHeal[poolIdx][setIndex] = append(erasureSetInZoneDisksToHeal[poolIdx][setIndex], disk)
 			}
 
 			buckets, _ := z.ListBuckets(ctx)
@@ -181,11 +181,11 @@ wait:
 			for i, setMap := range erasureSetInZoneDisksToHeal {
 				for setIndex, disks := range setMap {
 					for _, disk := range disks {
-						logger.Info("Healing disk '%s' on %s zone", disk, humanize.Ordinal(i+1))
+						logger.Info("Healing disk '%s' on %s pool", disk, humanize.Ordinal(i+1))
 
 						// So someone changed the drives underneath, healing tracker missing.
 						if !disk.Healing() {
-							logger.Info("Healing tracker missing on '%s', disk was swapped again on %s zone", disk, humanize.Ordinal(i+1))
+							logger.Info("Healing tracker missing on '%s', disk was swapped again on %s pool", disk, humanize.Ordinal(i+1))
 							diskID, err := disk.GetDiskID()
 							if err != nil {
 								logger.LogIf(ctx, err)
@@ -209,7 +209,7 @@ wait:
 							continue
 						}
 
-						logger.Info("Healing disk '%s' on %s zone complete", disk, humanize.Ordinal(i+1))
+						logger.Info("Healing disk '%s' on %s pool complete", disk, humanize.Ordinal(i+1))
 
 						if err := disk.Delete(ctx, pathJoin(minioMetaBucket, bucketMetaPrefix),
 							healingTrackerFilename, false); err != nil && !errors.Is(err, errFileNotFound) {

cmd/endpoint.go

@@ -196,7 +196,7 @@ func NewEndpoint(arg string) (ep Endpoint, e error) {
 	}, nil
 }
 
-// ZoneEndpoints represent endpoints in a given zone
+// ZoneEndpoints represent endpoints in a given pool
 // along with its setCount and setDriveCount.
 type ZoneEndpoints struct {
 	SetCount     int
@@ -207,8 +207,8 @@ type ZoneEndpoints struct {
 // EndpointServerPools - list of list of endpoints
 type EndpointServerPools []ZoneEndpoints
 
-// GetLocalZoneIdx returns the zone which endpoint belongs to locally.
-// if ep is remote this code will return -1 zoneIndex
+// GetLocalZoneIdx returns the pool which endpoint belongs to locally.
+// if ep is remote this code will return -1 poolIndex
 func (l EndpointServerPools) GetLocalZoneIdx(ep Endpoint) int {
 	for i, zep := range l {
 		for _, cep := range zep.Endpoints {
@@ -222,7 +222,7 @@ func (l EndpointServerPools) GetLocalZoneIdx(ep Endpoint) int {
 	return -1
 }
 
-// Add add zone endpoints
+// Add add pool endpoints
 func (l *EndpointServerPools) Add(zeps ZoneEndpoints) error {
 	existSet := set.NewStringSet()
 	for _, zep := range *l {
@@ -478,8 +478,8 @@ func (endpoints Endpoints) UpdateIsLocal(foundPrevLocal bool) error {
 						// participate atleast one disk and be local.
 						//
 						// In special cases for replica set with expanded
-						// zone setups we need to make sure to provide
-						// value of foundPrevLocal from zone1 if we already
+						// pool setups we need to make sure to provide
+						// value of foundPrevLocal from pool1 if we already
 						// found a local setup. Only if we haven't found
 						// previous local we continue to wait to look for
 						// atleast one local.

cmd/erasure-server-sets.go

@@ -51,7 +51,7 @@ func (z *erasureServerPools) SingleZone() bool {
 	return len(z.serverPools) == 1
 }
 
-// Initialize new zone of erasure sets.
+// Initialize new pool of erasure sets.
 func newErasureServerPools(ctx context.Context, endpointServerPools EndpointServerPools) (ObjectLayer, error) {
 	var (
 		deploymentID string
@@ -127,9 +127,9 @@ func (z *erasureServerPools) SetDriveCount() int {
 	return z.serverPools[0].SetDriveCount()
 }
 
-type serverPoolsAvailableSpace []zoneAvailableSpace
+type serverPoolsAvailableSpace []poolAvailableSpace
 
-type zoneAvailableSpace struct {
+type poolAvailableSpace struct {
 	Index     int
 	Available uint64
 }
@@ -154,10 +154,10 @@ func (z *erasureServerPools) getAvailableZoneIdx(ctx context.Context, size int64
 	// choose when we reach this many
 	choose := rand.Uint64() % total
 	atTotal := uint64(0)
-	for _, zone := range serverPools {
-		atTotal += zone.Available
-		if atTotal > choose && zone.Available > 0 {
-			return zone.Index
+	for _, pool := range serverPools {
+		atTotal += pool.Available
+		if atTotal > choose && pool.Available > 0 {
+			return pool.Index
 		}
 	}
 	// Should not happen, but print values just in case.
@@ -165,8 +165,8 @@ func (z *erasureServerPools) getAvailableZoneIdx(ctx context.Context, size int64
 	return -1
 }
 
-// getServerPoolsAvailableSpace will return the available space of each zone after storing the content.
-// If there is not enough space the zone will return 0 bytes available.
+// getServerPoolsAvailableSpace will return the available space of each pool after storing the content.
+// If there is not enough space the pool will return 0 bytes available.
 // Negative sizes are seen as 0 bytes.
 func (z *erasureServerPools) getServerPoolsAvailableSpace(ctx context.Context, size int64) serverPoolsAvailableSpace {
 	if size < 0 {
@@ -208,7 +208,7 @@ func (z *erasureServerPools) getServerPoolsAvailableSpace(ctx context.Context, s
 				available = 0
 			}
 		}
-		serverPools[i] = zoneAvailableSpace{
+		serverPools[i] = poolAvailableSpace{
 			Index:     i,
 			Available: available,
 		}
@@ -216,14 +216,14 @@ func (z *erasureServerPools) getServerPoolsAvailableSpace(ctx context.Context, s
 	return serverPools
 }
 
-// getZoneIdx returns the found previous object and its corresponding zone idx,
-// if none are found falls back to most available space zone.
+// getZoneIdx returns the found previous object and its corresponding pool idx,
+// if none are found falls back to most available space pool.
 func (z *erasureServerPools) getZoneIdx(ctx context.Context, bucket, object string, opts ObjectOptions, size int64) (idx int, err error) {
 	if z.SingleZone() {
 		return 0, nil
 	}
-	for i, zone := range z.serverPools {
-		objInfo, err := zone.GetObjectInfo(ctx, bucket, object, opts)
+	for i, pool := range z.serverPools {
+		objInfo, err := pool.GetObjectInfo(ctx, bucket, object, opts)
 		switch err.(type) {
 		case ObjectNotFound:
 			// VersionId was not specified but found delete marker or no versions exist.
@@ -236,7 +236,7 @@ func (z *erasureServerPools) getZoneIdx(ctx context.Context, bucket, object stri
 			}
 		}
 		// delete marker not specified means no versions
-		// exist continue to next zone.
+		// exist continue to next pool.
 		if !objInfo.DeleteMarker && err != nil {
 			continue
 		}
@@ -376,7 +376,7 @@ func (z *erasureServerPools) CrawlAndGetDataUsage(ctx context.Context, bf *bloom
 		defer updateTicker.Stop()
 		var lastUpdate time.Time
 
-		// We need to merge since we will get the same buckets from each zone.
+		// We need to merge since we will get the same buckets from each pool.
 		// Therefore to get the exact bucket sizes we must merge before we can convert.
 		var allMerged dataUsageCache
 
@@ -477,8 +477,8 @@ func (z *erasureServerPools) GetObjectNInfo(ctx context.Context, bucket, object
 
 	object = encodeDirObject(object)
 
-	for _, zone := range z.serverPools {
-		gr, err = zone.GetObjectNInfo(ctx, bucket, object, rs, h, lockType, opts)
+	for _, pool := range z.serverPools {
+		gr, err = pool.GetObjectNInfo(ctx, bucket, object, rs, h, lockType, opts)
 		if err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
 				continue
@@ -500,8 +500,8 @@ func (z *erasureServerPools) GetObject(ctx context.Context, bucket, object strin
 
 	object = encodeDirObject(object)
 
-	for _, zone := range z.serverPools {
-		if err := zone.GetObject(ctx, bucket, object, startOffset, length, writer, etag, opts); err != nil {
+	for _, pool := range z.serverPools {
+		if err := pool.GetObject(ctx, bucket, object, startOffset, length, writer, etag, opts); err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
 				continue
 			}
@@ -521,8 +521,8 @@ func (z *erasureServerPools) GetObjectInfo(ctx context.Context, bucket, object s
 	}
 
 	object = encodeDirObject(object)
-	for _, zone := range z.serverPools {
-		objInfo, err = zone.GetObjectInfo(ctx, bucket, object, opts)
+	for _, pool := range z.serverPools {
+		objInfo, err = pool.GetObjectInfo(ctx, bucket, object, opts)
 		if err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
 				continue
@@ -538,7 +538,7 @@ func (z *erasureServerPools) GetObjectInfo(ctx context.Context, bucket, object s
 	return objInfo, ObjectNotFound{Bucket: bucket, Object: object}
 }
 
-// PutObject - writes an object to least used erasure zone.
+// PutObject - writes an object to least used erasure pool.
 func (z *erasureServerPools) PutObject(ctx context.Context, bucket string, object string, data *PutObjReader, opts ObjectOptions) (ObjectInfo, error) {
 	// Validate put object input args.
 	if err := checkPutObjectArgs(ctx, bucket, object, z); err != nil {
@@ -556,7 +556,7 @@ func (z *erasureServerPools) PutObject(ctx context.Context, bucket string, objec
 		return ObjectInfo{}, err
 	}
 
-	// Overwrite the object at the right zone
+	// Overwrite the object at the right pool
 	return z.serverPools[idx].PutObject(ctx, bucket, object, data, opts)
 }
 
@@ -570,8 +570,8 @@ func (z *erasureServerPools) DeleteObject(ctx context.Context, bucket string, ob
 	if z.SingleZone() {
 		return z.serverPools[0].DeleteObject(ctx, bucket, object, opts)
 	}
-	for _, zone := range z.serverPools {
-		objInfo, err = zone.DeleteObject(ctx, bucket, object, opts)
+	for _, pool := range z.serverPools {
+		objInfo, err = pool.DeleteObject(ctx, bucket, object, opts)
 		if err == nil {
 			return objInfo, nil
 		}
@@ -608,8 +608,8 @@ func (z *erasureServerPools) DeleteObjects(ctx context.Context, bucket string, o
 		return z.serverPools[0].DeleteObjects(ctx, bucket, objects, opts)
 	}
 
-	for _, zone := range z.serverPools {
-		deletedObjects, errs := zone.DeleteObjects(ctx, bucket, objects, opts)
+	for _, pool := range z.serverPools {
+		deletedObjects, errs := pool.DeleteObjects(ctx, bucket, objects, opts)
 		for i, derr := range errs {
 			if derr != nil {
 				derrs[i] = derr
@@ -626,7 +626,7 @@ func (z *erasureServerPools) CopyObject(ctx context.Context, srcBucket, srcObjec
 
 	cpSrcDstSame := isStringEqual(pathJoin(srcBucket, srcObject), pathJoin(dstBucket, dstObject))
 
-	zoneIdx, err := z.getZoneIdx(ctx, dstBucket, dstObject, dstOpts, srcInfo.Size)
+	poolIdx, err := z.getZoneIdx(ctx, dstBucket, dstObject, dstOpts, srcInfo.Size)
 	if err != nil {
 		return objInfo, err
 	}
@@ -634,12 +634,12 @@ func (z *erasureServerPools) CopyObject(ctx context.Context, srcBucket, srcObjec
 	if cpSrcDstSame && srcInfo.metadataOnly {
 		// Version ID is set for the destination and source == destination version ID.
 		if dstOpts.VersionID != "" && srcOpts.VersionID == dstOpts.VersionID {
-			return z.serverPools[zoneIdx].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
+			return z.serverPools[poolIdx].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
 		}
 		// Destination is not versioned and source version ID is empty
 		// perform an in-place update.
 		if !dstOpts.Versioned && srcOpts.VersionID == "" {
-			return z.serverPools[zoneIdx].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
+			return z.serverPools[poolIdx].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
 		}
 		// Destination is versioned, source is not destination version,
 		// as a special case look for if the source object is not legacy
@@ -649,7 +649,7 @@ func (z *erasureServerPools) CopyObject(ctx context.Context, srcBucket, srcObjec
 			// CopyObject optimization where we don't create an entire copy
 			// of the content, instead we add a reference.
 			srcInfo.versionOnly = true
-			return z.serverPools[zoneIdx].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
+			return z.serverPools[poolIdx].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
 		}
 	}
 
@@ -661,7 +661,7 @@ func (z *erasureServerPools) CopyObject(ctx context.Context, srcBucket, srcObjec
 		MTime:                dstOpts.MTime,
 	}
 
-	return z.serverPools[zoneIdx].PutObject(ctx, dstBucket, dstObject, srcInfo.PutObjReader, putOpts)
+	return z.serverPools[poolIdx].PutObject(ctx, dstBucket, dstObject, srcInfo.PutObjReader, putOpts)
 }
 
 func (z *erasureServerPools) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (ListObjectsV2Info, error) {
@@ -783,20 +783,20 @@ func (z *erasureServerPools) ListMultipartUploads(ctx context.Context, bucket, p
 		return z.serverPools[0].ListMultipartUploads(ctx, bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
 	}
 
-	var zoneResult = ListMultipartsInfo{}
-	zoneResult.MaxUploads = maxUploads
-	zoneResult.KeyMarker = keyMarker
-	zoneResult.Prefix = prefix
-	zoneResult.Delimiter = delimiter
-	for _, zone := range z.serverPools {
-		result, err := zone.ListMultipartUploads(ctx, bucket, prefix, keyMarker, uploadIDMarker,
+	var poolResult = ListMultipartsInfo{}
+	poolResult.MaxUploads = maxUploads
+	poolResult.KeyMarker = keyMarker
+	poolResult.Prefix = prefix
+	poolResult.Delimiter = delimiter
+	for _, pool := range z.serverPools {
+		result, err := pool.ListMultipartUploads(ctx, bucket, prefix, keyMarker, uploadIDMarker,
 			delimiter, maxUploads)
 		if err != nil {
 			return result, err
 		}
-		zoneResult.Uploads = append(zoneResult.Uploads, result.Uploads...)
+		poolResult.Uploads = append(poolResult.Uploads, result.Uploads...)
 	}
-	return zoneResult, nil
+	return poolResult, nil
 }
 
 // Initiate a new multipart upload on a hashedSet based on object name.
@@ -838,14 +838,14 @@ func (z *erasureServerPools) PutObjectPart(ctx context.Context, bucket, object,
 		return z.serverPools[0].PutObjectPart(ctx, bucket, object, uploadID, partID, data, opts)
 	}
 
-	for _, zone := range z.serverPools {
-		_, err := zone.GetMultipartInfo(ctx, bucket, object, uploadID, opts)
+	for _, pool := range z.serverPools {
+		_, err := pool.GetMultipartInfo(ctx, bucket, object, uploadID, opts)
 		if err == nil {
-			return zone.PutObjectPart(ctx, bucket, object, uploadID, partID, data, opts)
+			return pool.PutObjectPart(ctx, bucket, object, uploadID, partID, data, opts)
 		}
 		switch err.(type) {
 		case InvalidUploadID:
-			// Look for information on the next zone
+			// Look for information on the next pool
 			continue
 		}
 		// Any other unhandled errors such as quorum return.
@@ -867,14 +867,14 @@ func (z *erasureServerPools) GetMultipartInfo(ctx context.Context, bucket, objec
 	if z.SingleZone() {
 		return z.serverPools[0].GetMultipartInfo(ctx, bucket, object, uploadID, opts)
 	}
-	for _, zone := range z.serverPools {
-		mi, err := zone.GetMultipartInfo(ctx, bucket, object, uploadID, opts)
+	for _, pool := range z.serverPools {
+		mi, err := pool.GetMultipartInfo(ctx, bucket, object, uploadID, opts)
 		if err == nil {
 			return mi, nil
 		}
 		switch err.(type) {
 		case InvalidUploadID:
-			// upload id not found, continue to the next zone.
+			// upload id not found, continue to the next pool.
 			continue
 		}
 		// any other unhandled error return right here.
@@ -897,10 +897,10 @@ func (z *erasureServerPools) ListObjectParts(ctx context.Context, bucket, object
 	if z.SingleZone() {
 		return z.serverPools[0].ListObjectParts(ctx, bucket, object, uploadID, partNumberMarker, maxParts, opts)
 	}
-	for _, zone := range z.serverPools {
-		_, err := zone.GetMultipartInfo(ctx, bucket, object, uploadID, opts)
+	for _, pool := range z.serverPools {
+		_, err := pool.GetMultipartInfo(ctx, bucket, object, uploadID, opts)
 		if err == nil {
-			return zone.ListObjectParts(ctx, bucket, object, uploadID, partNumberMarker, maxParts, opts)
+			return pool.ListObjectParts(ctx, bucket, object, uploadID, partNumberMarker, maxParts, opts)
 		}
 		switch err.(type) {
 		case InvalidUploadID:
@@ -925,14 +925,14 @@ func (z *erasureServerPools) AbortMultipartUpload(ctx context.Context, bucket, o
 		return z.serverPools[0].AbortMultipartUpload(ctx, bucket, object, uploadID, opts)
 	}
 
-	for _, zone := range z.serverPools {
-		_, err := zone.GetMultipartInfo(ctx, bucket, object, uploadID, opts)
+	for _, pool := range z.serverPools {
+		_, err := pool.GetMultipartInfo(ctx, bucket, object, uploadID, opts)
 		if err == nil {
-			return zone.AbortMultipartUpload(ctx, bucket, object, uploadID, opts)
+			return pool.AbortMultipartUpload(ctx, bucket, object, uploadID, opts)
 		}
 		switch err.(type) {
 		case InvalidUploadID:
-			// upload id not found move to next zone
+			// upload id not found move to next pool
 			continue
 		}
 		return err
@@ -955,17 +955,17 @@ func (z *erasureServerPools) CompleteMultipartUpload(ctx context.Context, bucket
 	}
 
 	// Purge any existing object.
-	for _, zone := range z.serverPools {
-		zone.DeleteObject(ctx, bucket, object, opts)
+	for _, pool := range z.serverPools {
+		pool.DeleteObject(ctx, bucket, object, opts)
 	}
 
-	for _, zone := range z.serverPools {
-		result, err := zone.ListMultipartUploads(ctx, bucket, object, "", "", "", maxUploadsList)
+	for _, pool := range z.serverPools {
+		result, err := pool.ListMultipartUploads(ctx, bucket, object, "", "", "", maxUploadsList)
 		if err != nil {
 			return objInfo, err
 		}
 		if result.Lookup(uploadID) {
-			return zone.CompleteMultipartUpload(ctx, bucket, object, uploadID, uploadedParts, opts)
+			return pool.CompleteMultipartUpload(ctx, bucket, object, uploadID, uploadedParts, opts)
 		}
 	}
 	return objInfo, InvalidUploadID{
@@ -988,8 +988,8 @@ func (z *erasureServerPools) GetBucketInfo(ctx context.Context, bucket string) (
 		}
 		return bucketInfo, nil
 	}
-	for _, zone := range z.serverPools {
-		bucketInfo, err = zone.GetBucketInfo(ctx, bucket)
+	for _, pool := range z.serverPools {
+		bucketInfo, err = pool.GetBucketInfo(ctx, bucket)
 		if err != nil {
 			if isErrBucketNotFound(err) {
 				continue
@@ -1114,8 +1114,8 @@ func (z *erasureServerPools) ListBuckets(ctx context.Context) (buckets []BucketI
 	if z.SingleZone() {
 		buckets, err = z.serverPools[0].ListBuckets(ctx)
 	} else {
-		for _, zone := range z.serverPools {
-			buckets, err = zone.ListBuckets(ctx)
+		for _, pool := range z.serverPools {
+			buckets, err = pool.ListBuckets(ctx)
 			if err != nil {
 				logger.LogIf(ctx, err)
 				continue
@@ -1149,8 +1149,8 @@ func (z *erasureServerPools) HealFormat(ctx context.Context, dryRun bool) (madmi
 	}
 
 	var countNoHeal int
-	for _, zone := range z.serverPools {
-		result, err := zone.HealFormat(ctx, dryRun)
+	for _, pool := range z.serverPools {
+		result, err := pool.HealFormat(ctx, dryRun)
 		if err != nil && !errors.Is(err, errNoHealRequired) {
 			logger.LogIf(ctx, err)
 			continue
@@ -1183,8 +1183,8 @@ func (z *erasureServerPools) HealBucket(ctx context.Context, bucket string, opts
 	// Attempt heal on the bucket metadata, ignore any failures
 	_, _ = z.HealObject(ctx, minioMetaBucket, pathJoin(bucketConfigPrefix, bucket, bucketMetadataFile), "", opts)
 
-	for _, zone := range z.serverPools {
-		result, err := zone.HealBucket(ctx, bucket, opts)
+	for _, pool := range z.serverPools {
+		result, err := pool.HealBucket(ctx, bucket, opts)
 		if err != nil {
 			switch err.(type) {
 			case BucketNotFound:
@@ -1344,8 +1344,8 @@ func (z *erasureServerPools) HealObject(ctx context.Context, bucket, object, ver
 		defer lk.RUnlock()
 	}
 
-	for _, zone := range z.serverPools {
-		result, err := zone.HealObject(ctx, bucket, object, versionID, opts)
+	for _, pool := range z.serverPools {
+		result, err := pool.HealObject(ctx, bucket, object, versionID, opts)
 		if err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
 				continue
@@ -1374,12 +1374,12 @@ func (z *erasureServerPools) GetMetrics(ctx context.Context) (*Metrics, error) {
 }
 
 func (z *erasureServerPools) getZoneAndSet(id string) (int, int, error) {
-	for zoneIdx := range z.serverPools {
-		format := z.serverPools[zoneIdx].format
+	for poolIdx := range z.serverPools {
+		format := z.serverPools[poolIdx].format
 		for setIdx, set := range format.Erasure.Sets {
 			for _, diskID := range set {
 				if diskID == id {
-					return zoneIdx, setIdx, nil
+					return poolIdx, setIdx, nil
 				}
 			}
 		}
@@ -1419,12 +1419,12 @@ func (z *erasureServerPools) Health(ctx context.Context, opts HealthOptions) Hea
 
 	for _, localDiskIDs := range diskIDs {
 		for _, id := range localDiskIDs {
-			zoneIdx, setIdx, err := z.getZoneAndSet(id)
+			poolIdx, setIdx, err := z.getZoneAndSet(id)
 			if err != nil {
 				logger.LogIf(ctx, err)
 				continue
 			}
-			erasureSetUpCount[zoneIdx][setIdx]++
+			erasureSetUpCount[poolIdx][setIdx]++
 		}
 	}
 
@@ -1461,16 +1461,16 @@ func (z *erasureServerPools) Health(ctx context.Context, opts HealthOptions) Hea
 		}
 	}
 
-	for zoneIdx := range erasureSetUpCount {
-		for setIdx := range erasureSetUpCount[zoneIdx] {
-			if erasureSetUpCount[zoneIdx][setIdx] < writeQuorum {
+	for poolIdx := range erasureSetUpCount {
+		for setIdx := range erasureSetUpCount[poolIdx] {
+			if erasureSetUpCount[poolIdx][setIdx] < writeQuorum {
 				logger.LogIf(logger.SetReqInfo(ctx, reqInfo),
-					fmt.Errorf("Write quorum may be lost on zone: %d, set: %d, expected write quorum: %d",
-						zoneIdx, setIdx, writeQuorum))
+					fmt.Errorf("Write quorum may be lost on pool: %d, set: %d, expected write quorum: %d",
+						poolIdx, setIdx, writeQuorum))
 				return HealthResult{
 					Healthy:       false,
 					HealingDrives: len(aggHealStateResult.HealDisks),
-					ZoneID:        zoneIdx,
+					ZoneID:        poolIdx,
 					SetID:         setIdx,
 					WriteQuorum:   writeQuorum,
 				}
@@ -1501,8 +1501,8 @@ func (z *erasureServerPools) PutObjectTags(ctx context.Context, bucket, object s
 		return z.serverPools[0].PutObjectTags(ctx, bucket, object, tags, opts)
 	}
 
-	for _, zone := range z.serverPools {
-		err := zone.PutObjectTags(ctx, bucket, object, tags, opts)
+	for _, pool := range z.serverPools {
+		err := pool.PutObjectTags(ctx, bucket, object, tags, opts)
 		if err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
 				continue
@@ -1530,8 +1530,8 @@ func (z *erasureServerPools) DeleteObjectTags(ctx context.Context, bucket, objec
 	if z.SingleZone() {
 		return z.serverPools[0].DeleteObjectTags(ctx, bucket, object, opts)
 	}
-	for _, zone := range z.serverPools {
-		err := zone.DeleteObjectTags(ctx, bucket, object, opts)
+	for _, pool := range z.serverPools {
+		err := pool.DeleteObjectTags(ctx, bucket, object, opts)
 		if err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
 				continue
@@ -1559,8 +1559,8 @@ func (z *erasureServerPools) GetObjectTags(ctx context.Context, bucket, object s
 	if z.SingleZone() {
 		return z.serverPools[0].GetObjectTags(ctx, bucket, object, opts)
 	}
-	for _, zone := range z.serverPools {
-		tags, err := zone.GetObjectTags(ctx, bucket, object, opts)
+	for _, pool := range z.serverPools {
+		tags, err := pool.GetObjectTags(ctx, bucket, object, opts)
 		if err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
 				continue

cmd/metacache-server-pool.go

@@ -149,8 +149,8 @@ func (z *erasureServerPools) listPath(ctx context.Context, o listPathOptions) (e
 	allAtEOF := true
 	mu.Lock()
 	// Ask all sets and merge entries.
-	for _, zone := range z.serverPools {
-		for _, set := range zone.sets {
+	for _, pool := range z.serverPools {
+		for _, set := range pool.sets {
 			wg.Add(1)
 			go func(i int, set *erasureObjects) {
 				defer wg.Done()

cmd/peer-rest-server.go

@@ -672,8 +672,8 @@ func (s *peerRESTServer) PutBucketNotificationHandler(w http.ResponseWriter, r *
 func getLocalDiskIDs(z *erasureServerPools) []string {
 	var ids []string
 
-	for zoneIdx := range z.serverPools {
-		for _, set := range z.serverPools[zoneIdx].sets {
+	for poolIdx := range z.serverPools {
+		for _, set := range z.serverPools[poolIdx].sets {
 			disks := set.getDisks()
 			for _, disk := range disks {
 				if disk == nil {

cmd/prepare-storage.go

@@ -228,7 +228,7 @@ func IsServerResolvable(endpoint Endpoint) error {
 // connect to list of endpoints and load all Erasure disk formats, validate the formats are correct
 // and are in quorum, if no formats are found attempt to initialize all of them for the first
 // time. additionally make sure to close all the disks used in this attempt.
-func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints, zoneCount, setCount, setDriveCount int, deploymentID string) (storageDisks []StorageAPI, format *formatErasureV3, err error) {
+func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints, poolCount, setCount, setDriveCount int, deploymentID string) (storageDisks []StorageAPI, format *formatErasureV3, err error) {
 	// Initialize all storage disks
 	storageDisks, errs := initStorageDisksWithErrors(endpoints)
 
@@ -272,8 +272,8 @@ func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints,
 
 	// All disks report unformatted we should initialized everyone.
 	if shouldInitErasureDisks(sErrs) && firstDisk {
-		logger.Info("Formatting %s zone, %v set(s), %v drives per set.",
-			humanize.Ordinal(zoneCount), setCount, setDriveCount)
+		logger.Info("Formatting %s pool, %v set(s), %v drives per set.",
+			humanize.Ordinal(poolCount), setCount, setDriveCount)
 
 		// Initialize erasure code format on disks
 		format, err = initFormatErasure(GlobalContext, storageDisks, setCount, setDriveCount, "", deploymentID, sErrs)
@@ -345,7 +345,7 @@ func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints,
 }
 
 // Format disks before initialization of object layer.
-func waitForFormatErasure(firstDisk bool, endpoints Endpoints, zoneCount, setCount, setDriveCount int, deploymentID string) ([]StorageAPI, *formatErasureV3, error) {
+func waitForFormatErasure(firstDisk bool, endpoints Endpoints, poolCount, setCount, setDriveCount int, deploymentID string) ([]StorageAPI, *formatErasureV3, error) {
 	if len(endpoints) == 0 || setCount == 0 || setDriveCount == 0 {
 		return nil, nil, errInvalidArgument
 	}
@@ -372,7 +372,7 @@ func waitForFormatErasure(firstDisk bool, endpoints Endpoints, zoneCount, setCou
 	for {
 		select {
 		case <-ticker.C:
-			storageDisks, format, err := connectLoadInitFormats(tries, firstDisk, endpoints, zoneCount, setCount, setDriveCount, deploymentID)
+			storageDisks, format, err := connectLoadInitFormats(tries, firstDisk, endpoints, poolCount, setCount, setDriveCount, deploymentID)
 			if err != nil {
 				tries++
 				switch err {

docs/distributed/DESIGN.md

@@ -94,7 +94,7 @@ Input for the key is the object name specified in `PutObject()`, returns a uniqu
 
 - MinIO does erasure coding at the object level not at the volume level, unlike other object storage vendors. This allows applications to choose different storage class by setting `x-amz-storage-class=STANDARD/REDUCED_REDUNDANCY` for each object uploads so effectively utilizing the capacity of the cluster. Additionally these can also be enforced using IAM policies to make sure the client uploads with correct HTTP headers.
 
-- MinIO also supports expansion of existing clusters in server pools. Each zone is a self contained entity with same SLA's (read/write quorum) for each object as original cluster. By using the existing namespace for lookup validation MinIO ensures conflicting objects are not created. When no such object exists then MinIO simply uses the least used zone.
+- MinIO also supports expansion of existing clusters in server pools. Each pool is a self contained entity with same SLA's (read/write quorum) for each object as original cluster. By using the existing namespace for lookup validation MinIO ensures conflicting objects are not created. When no such object exists then MinIO simply uses the least used pool.
 
 __There are no limits on how many server pools can be combined__
 
@@ -104,23 +104,23 @@ minio server http://host{1...32}/export{1...32} http://host{5...6}/export{1...8}
 
 In above example there are two server pools
 
-- 32 * 32 = 1024 drives zone1
-- 2 * 8 = 16 drives zone2
+- 32 * 32 = 1024 drives pool1
+- 2 * 8 = 16 drives pool2
 
-> Notice the requirement of common SLA here original cluster had 1024 drives with 16 drives per erasure set, second zone is expected to have a minimum of 16 drives to match the original cluster SLA or it should be in multiples of 16.
+> Notice the requirement of common SLA here original cluster had 1024 drives with 16 drives per erasure set, second pool is expected to have a minimum of 16 drives to match the original cluster SLA or it should be in multiples of 16.
 
-MinIO places new objects in server pools based on proportionate free space, per zone. Following pseudo code demonstrates this behavior.
+MinIO places new objects in server pools based on proportionate free space, per pool. Following pseudo code demonstrates this behavior.
 ```go
-func getAvailableZoneIdx(ctx context.Context) int {
+func getAvailablePoolIdx(ctx context.Context) int {
         serverPools := z.getServerPoolsAvailableSpace(ctx)
         total := serverPools.TotalAvailable()
         // choose when we reach this many
         choose := rand.Uint64() % total
         atTotal := uint64(0)
-        for _, zone := range serverPools {
-                atTotal += zone.Available
-                if atTotal > choose && zone.Available > 0 {
-                        return zone.Index
+        for _, pool := range serverPools {
+                atTotal += pool.Available
+                if atTotal > choose && pool.Available > 0 {
+                        return pool.Index
                 }
         }
         // Should not happen, but print values just in case.

docs/distributed/README.md

@@ -77,10 +77,10 @@ For example:
 minio server http://host{1...4}/export{1...16} http://host{5...12}/export{1...16}
 ```
 
-Now the server has expanded total storage by _(newly_added_servers\*m)_ more disks, taking the total count to _(existing_servers\*m)+(newly_added_servers\*m)_ disks. New object upload requests automatically start using the least used cluster. This expansion strategy works endlessly, so you can perpetually expand your clusters as needed.  When you restart, it is immediate and non-disruptive to the applications. Each group of servers in the command-line is called a zone. There are 2 server pools in this example. New objects are placed in server pools in proportion to the amount of free space in each zone. Within each zone, the location of the erasure-set of drives is determined based on a deterministic hashing algorithm.
+Now the server has expanded total storage by _(newly_added_servers\*m)_ more disks, taking the total count to _(existing_servers\*m)+(newly_added_servers\*m)_ disks. New object upload requests automatically start using the least used cluster. This expansion strategy works endlessly, so you can perpetually expand your clusters as needed.  When you restart, it is immediate and non-disruptive to the applications. Each group of servers in the command-line is called a pool. There are 2 server pools in this example. New objects are placed in server pools in proportion to the amount of free space in each pool. Within each pool, the location of the erasure-set of drives is determined based on a deterministic hashing algorithm.
 
-> __NOTE:__ __Each zone you add must have the same erasure coding set size as the original zone, so the same data redundancy SLA is maintained.__
-> For example, if your first zone was 8 drives, you could add further server pools of 16, 32 or 1024 drives each. All you have to make sure is deployment SLA is multiples of original data redundancy SLA i.e 8.
+> __NOTE:__ __Each pool you add must have the same erasure coding set size as the original pool, so the same data redundancy SLA is maintained.__
+> For example, if your first pool was 8 drives, you could add further server pools of 16, 32 or 1024 drives each. All you have to make sure is deployment SLA is multiples of original data redundancy SLA i.e 8.
 
 ## 3. Test your setup
 To test this setup, access the MinIO server via browser or [`mc`](https://docs.min.io/docs/minio-client-quickstart-guide).

docs/zh_CN/distributed/DESIGN.md

@@ -104,24 +104,24 @@ minio server http://host{1...32}/export{1...32} http://host{5...6}/export{1...8}
 
 以上示例有两个区域
 
-- 32 * 32 = 1024 drives zone1
-- 2 * 8 = 16 drives zone2
+- 32 * 32 = 1024 drives pool1
+- 2 * 8 = 16 drives pool2
 
 > 注意这里对通用SLA的要求，原来的集群有1024个磁盘，每个纠删集合有16个磁盘，第二个区域至少要有16个磁盘才能符合原来集群的SLA，或者应该是16的倍数。
 
 
 MinIO根据每个区域的可用空间比例将新对象放置在区域中。以下伪代码演示了此行为。
 ```go
-func getAvailableZoneIdx(ctx context.Context) int {
+func getAvailablePoolIdx(ctx context.Context) int {
         serverPools := z.getServerPoolsAvailableSpace(ctx)
         total := serverPools.TotalAvailable()
         // choose when we reach this many
         choose := rand.Uint64() % total
         atTotal := uint64(0)
-        for _, zone := range serverPools {
-                atTotal += zone.Available
-                if atTotal > choose && zone.Available > 0 {
-                        return zone.Index
+        for _, pool := range serverPools {
+                atTotal += pool.Available
+                if atTotal > choose && pool.Available > 0 {
+                        return pool.Index
                 }
         }
         // Should not happen, but print values just in case.