Do not rely on quorum for StorageInfo() (#8557)

StorageInfo() call is supposed to give each
server/disk information independently, rely
on this appropriately so that `mc admin info server`
gets correct information all the time.

cmd/notification.go

@@ -55,6 +55,9 @@ type NotificationSys struct {
 // GetARNList - returns available ARNs.
 func (sys *NotificationSys) GetARNList() []string {
 	arns := []string{}
+	if sys == nil {
+		return arns
+	}
 	region := globalServerRegion
 	for _, targetID := range sys.targetList.List() {
 		// httpclient target is part of ListenBucketNotification
@@ -439,8 +442,9 @@ func (sys *NotificationSys) ServerInfo(ctx context.Context) []ServerInfo {
 				info, err := sys.peerClients[index].ServerInfo()
 				if err != nil {
 					serverInfo[index].Error = err.Error()
+				} else {
+					serverInfo[index].Data = &info
 				}
-				serverInfo[index].Data = &info
 				// Last iteration log the error.
 				if i == 2 {
 					return err

cmd/xl-sets.go

@@ -385,20 +385,17 @@ func (s *xlSets) StorageInfo(ctx context.Context) StorageInfo {
 
 	errs := combineStorageErrors(dErrs, sErrs)
 	drivesInfo := formatsToDrivesInfo(s.endpoints, formats, errs)
-	refFormat, err := getFormatXLInQuorum(formats)
-	if err != nil {
-		// Ignore errors here, since this call cannot do anything at
-		// this point. too many disks are down already.
-		return storageInfo
-	}
 
 	// fill all the available/online endpoints
-	for _, drive := range drivesInfo {
+	for k, drive := range drivesInfo {
 		if drive.UUID == "" {
 			continue
 		}
-		for i := range refFormat.XL.Sets {
-			for j, driveUUID := range refFormat.XL.Sets[i] {
+		if formats[k] == nil {
+			continue
+		}
+		for i := range formats[k].XL.Sets {
+			for j, driveUUID := range formats[k].XL.Sets[i] {
 				if driveUUID == drive.UUID {
 					storageInfo.Backend.Sets[i][j] = drive
 				}