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minio/docs/deployment/kernel-tuning/disk-tuning.sh

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#!/bin/bash
## MinIO Cloud Storage, (C) 2017, 2018 MinIO, Inc.
##
## Licensed under the Apache License, Version 2.0 (the "License");
## you may not use this file except in compliance with the License.
## You may obtain a copy of the License at
##
## http://www.apache.org/licenses/LICENSE-2.0
##
## Unless required by applicable law or agreed to in writing, software
## distributed under the License is distributed on an "AS IS" BASIS,
## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
## See the License for the specific language governing permissions and
## limitations under the License.
# This script changes protected files, and must be run as root
for i in $(echo /sys/block/*/queue/iosched 2>/dev/null); do
iosched_dir=$(echo "${i}" | awk '/iosched/ {print $1}')
[ -z "${iosched_dir}" ] && {
continue
}
## Change each disk ioscheduler to be "deadline"
## Deadline dispatches I/Os in batches. A batch is a
## sequence of either read or write I/Os which are in
## increasing LBA order (the one-way elevator). After
## processing each batch, the I/O scheduler checks to
## see whether write requests have been starved for too
## long, and then decides whether to start a new batch
## of reads or writes
path=$(dirname "${iosched_dir}")
[ -f "${path}/scheduler" ] && {
echo "deadline" > "${path}/scheduler" 2>/dev/null || true
}
## This controls how many requests may be allocated
## in the block layer for read or write requests.
## Note that the total allocated number may be twice
## this amount, since it applies only to reads or
## writes (not the accumulate sum).
[ -f "${path}/nr_requests" ] && {
echo "256" > "${path}/nr_requests" 2>/dev/null || true
}
## This is the maximum number of kilobytes
## supported in a single data transfer at
## block layer.
[ -f "${path}/max_sectors_kb" ] && {
echo "1024" > "${path}/max_sectors_kb" 2>/dev/null || true
}
done