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