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Ceph performance

4 байта добавлено, 08:32, 24 июля 2019
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{{Box|[[File:Warning icon.svg|32px|link=]] {{red|WARNING!}} For those under a rock — fio write test is DESTRUCTIVE. Don’t dare to run it on disks which have important data… for example, OSD journals (I’ve seen such cases).}}
* Try to disable drive cache before testing: {{Cmd|hdparm -W 0 /dev/sdX}} (SATA drives), {{Cmd|1=sdparm --set WCE=0 /dev/sdX}} (SAS drives). This is usually ABSOLUTELY required for server SSDs like Micron 5100 or Seagate Nytro (see [[#Drive cache is slowing you down]]) as it increases random write iops ''more than by two magnitudes'' (from 288 iops to 18000 iops!). In some cases it may not improve anything, so try both options -W0 and -W1.
* Linear read: {{Cmd|1=fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4M -iodepth=32 -rw=read -runtime=60 -filename=/dev/sdX}}
* Linear write: {{Cmd|1=fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4M -iodepth=32 -rw=write -runtime=60 -filename=/dev/sdX}}