ceph: add CR flag to tune slow device class for OSD on PVC in the Cloud #4308
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gp2 devices present themselves as SSDs, but have much more variable performance. Ceph attempts to adjust some settings based on the drive type, HDD/SSD In this case client I/O can be impacted too much by assuming gp2 devices are like other SSDs (an example is https://bugzilla.redhat.com/show_bug.cgi?id=1765923#c6) In order to prevent this, rook can set the following for OSDs if the new CR setting `tuneSlowDeviceClass` is set to `true`: ``` osd_recovery_sleep = 0.1 osd_snap_trim_sleep = 2 osd_delete_sleep = 2 ``` Closes: rook#4298 and https://bugzilla.redhat.com/show_bug.cgi?id=1771047 Signed-off-by: Sébastien Han <seb@redhat.com>
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Description of your changes:
gp2 devices present themselves as SSDs,
but have much more variable performance.
Ceph attempts to adjust some settings based on the drive type,
HDD/SSD
In this case client I/O can be impacted too much by assuming gp2 devices are like other SSDs
(an example is https://bugzilla.redhat.com/show_bug.cgi?id=1765923#c6)
In order to prevent this, rook can set the following for OSDs on gp2 devices:
Closes: #4298 and https://bugzilla.redhat.com/show_bug.cgi?id=1771047
Signed-off-by: Sébastien Han seb@redhat.com
Which issue is resolved by this Pull Request:
Resolves #4298
Checklist:
make codegen) has been run to update object specifications, if necessary.[test ceph]