Hi!
Interesting. Didn't know that.
We are running cfq on the OSDs, and added to ceph.conf:
[osd]
osd_disk_thread_ioprio_class = idle
osd_disk_thread_ioprio_priority = 7
Since we recently switched from HDD to SSD OSDs, I guess we should also
change from CFQ to noop.
Is there also something we need to change accordingly in ceph.conf?
We simply added to rc.local:
echo cfq > /sys/block/sda/queue/scheduler
....
echo cfq > /sys/block/sdf/queue/scheduler
Anything else to do, besides changing cfq to noop in the above..?
Thanks for the tip!
MJ
On 2/2/21 8:44 AM, Wido den Hollander wrote:
On 28/01/2021 18:09, Andrei Mikhailovsky wrote:
Hello everyone,
Could some one please let me know what is the recommended modern
kernel disk scheduler that should be used for SSD and HDD osds? The
information in the manuals is pretty dated and refer to the schedulers
which have been deprecated from the recent kernels.
Afaik noop is usually the one use for Flash devices.
CFQ is used on HDDs most of the time as it allows for better
scheduling/QoS.
Wido
Thanks
Andrei
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