Hi All,
I have changed my I/O scheduler to none and here are the results so far:
Before (mq-deadline):Adding a disk to VM (initial creation) START:
2019-03-17 16:34:46.709Adding a disk to VM (initial creation) COMPLETED:
2019-03-17 16:45:17.996
After (none):Adding a disk to VM (initial creation) START: 2019-03-18
08:52:02.xxxAdding a disk to VM (initial creation) COMPLETED: 2019-03-18
08:52:20.xxx
Of course the results are inconclusive, as I have tested only once - but I feel
the engine more responsive.
Best Regards,Strahil Nikolov
В неделя, 17 март 2019 г., 18:30:23 ч. Гринуич+2, Strahil
<[email protected]> написа:
Dear All,
I have just noticed that my Hosted Engine has a strange I/O scheduler:
Last login: Sun Mar 17 18:14:26 2019 from 192.168.1.43
[root@engine ~]# cat /sys/block/vda/queue/scheduler
[mq-deadline] kyber none
[root@engine ~]#
Based on my experience anything than noop/none is useless and performance
degrading for a VM.
Is there any reason that we have this scheduler ?
It is quite pointless to process (and delay) the I/O in the VM and then
process (and again delay) on Host Level .
If there is no reason to keep the deadline, I will open a bug about it.
Best Regards,
Strahil Nikolov
Dear All,
I have just noticed that my Hosted Engine has a strange I/O scheduler:
Last login: Sun Mar 17 18:14:26 2019 from 192.168.1.43
[root@engine ~]# cat /sys/block/vda/queue/scheduler
[mq-deadline] kyber none
[root@engine ~]#
Based on my experience anything than noop/none is useless and performance
degrading for a VM.
Is there any reason that we have this scheduler ?
It is quite pointless to process (and delay) the I/O in the VM and then
process (and again delay) on Host Level .
If there is no reason to keep the deadline, I will open a bug about it.
Best Regards,
Strahil Nikolov _______________________________________________
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