Hello Anthony
I am directly measuring on all rbd images from ceph node using rbd iostat.
Any parameter to improve images ?
Regards
Dev
On Fri, 1 Aug 2025 at 8:05 PM, Anthony D'Atri <anthony.datri@xxxxxxxxx>
wrote:
> How are you measuring this?
>
> VMs do add an emulation cost on devices.
>
>
> On Aug 1, 2025, at 11:03 PM, Devender Singh <devender@xxxxxxxxxx> wrote:
>
> No all’s are ssd and none
>
> Regards
> Dev
>
>
> On Fri, 1 Aug 2025 at 7:58 PM, Anthony D'Atri <anthony.datri@xxxxxxxxx>
> wrote:
>
>> What is this the output of? Is this reading from HDDs?
>>
>> > On Aug 1, 2025, at 9:01 PM, Devender Singh <devender@xxxxxxxxxx> wrote:
>> >
>> > Hello All
>> >
>> > Using R3 pool with images running ubuntu vms.
>> >
>> > Having three nodes…
>> >
>> > I have default settings for ms_asyc threads to 3 and rbd_op_thread to 1
>> > How to improve below latency…mainly write....
>> >
>> > # sed 's/^.\{60\}//' a
>> > WR RD WR_BYTES RD_BYTES WR_LAT RD_LAT
>> > 50/s 0/s 275 KiB/s 0 B/s 17.36 ms 0.00 ns
>> > 45/s 4/s 230 KiB/s 56 KiB/s 66.02 ms 6.90 ms
>> > 25/s 0/s 146 KiB/s 0 B/s 68.52 ms 0.00 ns
>> > 24/s 0/s 548 KiB/s 0 B/s 22.49 ms 0.00 ns
>> > 22/s 0/s 114 KiB/s 0 B/s 20.85 ms 0.00 ns
>> > 18/s 0/s 204 KiB/s 0 B/s 48.31 ms 0.00 ns
>> > 17/s 0/s 182 KiB/s 0 B/s 10.00 ms 0.00 ns
>> > 15/s 4/s 25 MiB/s 17 KiB/s 254.61 ms 17.42 ms
>> > 12/s 0/s 268 KiB/s 0 B/s 29.67 ms 0.00 ns
>> > 12/s 2/s 13 MiB/s 8.8 KiB/s 147.05 ms 2.30 ms
>> > 11/s 0/s 77 KiB/s 0 B/s 50.42 ms 0.00 ns
>> > 11/s 0/s 74 KiB/s 0 B/s 35.54 ms 0.00 ns
>> > 10/s 0/s 101 KiB/s 0 B/s 80.83 ms 0.00 ns
>> > 9/s 0/s 65 KiB/s 0 B/s 24.81 ms 0.00 ns
>> > 7/s 0/s 37 KiB/s 0 B/s 59.11 ms 0.00 ns
>> > 7/s 0/s 33 KiB/s 0 B/s 43.95 ms 0.00 ns
>> > 6/s 8/s 31 KiB/s 34 KiB/s 131.78 ms 127.46 us
>> > 4/s 0/s 18 KiB/s 0 B/s 56.90 ms 0.00 ns
>> > 4/s 0/s 23 KiB/s 0 B/s 74.13 ms 0.00 ns
>> > 3/s 0/s 18 KiB/s 0 B/s 38.25 ms 0.00 ns
>> > 2/s 0/s 10 KiB/s 0 B/s 26.28 ms 0.00 ns
>> > 2/s 0/s 11 KiB/s 0 B/s 49.80 ms 0.00 ns
>> > 1/s 0/s 90 KiB/s 0 B/s 43.02 ms 0.00 ns
>> > 1/s 0/s 8.8 KiB/s 0 B/s 24.99 ms 0.00 ns
>> > 1/s 0/s 10 KiB/s 0 B/s 102.38 ms 0.00 ns
>> > 1/s 0/s 15 KiB/s 0 B/s 57.23 ms 0.00 ns
>> > 0/s 0/s 7.2 KiB/s 0 B/s 149.90 ms 0.00 ns
>> > 0/s 0/s 4 KiB/s 0 B/s 1.58 ms 0.00 ns
>> > 0/s 0/s 3.2 KiB/s 0 B/s 1.02 ms 0.00 ns
>> > 0/s 0/s 819 B/s 0 B/s 40.45 ms 0.00 ns
>> >
>> > Regards
>> > Dev
>> >
>> >
>> >
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>>
>>
>
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