Re: The effect of changing an osd's class

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On 2024/11/14 11:44, Joachim Kraftmayer wrote:
I know the similar behaviour when mclock is active.

For osd.0 I see:

osd.0         basic     osd_mclock_max_capacity_iops_ssd 14305.161403

I'm unfamiliar with mclock.  Can one tune that to improve the situation?

Roland




Joachim


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Roland Giesler <roland@xxxxxxxxxxxxxx> schrieb am Do., 14. Nov. 2024, 05:40:

On 2024/11/13 21:05, Anthony D'Atri wrote:
I would think that there was some initial data movement and that it all
went back when you reverted.  I would not expect a mess.

    data:
      volumes: 1/1 healthy
      pools:   7 pools, 1586 pgs
      objects: 5.79M objects, 12 TiB
      usage:   24 TiB used, 26 TiB / 50 TiB avail
      pgs:     4161/11720662 objects misplaced (0.036%)
               1463 active+clean
               113  active+clean+remapped
               9    active+clean+scrubbing+deep+repair
               1    active+clean+scrubbing+deep

I have 113 active+clean+remapped pg's that just stay like that. If I try
to out the this osd to stop it, the clsuter also never settles.  So then
if I try to stop it in the GUI is tells me 73 pg's are still on the OSD...

Can I force those pg's away from the osd?

On Nov 13, 2024, at 12:48 PM, Roland Giesler <roland@xxxxxxxxxxxxxx>
wrote:
I created a new osd class and changed the class of an osd to the new
one without taking the osd out and stopping it first.  The new class also
has a crush rule and a pool created for it.
When I realised my mistake, I reverted to what I had before. However, I
suspect that I now have a mess on that osd.
What happened when I did this?

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