Hi All

We have a nicely functional NVMe cluster running – but in the process of expanding it we have encountered slow_ops 

The drill was:

1. Maintaince mode
2. Ceph orch osd add
3. Change weights to 1
4. Disable maintaince mode.

Somethings goes wrong around 3 – where slowops begins to kick in – but restarting the OSD’s underneath can make it go away – tested twice.

In one situation the 2) step failed to bring up the OSD – causing the entire process to work 100% correctly. Thus changing weight from 7.68 to 1

In above process on live OSD seem to be the issue.

It is actually a flaw that we managed to get the entire cluster created with weight 1 instead of 7.68 in the first place thus:

1. Can we bulk change weights on all existing OSD’s without huge data movement? If so – how?
2. Can we ceph orch add – but with a specific initial weight?

Thanks.

Best regards,

Jesper Agerbo Krogh

Director Digitalization
Digitalization

Topsoe A/S

Haldor Topsøes Allé 1

2800 Kgs. Lyngby

Denmark

Phone (direct): 27773240

     

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