.
Best regards,
=
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
From: Etienne Menguy
Sent: 22 September 2021 12:17:39
To: ceph-users
Subject: [ceph-users] Re: Why set osd flag to noout during upgrade ?
Hello,
>From my experience
Indeed. In a large enough cluster, even a few minutes of extra
backfill/recovery per OSD adds up. Say you have 100 OSD nodes, and just 3
minutes of unnecessary backfill per. That prolongs your upgrade by 5 hours.
> Yeah you don't want to deal with backfilling while the cluster is
>
Yeah you don't want to deal with backfilling while the cluster is
upgrading. At best it can delay the upgrade, at worst mixed version
backfilling has (rarely) caused issues in the past.
We additionally `set noin` and disable the balancer: `ceph balancer off`.
The former prevents broken osds from
Hello,
From my experience, I see three reasons :
- You don’t want to recover data if you already have them on a down OSD,
rebalancing can have a big impact on performance
- If upgrade/maintenance goes wrong you will want to focus on this issue and
not have to deal with things done by Ceph
