Re: 18.2.6 : OSD(s) experiencing slow operations in BlueStore

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Hi Michel,

This is not an issue. It's a new warning that can be adjusted or muted. Check this thread [1] and this part [2] of the Reef documentation about this new alert.
Came to Reef with PR #59466 [3].

Cheers,
Frédéric.

[1] https://www.spinics.net/lists/ceph-users/msg86131.html
[2] https://docs.ceph.com/en/latest/rados/operations/health-checks/#bluestore-slow-op-alert
[3] https://github.com/ceph/ceph/pull/59466

----- Le 2 Mai 25, à 9:44, Michel Jouvin michel.jouvin@xxxxxxxxxxxxxxx a écrit :

> Hi,
> 
> Since our upgrade to 18.2.6 2 days ago, our cluster is reporting the
> warning "1 OSD(s) experiencing slow operations in BlueStore":
> 
> [root@dig-osd4 bluestore-slow-ops]# ceph health detail
> HEALTH_WARN 1 OSD(s) experiencing slow operations in BlueStore
> [WRN] BLUESTORE_SLOW_OP_ALERT: 1 OSD(s) experiencing slow operations in
> BlueStore
>      osd.247 observed slow operation indications in BlueStore
> 
> I have never seen this warning before so I've the feeling it is somehow
> related to the upgrade and it doesn't seem related to the regression
> mentioned in another thread (that should result in an OSD crash).
> Googling quickly, I found this reported on 19.2.1 with SSD where in my
> case it is an HDD. I don't know if the workaround mentioned in the issue
> (bdev_xxx_discard=true) also applies to 18.2.6...
> 
> Did somebody saw this in 18.2.x? Any recommandation? Our plan was,
> according to best practicies described recently in another thread to
> move from 18.2.2 to 18.2.6 and then from 18.2.6 to 19.2.2... Will 19.2.2
> clear this issue (at the risk of others as it is probably not widely used)?
> 
> Best regards,
> 
> Michel
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