5 Jan
2021
5 Jan
'21
5:37 p.m.
On Tue, Jan 5, 2021 at 9:01 AM Wissem MIMOUNA
<wissem.mimouna(a)fiducialcloud.fr> wrote:
Hi ,
Thank you for your feedback . It seems the error related to the fstrim run once a week (
default ) .
Do you have object-map enabled? If not, the FS will gladly send huge
discard extents which, if you have a large volume, could result in
hundreds of thousands of ops to the cluster. That's a great way to
hang IO.
Do you have more information about the NBD/XFS memeory
pressure issues ?
See [1].
Thanks
-----Message d'origine-----
De : Jason Dillaman <jdillama(a)redhat.com>
Envoyé : mardi 5 janvier 2021 14:42
À : Wissem MIMOUNA <wissem.mimouna(a)fiducialcloud.fr>
Cc : ceph-users(a)ceph.io
Objet : Re: [ceph-users] Timeout ceph rbd-nbd mounted image
You can try using the "--timeout X" optional for "rbd-nbd" to
increase the timeout. Some kernels treat the default as infinity, but there were some
>=4.9 kernels that switched behavior and started defaulting to 30 seconds. There is
also known issues with attempting to place XFS file systems on top of NBD due to memory
pressure issues.
On Tue, Jan 5, 2021 at 4:36 AM Wissem MIMOUNA <wissem.mimouna(a)fiducialcloud.fr>
wrote:
[1] https://tracker.ceph.com/issues/40822
--
Jason
Hello ,
Looking for information about a timeout which occur once a week for a ceph rbd image
mounted on a machine using rbd-nbd (Linux Ubuntu machine).
The error found in 'dmseg' is below :
[798016.401469] block nbd0: Connection timed out [798016.401506] block
nbd0: shutting down sockets
Many Thanks
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--
Jason