Hi,
Thanks for the link.
I unset the nodown config option and things did seem to improve, although we
did still get a few reports from users about issues related filesystem (rbd)
access, even after that action was taken.
Thanks again,
Shain
> On Mar 13, 2017, at 2:43 AM, Alexandre DERUMIER wrote:
>
> Hi,
>
>>> Currently I have the. noout and nodown flags set while doing the
>>> maintenance work.
>
> you only need noout to avoid rebalancing
>
> see documentation:
> http://docs.ceph.com/docs/kraken/rados/troubleshooting/troubleshooting-osd/
> "STOPPING W/OUT REBALANCING".
>
>
> Your clients are hanging because of the no down flag
>
>
> See this blog for no-out, no-down flags experiements
>
> https://www.sebastien-han.fr/blog/2013/04/17/some-ceph-experiments/
>
> - Mail original -
> De: "Shain Miley"
> À: "ceph-users"
> Envoyé: Lundi 13 Mars 2017 04:58:08
> Objet: [ceph-users] noout, nodown and blocked requests
>
> Hello,
> One of the nodes in our 14 node cluster is offline and before I totally
> commit to fully removing the node from the cluster (there is a chance I can
> get the node back in working order in the next few days) I would like to run
> the cluster with that single node out for a few days.
>
> Currently I have the. noout and nodown flags set while doing the maintenance
> work.
>
> Some users are complaining about disconnects and other oddities when try to
> save and access files currently on the cluster.
>
> I am also seeing some blocked requests when viewing the cluster status (at
> this point I see 160 block requests spread over 15 to 20 osd’s).
>
> Currently I have a replication level of 3 on this pool and a min_size of 1.
>
> My question is this…is there a better method to use (other than using noout
> and nodown) in this scenario where I do not want data movement yet…but I do
> want the reads and writes to the cluster to to respond as normally as
> possible for the end users?
>
> Thanks in advance,
>
> Shain
>
>
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