Re: Updating ceps client - what will happen to services like NFS on clients

[Götz Reinicke <goetz.reinicke@xxxxxxxxxxxxxxx>]

Hi Thanks David & David,

we don’t use the fuse code. And may be I was a bit unclear, but your feedback clears some other aspects in that context.

I did an update already on our OSD/MONs while a NFS Fileserver still had a rbd connected and was exporting files (Virtual disks for XEN server) online.

Now the question is, can I update the ceph packages on the NFS Fileserver while the export (and VM Images) are online? Or should I shutdown the VMs and unmount the NFS export …?

Lots of nuts and bolts, but I like to screw …. :)

Cheers . Götz

Am 25.09.2017 um 17:05 schrieb David Turner <drakonstein@xxxxxxxxx>:

It depends a bit on how you have the RBDs mapped.  If you're mapping them using krbd, then they don't need to be updated to use the new rbd-fuse or rbd-nbd code.  If you're using one of the latter, then you should schedule a time to restart the mounts so that they're mapped with the new Ceph version.

In general RBDs are not affected by upgrades as long as you don't take down too much of the cluster at once and are properly doing a rolling upgrade.

On Mon, Sep 25, 2017 at 8:07 AM David <dclistslinux@xxxxxxxxx> wrote:

Hi Götz

If you did a rolling upgrade, RBD clients shouldn't have experienced interrupted IO and therefor IO to NFS exports shouldn't have been affected. However, in the past when using kernel NFS over kernel RBD, I did have some lockups when OSDs went down in the cluster so that's something to watch out for.

On Mon, Sep 25, 2017 at 8:38 AM, Götz Reinicke <goetz.reinicke@xxxxxxxxxxxxxxx> wrote:

Hi,

I updated our ceph OSD/MON Nodes from 10.2.7 to 10.2.9 and everything looks good so far.

Now I was wondering (as I may have forgotten how this works) what will happen to a  NFS server which has the nfs shares on a ceph rbd ? Will the update interrupt any access to the NFS share or is it that smooth that e.g. clients accessing the NFS share will not notice?

Thanks for some lecture on managing ceph and regards . Götz

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