Hi Eric, > -----Original Message----- > From: Eric Eastman [mailto:eric.eastman@xxxxxxxxxxxxxx] > Sent: 09 May 2016 19:21 > To: Nick Fisk <nick@xxxxxxxxxx> > Cc: Ceph Users <ceph-users@xxxxxxxxxxxxxx> > Subject: Re: CephFS + CTDB/Samba - MDS session timeout on > lockfile > > I am trying to do some similar testing with SAMBA and CTDB with the Ceph > file system. Are you using the vfs_ceph SAMBA module or are you kernel > mounting the Ceph file system? I'm using the kernel client. I couldn't find any up to date information on if the vfs plugin supported all the necessary bits and pieces. How is your testing coming along? I would be very interested in any findings you may have come across. Nick > > Thanks > Eric > > On Mon, May 9, 2016 at 9:31 AM, Nick Fisk <nick@xxxxxxxxxx> wrote: > > Hi All, > > > > I've been testing an active/active Samba cluster over CephFS, > > performance seems really good with small files compared to Gluster. > > Soft reboots work beautifully with little to no interruption in file > > access. However when I perform a hard shutdown/reboot of one of the > > samba nodes, the remaining node detects that the other Samba node has > > disappeared but then eventually bans itself. If I leave everything for > > around 5 minutes, CTDB unbans itself and then everything continues > running. > > > > From what I can work out it looks like as the MDS has a stale session > > from the powered down node, it won't let the remaining node access the > > CTDB lock file (which is also sitting the on the CephFS). CTDB > > meanwhile is hammering away trying to access the lock file, but it > > sees what it thinks is a split brain scenario because something still > > has a lock on the lockfile, and so bans itself. > > > > I'm guessing the solution is to either reduce the mds session timeout > > or increase the amount of time/retries for CTDB, but I'm not sure > > what's the best approach. Does anyone have any ideas? > > > > Nick > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@xxxxxxxxxxxxxx > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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