So we have been testing this quite a bit, having the failure domain as partially available is ok for us but odd, since we don't know what will be down. Compared to a single MDS we know everything will be blocked.
It would be nice to have an option to have all IO blocked if it hits a degraded state until it recovers. Since you are unaware of other MDS state, seems like that would be tough to do.
I'll leave this as a feature request possibly in the future.
On Fri, May 18, 2018 at 3:15 PM Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
On Fri, May 18, 2018 at 11:56 AM Webert de Souza Lima <webert.boss@xxxxxxxxx> wrote:Hello,additionally: if rank 0 is lost, the whole FS stands still (no new
client can mount the fs; no existing client can change a directory, etc.).
my guess is that the root of a cephfs (/; which is always served by rank
0) is needed in order to do traversals/lookups of any directories on the
top-level (which then can be served by ranks 1-n).Could someone confirm if this is actually how it works? Thanks.Yes, although I'd expect that clients can keep doing work in directories they've already got opened (or in descendants of those). Perhaps I'm missing something about that, though...-Greg______________________________________________________________________________________________Regards,Webert LimaDevOps Engineer at MAV TecnologiaBelo Horizonte - BrasilIRC NICK - WebertRLZ
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