If there was a network blip and a client was having trouble reconnecting, do you think reducing the ranks to 1 would allow them to connect? At which point the ranks could be increased again. Or is it a matter of the client kernel panicking so any kind of reconnection won't work? Thanks ---------------- Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 On Fri, May 1, 2020 at 7:37 PM Robert LeBlanc <robert@xxxxxxxxxxxxx> wrote: > Thanks guys. We are so close to the edge that we may just take that > chance, usually the only reason an active client has to reconnect is > because we have to bounce the MDS because it's overwhelmed. > ---------------- > Robert LeBlanc > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > > > On Fri, May 1, 2020 at 4:00 AM Paul Emmerich <paul.emmerich@xxxxxxxx> > wrote: > >> I've seen issues with clients reconnects on older kernels, yeah. They >> sometimes get stuck after a network failure >> >> Paul >> >> -- >> Paul Emmerich >> >> Looking for help with your Ceph cluster? Contact us at https://croit.io >> >> croit GmbH >> Freseniusstr. 31h >> 81247 München >> www.croit.io >> Tel: +49 89 1896585 90 >> >> >> On Thu, Apr 30, 2020 at 10:19 PM Gregory Farnum <gfarnum@xxxxxxxxxx> >> wrote: >> >>> On Tue, Apr 28, 2020 at 11:52 AM Robert LeBlanc <robert@xxxxxxxxxxxxx> >>> wrote: >>> > >>> > In the Nautilus manual it recommends >= 4.14 kernel for multiple active >>> > MDSes. What are the potential issues for running the 4.4 kernel with >>> > multiple MDSes? We are in the process of upgrading the clients, but at >>> > times overrun the capacity of a single MDS server. >>> >>> I don't think this is documented specifically; you'd have to go >>> through the git logs. Talked with the team and 4.14 was the upstream >>> kernel when we marked multi-MDS as stable, with the general stream of >>> ongoing fixes that always applies there. >>> >>> There aren't any known issues that will cause file consistency to >>> break or anything; I'd be more worried about clients having issues >>> reconnecting when their network blips or an MDS fails over. >>> -Greg >>> >>> > >>> > MULTIPLE ACTIVE METADATA SERVERS >>> > < >>> https://docs.ceph.com/docs/nautilus/cephfs/kernel-features/#multiple-active-metadata-servers >>> > >>> > >>> > The feature has been supported since the Luminous release. It is >>> > recommended to use Linux kernel clients >= 4.14 when there are multiple >>> > active MDS. >>> > Thank you, >>> > Robert LeBlanc >>> > ---------------- >>> > Robert LeBlanc >>> > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 >>> > _______________________________________________ >>> > ceph-users mailing list -- ceph-users@xxxxxxx >>> > To unsubscribe send an email to ceph-users-leave@xxxxxxx >>> > >>> _______________________________________________ >>> ceph-users mailing list -- ceph-users@xxxxxxx >>> To unsubscribe send an email to ceph-users-leave@xxxxxxx >>> >> _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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