> Op 9 januari 2017 om 13:02 schreef Stuart Harland > <s.harl...@livelinktechnology.net>: > > > Hi, > > We’ve been operating a ceph storage system storing files using librados > (using a replicated pool on rust disks). We implemented a cache over the top > of this with SSDs, however we now want to turn this off. > > The documentation suggests setting the cache mode to forward before draining > the pool, however the ceph management controller spits out an error about > this saying that it is unsupported and hence dangerous. >
What version of Ceph are you running? And can you paste the exact command and the output? Wido > The thing is I cannot really locate any documentation as to why it’s > considered unsupported and under what conditions it is expected to fail: I > have read a passing comment about EC pools having data corruption, but we are > using replicated pools. > > Is this something that is safe to do? > > Otherwise I have noted the read proxy mode of cache tiers which is documented > as a mechanism to transition from write back to disabled, however the > documentation is even sparser on this than forward mode. Would this be a > better approach if there is some unsupported behaviour in the forward mode > cache option? > > Any thoughts would be appreciated - we really cannot afford to corrupt the > data, and I really do not want to have to do some manual software based > eviction on this data. > > regards > > Stuart > > > − Stuart Harland: > Infrastructure Engineer > Email: s.harl...@livelinktechnology.net > <mailto:s.harl...@livelinktechnology.net> > > > > LiveLink Technology Ltd > McCormack House > 56A East Street > Havant > PO9 1BS > > IMPORTANT: The information transmitted in this e-mail is intended only for > the person or entity to whom it is addressed and may contain confidential > and/or privileged information. If you are not the intended recipient of this > message, please do not read, copy, use or disclose this communication and > notify the sender immediately. Any review, retransmission, dissemination or > other use of, or taking any action in reliance upon this information by > persons or entities other than the intended recipient is prohibited. Any > views or opinions presented in this e-mail are solely those of the author and > do not necessarily represent those of LiveLink. This e-mail message has been > checked for the presence of computer viruses. However, LiveLink is not able > to accept liability for any damage caused by this e-mail. > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
