is your service only have one instance? are your service running on vm? On May 23, 2016 10:23 AM, "lin zhou" <hnuzhoul...@gmail.com> wrote:
> Christian Balzer,thanks for your reply. > > you say,kernel upgrade will interrupt service.but AFAIK,umount rbd and > strim > it on another machine will interrupt service too. > > In my environment,all krbd are online business,service interruption is > now allow. > > 2016-05-21 11:58 GMT+08:00 Christian Balzer <ch...@gol.com>: > > On Fri, 20 May 2016 17:00:03 +0800 lin zhou wrote: > > > >> Hi,cephers > >> we only using krbd in ceph.and it works well near two yeas.but now I > >> face a size problem. > >> > >> I have 7 nodes with 10 3T osd each.we using ceph 0.67.9 in > >> ubuntu12.04.I know it is too old,but update is beyond my control. > >> > >> and now we use 80% size,so we start to delete historic unneeded > >> data,but free size do not increase. > >> > >> and then I found total assigned size of rbds are much bigger than > >> ceph size,so it means if we do not do something,it will reach the > >> limit. > >> > >> but the true data in the user side,we only use 40%. > >> > >> I read the blog of Sebastien and some maillist.I know the command of > >> fstrim in kernel 3.18 can deal with it. and is it risky that update > >> kernel to 3.18 in ubuntu12.04? > >> > >> I try to add discard option in mount command,but it do not work. > >> > >> so what way do you recommend to free krbd size in ceph 0.67.9 in > >> ubuntu12.04 > >> > > > > If you're considering a kernel upgrade (and thus a service interruption), > > another option would be to unmount that image on your old machine, mount > > it on a newer machine and/or with librbd and fuse and then run fstrim. > > > > However trim is a pretty costly activity in Ceph, so it may > > a) impact your cluster performance and > > b) take a while, depending on how much data we're talking about. > > > > Lastly, while having a sparse storage serice like Ceph is very nice I > > always try to have enough actual space available to handle all > > commitments. > > > > Christian > > -- > > Christian Balzer Network/Systems Engineer > > ch...@gol.com Global OnLine Japan/Rakuten Communications > > http://www.gol.com/ > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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