Hello, What's the version of the manager (engine)?
Could you please provide the link or the SPM and the host running the VM? Thanks, Ala On Sep 22, 2017 1:19 PM, "Troels Arvin" <tro...@arvin.dk> wrote: > Hello, > > I have a RHV 4.1 virtualized guest-server with a number of rather large > VirtIO virtual disks attached. The virtual disks are allocated from a > fibre channel (block) storage domain. The hypervisor servers run RHEL 7.4. > > When I take a snapshot of the guest, then it takes a long time to remove > the snapshots again, when the guest is powered off (a snapshot of a 2 TiB > disk takes around 3 hours to remove). However, when the guest is running, > then snapshot removal is very quick (perhaps around five minutes per > snapshot). The involved disks have not been written much to while they > had snapshots. > > I would expect the opposite: I.e., when the guest is turned off, then I > would assume that oVirt can handle snapshot removal in a much more > aggressive fashion than when performing a live snapshot removal? > > When performing offline snapshot removal, then on the hypervisor having > the SPM role, I see the following in output from "ps xauw": > > vdsm 10255 8.3 0.0 389144 27196 ? S<l 13:40 7:04 /usr/bin/qemu-img > convert -p -t none -T none -f qcow2 /rhev/data-center/mnt/blockSD/xxx/ > images/yyy/zzz -O raw /rhev/data-center/mnt/blockSD/xxx/images/yyy/ > zzz_MERGE > > I don't see the same kind of process running on a guest's hypervisor when > online snapshot removal is in progress. > > I've read most of https://www.ovirt.org/develop/release-management/ > features/storage/remove-snapshot/ > My interpretation from that document is that I should expect to see "qemu- > img commit" commands instead of "qemu-img convert" processes. Or? > > The RHV system involved is somewhat old, having been upgrade many times > from 3.x through 4.1. Could it be that it carries around old left-overs > which results in obsolete snapshot removal behavior? > > -- > Regards, > Troels Arvin > > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users >
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