On Tue, Jul 6, 2021 at 2:52 PM Nir Soffer <nsof...@redhat.com> wrote:
> > Too bad. > > You can evaluate how ovirt 4.4. will work with this appliance using > this dd command: > > dd if=/dev/zero bs=8M count=38400 of=/path/to/new/disk > oflag=direct conv=fsync > > We don't use dd for this, but the operation is the same on NFS < 4.2. > > I confirm I'm able to saturate the 1Gb/s link. tried creating a 10Gb file on the StoreOnce appliance # time dd if=/dev/zero bs=8M count=1280 of=/rhev/data-center/mnt/ 172.16.1.137\:_nas_EXPORT-DOMAIN/ansible_ova/test.img oflag=direct conv=fsync 1280+0 records in 1280+0 records out 10737418240 bytes (11 GB) copied, 98.0172 s, 110 MB/s real 1m38.035s user 0m0.003s sys 0m2.366s So are you saying that after upgrading to 4.4.6 (or just released 4.4.7) I should be able to export with this speed? Or anyway I do need NFS v4.2? BTW: is there any capping put in place by oVirt to the export phase (the qemu-img command in practice)? Designed for example not to perturbate the activity of hypervisor?Or do you think that if I have a 10Gb/s network backend and powerful disks on oVirt and powerful NFS server processing power I should have much more speed? > Based on the 50 MiB/s rate you reported earlier, I guess you have a > 1Gbit network to > this appliance, so zeroing can do up to 128 MiB/s, which will take > about 40 minutes > for 300G. > > Using NFS 4.2, fallocate will complete in less than a second. > I can sort of confirm this also for 4.3.10. I have a test CentOS 7.4 VM configured as NFS server and, if I configure it as an export domain using the default autonegotiate option, it is (strangely enough) mounted as NFS v4.1 and the initial fallocate takes some minutes (55Gb disk). If I reconfigure it forcing NFS v4.2, it does it and the initial fallocate is immediate, in the sense that "ls -l" on the export domain becomes quite immediately the size of the virtual disk. Thanks, Gianluca
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