Re: [ovirt-users] NFS and pass discards\unmap question

On Feb 3, 2017 1:50 PM, "Nir Soffer" <nsoffer(a)redhat.com&gt; wrote: On Fri, Feb 3, 2017 at 2:29 PM, Sergey Kulikov <serg_k(a)msm.ru&gt; wrote: > > > Hm... maybe I need to set any options, is there any way to force ovirt to > mount with this extension, or version 4.2 > there is only 4.1 selection in "New Domain" menu. > Current mount options: > type nfs4 > (rw,relatime,vers=4.1,rsize=65536,wsize=65536,namlen=255,soft,nosharecache,proto=tcp,port=0,timeo=600,retrans=6,sec=sys,local_lock=none) > > it should work only if forced option vers=4.2 ? > I thought it's implemented as feature to older version, not 4.2, there is > few info about this. Looks like ovirt engine does not allow nfs version 4.2. But custom options can be used.

Y. We have this RFE: https://bugzilla.redhat.com/1406398 So practically, both sparsify and pass discard with NFS are useless in the current version. I think this should be fix for next 4.1 build. Nir > > > -- > > > > Friday, February 3, 2017, 14:45:43: > > > > > >> On Thu, Feb 2, 2017 at 11:45 PM, Sergey Kulikov <serg_k(a)msm.ru&gt; wrote: > > >> I've upgraded to 4.1 release, it have great feature "Pass >> discards", that now can be used without vdsm hooks, >> After upgrade I've tested it with NFS 4.1 storage, exported from >> netapp, but unfortunately found out, that >> it's not working, after some investigation, I've found, that NFS >> implementation(even 4.1) in Centos 7 >> doesn't support sparse files and fallocate(FALLOC_FL_PUNCH_HOLE), >> that quemu uses for file storage, it was >> added only in kernel 3.18, and sparse files is also announced feature of >> upcoming NFS4.2, >> sparsify also not working on this data domains(runs, but nothing >> happens). >> >> This test also shows, that FALLOC_FL_PUNCH_HOLE not working, it >> was executed on centos ovirt host with mounted nfs share: >> # truncate -s 1024 test1 >> # fallocate -p -o 0 -l 1024 test1 >> fallocate: keep size mode (-n option) unsupported >> >> Is there any plans to backport this feature to node-ng, or centos? or we >> should wait for RHEL 8? > > > > >> Interesting, I was under the impression it was fixed some time ago, >> for 7.2[1] (kernel-3.10.0-313.el7) >> Perhaps you are not mounted with 4.2? > > >> Y. >> [1] https://bugzilla.redhat.com/show_bug.cgi?id=1079385 >> >> NFS is more and more popular, so discards is VERY useful feature. >> I'm also planning to test fallocate on latest fedora with 4.x kernel and >> mounted nfs. >> >> Thanks for your work! >> >> -- >> >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users