<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 2, 2017 at 11:45 PM, Sergey Kulikov <span dir="ltr"><<a href="mailto:serg_k@msm.ru" target="_blank">serg_k@msm.ru</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
I've upgraded to 4.1 release, it have great feature "Pass discards", that now can be used without vdsm hooks,<br>
After upgrade I've tested it with NFS 4.1 storage, exported from netapp, but unfortunately found out, that<br>
it's not working, after some investigation, I've found, that NFS implementation(even 4.1) in Centos 7<br>
doesn't support sparse files and fallocate(FALLOC_FL_PUNCH_<wbr>HOLE), that quemu uses for file storage, it was<br>
added only in kernel 3.18, and sparse files is also announced feature of upcoming NFS4.2,<br>
sparsify also not working on this data domains(runs, but nothing happens).<br>
<br>
This test also shows, that FALLOC_FL_PUNCH_HOLE not working, it was executed on centos ovirt host with mounted nfs share:<br>
# truncate -s 1024 test1<br>
# fallocate -p -o 0 -l 1024 test1<br>
fallocate: keep size mode (-n option) unsupported<br>
<br>
Is there any plans to backport this feature to node-ng, or centos? or we should wait for RHEL 8?<br></blockquote><div><br></div><div>Interesting, I was under the impression it was fixed some time ago, for 7.2[1] (kernel-3.10.0-313.el7)</div><div>Perhaps you are not mounted with 4.2?</div><div><br></div><div>Y.</div><div>[1] <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1079385">https://bugzilla.redhat.com/show_bug.cgi?id=1079385</a></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
NFS is more and more popular, so discards is VERY useful feature.<br>
I'm also planning to test fallocate on latest fedora with 4.x kernel and mounted nfs.<br>
<br>
Thanks for your work!<br>
<span class="gmail-HOEnZb"><font color="#888888"><br>
--<br>
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