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<p>Many thanks for your input Markus. Helps to device before putting
the server in production.</p>
<p>Regards<br>
Fernando<br>
</p>
<br>
<div class="moz-cite-prefix">On 08/06/2017 02:19, Markus Stockhausen
wrote:<br>
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<div style="font-family: Tahoma; font-size: 13px;">Hi
Fernando, </div>
<div style="font-family: Tahoma; font-size: 13px;"><br>
</div>
<div style="font-family: Tahoma; font-size: 13px;">we
personally like XFS very much. But XFS + qcow2
(even for snapshots in OVirt)</div>
<div style="font-family: Tahoma; font-size: 13px;">comes
close to a no-go these days. We are experience
excessive fragmentation.</div>
<div style="font-family: Tahoma; font-size: 13px;">For
more info see unresolved Redhat Info:</div>
<div><font face="Tahoma"><span style="font-size:
13px;"><br>
</span></font></div>
<div><font face="Tahoma"><span style="font-size:
13px;"><a class="moz-txt-link-freetext" href="https://access.redhat.com/solutions/532663">https://access.redhat.com/solutions/532663</a></span></font></div>
<div style="font-family: Tahoma; font-size: 13px;"><br>
</div>
<div style="font-family: Tahoma; font-size: 13px;">Even
with tuning the XFS allocation policy on the
qcow2 directory with </div>
<div style="font-family: Tahoma; font-size: 13px;"><br>
</div>
<div><font face="Tahoma"><span style="font-size:
13px;">xfs_io -c 'extsize -R 2M'
<qcow2-dir></span></font></div>
<div style="font-family: Tahoma; font-size: 13px;"><br>
</div>
<div style="font-family: Tahoma; font-size: 13px;">A
nice 3rd party explanation can be found here:</div>
<div style="font-family: Tahoma; font-size: 13px;"><br>
</div>
<div><font face="Tahoma"><span style="font-size:
13px;"><a class="moz-txt-link-freetext" href="https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-deadlock-kmem_alloc/">https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-deadlock-kmem_alloc/</a></span></font></div>
<div style="font-family: Tahoma; font-size: 13px;"><br>
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<div style="font-family: Tahoma; font-size: 13px;">Markus</div>
<div style="font-family: Tahoma; font-size: 13px;"><br>
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<hr tabindex="-1">
<div id="divRpF447039" style="direction: ltr;"><font
color="#000000" face="Tahoma" size="2"><b>Von:</b>
<a class="moz-txt-link-abbreviated" href="mailto:users-bounces@ovirt.org">users-bounces@ovirt.org</a> [<a class="moz-txt-link-abbreviated" href="mailto:users-bounces@ovirt.org">users-bounces@ovirt.org</a>]" im
Auftrag von "FERNANDO FREDIANI [<a class="moz-txt-link-abbreviated" href="mailto:fernando.frediani@upx.com">fernando.frediani@upx.com</a>]<br>
<b>Gesendet:</b> Mittwoch, 7. Juni 2017 23:35<br>
<b>An:</b> <a class="moz-txt-link-abbreviated" href="mailto:users@ovirt.org">users@ovirt.org</a><br>
<b>Betreff:</b> [ovirt-users] Performance differences
between ext4 and XFS<br>
</font><br>
</div>
<div><font face="arial, helvetica, sans-serif">Just wanted to
find out what filesystem people are using to host
</font>Virtual Machines in qcow2 files in a filesystem in
Localstorage, ext4 or XFS ?<br>
<br>
I normally like XFS for big files which is the case fo VMs,
but wondered if anyone could see any performance advantage
when compared with ext4.<br>
<br>
Fernando<br>
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