8:36 a.m.
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Many thanks for your input Markus. Helps to device before putting the
server in production.
Regards
Fernando
On 08/06/2017 02:19, Markus Stockhausen wrote:
Hi Fernando,
we personally like XFS very much. But XFS + qcow2 (even for snapshots
in OVirt)
comes close to a no-go these days. We are experience excessive
fragmentation.
For more info see unresolved Redhat Info:
https://access.redhat.com/solutions/532663
Even with tuning the XFS allocation policy on the qcow2 directory with
xfs_io -c 'extsize -R 2M' <qcow2-dir>
A nice 3rd party explanation can be found here:
https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-dea...
Markus
------------------------------------------------------------------------
*Von:* users-bounces(a)ovirt.org [users-bounces(a)ovirt.org]" im Auftrag
von "FERNANDO FREDIANI [fernando.frediani(a)upx.com]
*Gesendet:* Mittwoch, 7. Juni 2017 23:35
*An:* users(a)ovirt.org
*Betreff:* [ovirt-users] Performance differences between ext4 and XFS
Just wanted to find out what filesystem people are using to host
Virtual Machines in qcow2 files in a filesystem in Localstorage, ext4
or XFS ?
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.
Fernando
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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>
</div>
<blockquote type="cite"
cite="mid:12EF8D94C6F8734FB2FF37B9FBEDD173010E01D79F@EXCHANGE.collogia.de">
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<div>
<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://ac...
<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>
</div>
<div style="font-family: Tahoma; font-size:
13px;">Markus</div>
<div style="font-family: Tahoma; font-size:
13px;"><br>
</div>
</div>
</div>
</div>
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font-size: 16px">
<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>
</div>
</div>
</div>
</blockquote>
<br>
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