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<div style="font-family: Tahoma; font-size: 13px;">Hi Fernando, </div>
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<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>
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<div><font face="Tahoma"><span style="font-size: 13px;">https://access.redhat.com/solutions/532663</span></font></div>
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<div style="font-family: Tahoma; font-size: 13px;">Even with tuning the XFS allocation policy on the qcow2 directory with </div>
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<div><font face="Tahoma"><span style="font-size: 13px;">xfs_io -c 'extsize -R 2M' <qcow2-dir></span></font></div>
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<div style="font-family: Tahoma; font-size: 13px;">A nice 3rd party explanation can be found here:</div>
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<div><font face="Tahoma"><span style="font-size: 13px;">https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-deadlock-kmem_alloc/</span></font></div>
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<div style="font-family: Tahoma; font-size: 13px;">Markus</div>
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<div id="divRpF447039" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>Von:</b> users-bounces@ovirt.org [users-bounces@ovirt.org]" im Auftrag von "FERNANDO FREDIANI [fernando.frediani@upx.com]<br>
<b>Gesendet:</b> Mittwoch, 7. Juni 2017 23:35<br>
<b>An:</b> users@ovirt.org<br>
<b>Betreff:</b> [ovirt-users] Performance differences between ext4 and XFS<br>
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<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>
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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>
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Fernando<br>
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