12:19 a.m.
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Hi Fernando,
we personally like XFS very much. But XFS + qcow2 (even for snapshots in OV=
irt)
comes close to a no-go these days. We are experience excessive fragmentatio=
n.
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-deadl=
ock-kmem_alloc/
Markus
________________________________
Von: users-bounces(a)ovirt.org [users-bounces(a)ovirt.org]" im Auftrag von "FER=
NANDO 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 Ma=
chines 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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0pt;">
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"font-family: Tahoma; font-size: 13px;">Hi Fernando,
</div>
<div style=3D"font-family: Tahoma; font-size: 13px;"><br>
</div>
<div style=3D"font-family: Tahoma; font-size: 13px;">we personally like
XFS=
very much. But XFS + qcow2 (even for snapshots in OVirt)</div>
<div style=3D"font-family: Tahoma; font-size: 13px;">comes close to a
no-go=
these days. We are experience excessive fragmentation.</div>
<div style=3D"font-family: Tahoma; font-size: 13px;">For more info see
unre=
solved Redhat Info:</div>
<div><font face=3D"Tahoma"><span style=3D"font-size:
13px;"><br>
</span></font></div>
<div><font face=3D"Tahoma"><span style=3D"font-size:
13px;">https://access.=
redhat.com/solutions/532663</span></font></div>
<div style=3D"font-family: Tahoma; font-size: 13px;"><br>
</div>
<div style=3D"font-family: Tahoma; font-size: 13px;">Even with tuning the
X=
FS allocation policy on the qcow2 directory with </div>
<div style=3D"font-family: Tahoma; font-size: 13px;"><br>
</div>
<div><font face=3D"Tahoma"><span style=3D"font-size:
13px;">xfs_io -c 'exts=
ize -R 2M' <qcow2-dir></span></font></div>
<div style=3D"font-family: Tahoma; font-size: 13px;"><br>
</div>
<div style=3D"font-family: Tahoma; font-size: 13px;">A nice 3rd party
expla=
nation can be found here:</div>
<div style=3D"font-family: Tahoma; font-size: 13px;"><br>
</div>
<div><font face=3D"Tahoma"><span style=3D"font-size:
13px;">https://blog.co=
decentric.de/en/2017/04/xfs-possible-memory-allocation-deadlock-kmem_alloc/=
</span></font></div>
<div style=3D"font-family: Tahoma; font-size: 13px;"><br>
</div>
<div style=3D"font-family: Tahoma; font-size: 13px;">Markus</div>
<div style=3D"font-family: Tahoma; font-size: 13px;"><br>
</div>
</div>
</div>
</div>
</div>
</div>
<div id=3D"ofmeet-extension-installed"
style=3D"display:none"></div>
</div>
</div>
<div style=3D"font-family: Times New Roman; color: #000000; font-size: 16px=
">
<hr tabindex=3D"-1">
<div id=3D"divRpF447039" style=3D"direction: ltr;"><font
face=3D"Tahoma" si=
ze=3D"2" color=3D"#000000"><b>Von:</b>
users-bounces(a)ovirt.org [users-bounc=
es(a)ovirt.org]&quot; im Auftrag von "FERNANDO FREDIANI [fernando.fredia=
ni(a)upx.com]<br>
<b>Gesendet:</b> Mittwoch, 7. Juni 2017 23:35<br>
<b>An:</b> users(a)ovirt.org<br>
<b>Betreff:</b> [ovirt-users] Performance differences between ext4 and
XFS<=
br>
</font><br>
</div>
<div></div>
<div><font face=3D"arial, helvetica, sans-serif">Just wanted to find
out wh=
at filesystem people are using to host
</font>Virtual Machines in qcow2 files in a filesystem in Localstorage, ext=
4 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>
</body>
</html>
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