[ovirt-users] Performance differences between ext4 and XFS

[Markus Stockhausen]

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-deadlock-kmem_alloc/

Markus

________________________________
Von: users-bounces at ovirt.org [users-bounces at ovirt.org]" im Auftrag von "FERNANDO FREDIANI [fernando.frediani at upx.com]
Gesendet: Mittwoch, 7. Juni 2017 23:35
An: users at 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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