[ovirt-users] Performance differences between ext4 and XFS

[FERNANDO FREDIANI]

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-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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