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: [email protected] [[email protected]]" im Auftrag von "FERNANDO FREDIANI [[email protected]] Gesendet: Mittwoch, 7. Juni 2017 23:35 An: [email protected] 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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