Re: [ovirt-users] Performance differences between ext4 and XFS
I just got bitten by this particular problem, on a heavily used disk image. I'm trying to defragment the disk images. Hop this will help. > Le 8 juin 2017 à 07:19, Markus Stockhausen <stockhau...@collogia.de> a écrit : > > 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 > <https://access.redhat.com/solutions/532663> > > Even with tuning the XFS allocation policy on the qcow2 directory with > > xfs_io -c 'extsize -R 2M' > > A nice 3rd party explanation can be found here: > > https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-deadlock-kmem_alloc/ > > <https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-deadlock-kmem_alloc/> > > Markus > > Von: users-boun...@ovirt.org <mailto:users-boun...@ovirt.org> > [users-boun...@ovirt.org <mailto:users-boun...@ovirt.org>]" im Auftrag von > "FERNANDO FREDIANI [fernando.fredi...@upx.com > <mailto:fernando.fredi...@upx.com>] > Gesendet: Mittwoch, 7. Juni 2017 23:35 > An: users@ovirt.org <mailto:users@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 > ___ > Users mailing list > Users@ovirt.org <mailto:Users@ovirt.org> > http://lists.ovirt.org/mailman/listinfo/users > <http://lists.ovirt.org/mailman/listinfo/users> ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Performance differences between ext4 and XFS
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' 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-boun...@ovirt.org [users-boun...@ovirt.org]" im Auftrag von "FERNANDO FREDIANI [fernando.fredi...@upx.com] *Gesendet:* Mittwoch, 7. Juni 2017 23:35 *An:* users@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 ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Performance differences between ext4 and XFS
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' 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-boun...@ovirt.org [users-boun...@ovirt.org]" im Auftrag von "FERNANDO FREDIANI [fernando.fredi...@upx.com] Gesendet: Mittwoch, 7. Juni 2017 23:35 An: users@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 Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. Ãber das Internet versandte E-Mails können unter fremden Namen erstellt oder manipuliert werden. Deshalb ist diese als E-Mail verschickte Nachricht keine rechtsverbindliche Willenserklärung. Collogia Unternehmensberatung AG Ubierring 11 D-50678 Köln Vorstand: Kadir Akin Dr. Michael Höhnerbach Vorsitzender des Aufsichtsrates: Hans Kristian Langva Registergericht: Amtsgericht Köln Registernummer: HRB 52 497 This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. e-mails sent over the internet may have been written under a wrong name or been manipulated. That is why this message sent as an e-mail is not a legally binding declaration of intention. Collogia Unternehmensberatung AG Ubierring 11 D-50678 Köln executive board: Kadir Akin Dr. Michael Höhnerbach President of the supervisory board: Hans Kristian Langva Registry office: district court Cologne Register number: HRB 52 497 ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
[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 ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
