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> Von: users-bounces@ovirt.org [users-bounces@ovirt.org]" im Auftrag v=
on "Blaster [blaster@556nato.com]=0A=
> Gesendet: Mittwoch, 18. Dezember 2013 06:24=0A=
> An: users@ovirt.org=0A=
> Betreff: [Users] Recommended file system?=0A=
> =0A=
> Any recommended file system to use to hold VM disk images?  EXT4? BTRFS(d=
isable COW I assume?)?  ZFS? XFS?=0A=
=0A=
Hello,=0A=
=0A=
from my point of view I would say do it as you like =0A=
and use the filesystem you are comfortable with.=0A=
Maybe to aspects that should be mentioned. =0A=
=0A=
1) We use a custom build Ubuntu NFS Server with XFS. =0A=
When we evaluated PROXMOX we noticed timeouts =0A=
during creation of QCOW2 images. The simple solution=0A=
was to change allocsize setting from some "insane high=0A=
in internet found recommendation" to 16M. So if your=0A=
VM writes a block into a empty disk area you only =0A=
allocate the surrounding 16M.=0A=
=0A=
2) COW of BTRFS could be a good idea especially if you =0A=
go with RAID5/6.  Even using Hardware RAID. Lets=0A=
assume you have a lot of VMs. All of them writing some=0A=
kind of data somewhere onto the disks. If each piece is=0A=
to small for a full stripe write you run into a read modify=0A=
write cycle. Consuming much more IOs. With COW=0A=
all this data may be written into one continuous block.=0A=
(Netapp sometimes shows quite high write ops, because=0A=
their WAFL works similar).=0A=
=0A=
Markus=0A=
=0A=
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