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