Well I think the opposite what you suggest... I want use btrfs inside the KVM guest, in order to increase/decrease the size oh disk partition...
2016-02-02 14:53 GMT-02:00 brian mullan <bmullan.m...@gmail.com>: > Gilberto, > > I have used btrfs for almost 2 years and like it alot for its features. > I've not used it with proxmox though. > > Matter of fact I just changed my machine to use btrfs raid10 (btrfs raid > not mdm raid). In btrfs this is only 1 command: > > reference: btrfs with multiple devices > <https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices> > example: > # Use raid10 for both data and metadata > mkfs.btrfs -m raid10 -d raid10 /dev/sdb /dev/sdc /dev/sdd /dev/sde > > > However, I have learned a lot over that time also. > > First, I don't think its yet recommended to run KVM on btrfs. This could > have changed but it would be wise to understand what the concerns were. > > I think it had to do with the COW algorithm of btrfs will churn with every > change made to the running kvm 'image" file... causing high cpu etc. > > reference: http://www.linux-kvm.org/page/Tuning_KVM > > see the statement at the bottom... > *Don't use the linux filesystem btrfs on the host for the image files. It > will result in low IO performance. The kvm guest may even freeze when high > IO traffic is done on the guest. * > > However, LXC containers on the other hand actually work wonderfully with > btrfs as you can specify the LXC container "backingstore" to be btrfs and > cloning, etc becomes almost instantaneous. > > > > > *If 'btrfs' is specified, then the target filesystem must be btrfs, and the > container rootfs will be created as a new subvolume. This allows snapshotted > clones to be created, but also causes rsync --one-filesystem to treat it as a > separate filesystem.* > > > So today I have my KVM images run off an ext4 disk but my lxc containers > are on my main btrfs raid10. > > Others may have better insight. > > Brian > > -- Gilberto Ferreira +55 (47) 9676-7530 Skype: gilberto.nunes36
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