As others have said here, it's probably not going to work for you especially if you want to use regular scheduled btrfs snapshots on the host (which I consider to be 50% of the reason why I use btrfs in the first place).
Once I had learned this lesson the hard way, I had a xen server using libvirt configured to provision from LVM storage. I had some preseed/kickstart/ansible recipes for VM provisioning that configured btrfs in the guests with appropriate scheduled snapshotting and remote send/receive to backup hosts. This worked well for me but it's not for everyone. I'm a btrfs fan, but have talked a few admins out of naively using btrfs in the manner that you've described. Particularly busy Windows HVM guests on a file-backed image sitting on a btrfs host filesystem with regular scheduled snapshots will deteriorate depressingly quickly. Having said that, most of my current btrfs superstitions on this use-case were formed around kernel 3.12, a long time ago now. On 16 September 2015 at 07:34, Gert Menke <g...@menke.ac> wrote: > Hi everybody, > > first off, I'm not 100% sure if this is the right place to ask, so if it's > not, I apologize and I'd appreciate a pointer in the right direction. > > I want to build a virtualization server to replace my current home server. > I'm thinking about a Debian system with libvirt/KVM. The system will have > one or two SSDs and five harddisks with some kind of software RAID5 for > storage. I'd like to have a filesystem with data checksums, so BTRFS seems > like the right way to go. However, I read that BTRFS does not perform well > as storage for KVM disk images. > (See here: http://www.linux-kvm.org/page/Tuning_KVM ) > > Is this still true? > > I would appreciate any comments and/or tips you might have on this topic. > > Is anyone using BTRFS as an image store? Are there any special settings I > should be aware of to make it work well? > > Thanks, > Gert > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
