Am Dienstag, 26. Februar 2013 schrieb Fajar A. Nugraha: > On Tue, Feb 26, 2013 at 11:59 AM, Mike Fleetwood > > <mike.fleetw...@googlemail.com> wrote: > > On 25 February 2013 23:35, Suman C <schakr...@gmail.com> wrote: > >> Hi, > >> > >> I think it would be great if there is a lvm volume or zfs zvol type > >> support in btrfs. > > > > Btrfs already has capabilities to add and remove block devices on the > > fly. Data can be stripped or mirrored or both. Raid 5/6 is in > > testing at the moment. > > https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devic > > es https://btrfs.wiki.kernel.org/index.php/UseCases#RAID > > > > Which specific features do you think btrfs is lacking? > > I think he's talking about zvol-like feature. > > In zfs, instead of creating a > filesystem-that-is-accessible-as-a-directory, you can create a zvol > which behaves just like any other standard block device (e.g. you can > use it as swap, or create ext4 filesystem on top of it). But it would > also have most of the benefits that a normal zfs filesystem has, like: > - thin provisioning (sparse allocation, snapshot & clone) > - compression > - integrity check (via checksum) > > Typical use cases would be: > - swap in a pure-zfs system > - virtualization (xen, kvm, etc) > - NAS which exports the block device using iscsi/AoE > > AFAIK no such feature exist in btrfs yet.
Sounds like the RADOS block device stuff for Ceph. -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 -- 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
