Can't thus be done with a regular file and a loop back device? Remco
On 26 Feb 2013, at 06:35, Suman C <schakr...@gmail.com> wrote: > Yes, zvol like feature where a btrfs subvolume like construct can be > made available as a LUN/block device. This device can then be used by > any application that wants a raw block device. iscsi is another > obvious usecase. Having thin provisioning support would make it pretty > awesome. > > Suman > > On Mon, Feb 25, 2013 at 5:46 PM, Fajar A. Nugraha <l...@fajar.net> wrote: >> 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_Devices >>> 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. >> >> -- >> Fajar > -- > 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
