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[Discuss] On Btrfs raid and odd-count disks

Richard Pieri <richard.pieri at> writes:

> On 4/10/2013 11:00 AM, Derek Atkins wrote:
>> Is there a way to set up btrfs such that it can suvive a failure of any
>> two disks in the array (ala raid6 or raid-z2)?
> Btrfs currently does not do n-way replication. It's in the works along
> with raid5/6.
> It is possible to layer Btrfs on dm-raid and mdadm devices. You can
> build ZFS-like subdevices as RAID1 or RAID5/6 and use these metadevices
> to create your Btrfs volumes.

Sure, but then you're subject to the raid5 write hole (and I think raid6
is also subject).  I'm trying to avoid that by using a raiding
filesystem like ZFS or BTRFS.


       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL:    PP-ASEL-IA     N1NWH
       warlord at MIT.EDU                        PGP key available

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