Re: Network-based RAID6

[Stan Hoeppner <stan@hardwarefreak.com>]

Roman Mamedov put forth on 3/30/2011 3:49 AM:
> On Wed, 30 Mar 2011 11:20:41 +0400
> CoolCold <coolthecold@gmail.com> wrote:
> 
>> Looking on your host I think you speak russian, so may be this will be
>> somehow helpful for you
>> http://community.livejournal.com/ru_root/2216389.html
> 
> Thanks -- I have looked through the websites of some distributed filesystems
> (Ceph, GlusterFS, MooseFS etc) and checked this thread too, but from what I
> could find, all filesystems I read about so far are at most capable of RAID0 or
> RAID1-like modes, where fault-tolerance is either not provided, or achieved
> only by "all data is replicated across N nodes", which of course divides the
> total usable space by N. I haven't found any FS which would do block-level
> replication relying not on dumb copies, but on RAID5/6-like parity algorithms
> for fault-tolerance. Maybe I missed something?

You likely won't find any distributed filesystem that performs block
level replication over the network, at least not a FOSS one.  These are
filesystems, mind you, not distributed block device drivers.  If they
perform any replication to afford a level of fault tolerance, it will be
at the file level, not the block level.

If you want true block level replication over a network, look into DRBD.
 However, it is also limited to mirroring.

-- 
Stan