[plug] OpenSolaris, ZFS, RAID-Z Comments

Bill Kenworthy billk at iinet.net.au
Thu Sep 2 13:03:44 WST 2010

On Thu, 2010-09-02 at 13:21 +1000, Daniel Pittman wrote:
> Tim <weirdit at gmail.com> writes:
> Anyway, in addition to that the RHEL senior engineer assigned to review BTRFS
> for their systems[1] had serious concerns about the design leading to
> unbounded fragmentation (which Chris Mason and others dispute), and unarguably
> found a nasty bug leading to a pathological fragmentation case (now fixed).
> Plus, the thing is new and barely has a stable on-disk format.
> So, um, to my mind?  BTRFS is really, really interesting (and so is native
> ZFS, since that has ... design risks too).  In about five years when other
> people finish losing data to edge cases, when performance stabilizes, and when
> it is clear that the design isn't broken at heart I look forward to deploying
> it.
> Until then XFS will do me: a very long and stable history, high performance,
> and a record of both scaling up to multi-core and multi-node NUMA systems, and
> of eliminating performance bottlenecks in the file system as time goes on.
>         Daniel

I think BTRFS is interesting, but not ready for prime time - Ive been
looking at Ceph (which uses BTRFS) to unify a set of separate storage -
while Ceph is being used in production systems, being on the ceph
mailing list where BTRFS comes up regularly is an education!

Depends on the value risk assessment puts on your data ...


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