On 5/28/14 07:19 , Cedric Lemarchand wrote:
Le 28/05/2014 16:15, Stefan Priebe - Profihost AG a écrit :
Am 28.05.2014 16:13, schrieb Wido den Hollander:
On 05/28/2014 04:11 PM, VELARTIS Philipp Dürhammer wrote:
Is someone using btrfs in production?
I know people say it’s still not stable. But do we use so many features
with ceph? And facebook uses it also in production. Would be a big speed
gain.
As far as I know the main problem is still performance degradation over
time. On a SSD-only cluster this would be less of a problem since seek
times on SSDs aren't a really big problem, but on spinning disks they are.
I haven't seen btrfs in production on any Ceph cluster I encountered.
It heavily fragements over time.
I just would add that it is inherent to *all* COW based file system, and
not specifically to BTRFS ;-)
Cheers
Cédric
I agree, but it appears to affect BtrFS more than others.
I'm using ZFS for other things (not Ceph). Those filesystems are slower
after several years, but only by a few percent (estimating from RRD
graphs). ZFS made a design decision to ignore fragmentation, as long as
the zpool is less than 80% full. Once there, it switches to an optimal
placement algorithm instead of the fast-but-inefficient placement
algorithm. This drives up the CPU usage and kills the IOps. So it does
suffer, but the pain doesn't hit until > 80% full.
I don't recall VxFS having any issue when using COW, but it's been a
while. The multi-million dollar storage array probably helped.
I never used ReiserFS in production, so I can't comment.
I haven't tried any other COW filesystems.
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