On 05/28/2014 09:19 AM, 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 ;-)
I think the big issues is if the BTRFS defragmentation tools are made
safe for when lots of snapshots are used. BTRFS tends to be very fast
with Ceph on fresh filesystems, but the fragmentation, especially with
small writes to RBD objects, can just kill it.
Cheers
Cédric
Also no kernel backports are available
to stable kernels. So which one would you choose?
Stefan
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