Alphe Salas
I.T ingeneer
On 07/17/2014 12:47 PM, Christoph Hellwig wrote:
On Thu, Jul 17, 2014 at 10:11:09AM -0400, Alphe Salas wrote:
Usually when I talk to dev team about this problem they tell me that the
real problem is the lack of trim in XFS, but my own analysis shows that the
real problem is ceph internal way to handle data. It is ceph that never
discard any replicas and never "clean" itself to only keep records of the
data in use.
XFS supports TRIM just fine - with -o discard it will issue TRIMs on
unlink, and with fstrim you can do it explicitly. Note that the online
discard might be very slow for all Linux filesystems, although I've not
actually tested it on top of RBD.
I will test it again probably the point I missed it that you have to
unmount / remount the XFS RBD image in order to see the data disapear
from the real disk space old in ceph. I will try it today and comeback
with copy /paste of ceph -s etc..
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