Am 15.11.2012 16:14, schrieb Sage Weil:
On Thu, 15 Nov 2012, Stefan Priebe - Profihost AG wrote:
Hello list,
my main problem right now is that ceph does not scale for me (more vms using
rbd). It does not scale as the ceph-osd is using all my CPU core all the time
(8 cores) with just 4 SSDs. The SSDs are far away from being loaded.
What is the best way to find out what the ceph-osd process is doing all the
time?
A gperf graph is attached.
Hmm, most significant time seems to be in the allocator and doing
fsetxattr(2) (10%!). Also some path traversal stuff.
Can you try the wip-fd-simple-cache branch, which tries to spend less time
closing and reopening files? I'm curious how much of a different it will
make for you for both IOPS and CPU utilization.
Will try that this evening.
It is also possible to use leveldb for most attrs. If you set
'filestore xattr use omap = true' it should put most attrs in leveldb.
Do i have to recreate the cephfs?
Stefan
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