On 09/08/12 12:43, Mark Kirkwood wrote:
I tried out a raft of xfs config changes and also made the Ceph
journal really big (10G):
$ mkfs.xfs -f -l internal,size=1024m -d agcount=4 /dev/sd[b,c]2
+ mount options with nobarrier,logbufs=8
The results improved a little, but still very slow for small request
sizes...
Some more careful analysis showed that all the benefit derived from the
ceph storage reinit after the filesystem was remade, so going back
gradually to the default filesystem options (mkfs.xfs, default mount
with noatime, discard) and 2G journal results in the same numbers as I
posted with the tweaked settings.
So sorry, appears to be nothing gained (on this system anyway) from said
tweaking.
Regards
Mark
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