Hi Jan,
thanks for the hint.
I changed the mount-option from noatime to relatime and will remount all
OSDs during weekend.
Udo
On 07.08.2015 16:37, Jan Schermer wrote:
ext4 does support external journal, and it is _FAST_
btw I'm not sure noatime is the right option nowadays for two reasons
1) the default is relatime which has minimal impact on performance
2) AFAIK some ceph features actually use atime (cache tiering was it?) or at
least so I gathered from some bugs I saw
Jan
On 07 Aug 2015, at 16:30, Udo Lembke ulem...@polarzone.de wrote:
Hi,
I use the ext4-parameters like Christian Balzer wrote in one posting:
osd mount options ext4 = user_xattr,rw,noatime,nodiratime
osd_mkfs_options_ext4 = -J size=1024 -E
lazy_itable_init=0,lazy_journal_init=0
The osd-journals are on SSD-Partitions (without filesystem). IMHO ext4 don't
support an different journal-device, like
xfs do, but I assume you mean the osd-jounal and not the filesystem journal?!
Udo
Am 07.08.2015 16:13, schrieb Burkhard Linke:
Hi,
On 08/07/2015 04:04 PM, Udo Lembke wrote:
Hi,
some time ago I switched all OSDs from XFS to ext4 (step by step).
I had no issues during mixed osd-format (the process takes some weeks).
And yes, for me ext4 performs also better (esp. the latencies).
Just out of curiosity:
Do you use a ext4 setup as described in the documentation? Did you try to
use external ext4 journals on SSD?
Regards,
Burkhard
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