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 <ulembke@xxxxxxxxxxxx> 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 >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@xxxxxxxxxxxxxx >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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