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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