On 11/15/19 4:25 PM, Paul Emmerich wrote: > On Fri, Nov 15, 2019 at 4:02 PM Wido den Hollander <w...@42on.com> wrote: >> >> I normally use LVM on top >> of each device and create 2 LVs per OSD: >> >> - WAL: 1GB >> - DB: xx GB > > Why? I've seen this a few times and I can't figure out what the > advantage of doing this explicitly on the LVM level instead of relying > on BlueStore to handle this. >
If the WAL+DB are on a external device you want the WAL to be there as well. That's why I specify the WAL separate. This might be an 'old habbit' as well. Wido > > Paul > >> >>> >>> >>> The initial cluster is +1PB and we’re planning to expand it again with >>> 1PB in the near future to migrate our data. >>> >>> We’ll only use the system thru the RGW (No CephFS, nor block device), >>> and we’ll store “a lot” of small files on it… (Millions of files a day) >>> >>> >>> >>> The reason I’m asking it, is that I’ve been able to break the test >>> system (long story), causing OSDs to fail as they ran out of space… >>> Expanding the disks (the block DB device as well as the main block >>> device) failed with the ceph-bluestore-tool… >>> >>> >>> >>> Thanks for your answer! >>> >>> >>> >>> Kristof >>> >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
