I have 12 journals on 1 SSD, but I wouldn't recommend it if you want any real performance.
I use it on an archive type environment. On Wed, Jul 6, 2016 at 9:01 PM Goncalo Borges <goncalo.bor...@sydney.edu.au> wrote: > Hi George... > > > On my latest deployment we have set > > # grep journ /etc/ceph/ceph.conf > osd journal size = 20000 > > and configured the OSDs for each device running 'ceph-disk prepare' > > # ceph-disk -v prepare --cluster ceph --cluster-uuid XXX --fs-type xfs > /dev/sdd /dev/sdb > # ceph-disk -v prepare --cluster ceph --cluster-uuid XXX --fs-type xfs > /dev/sde /dev/sdb > # ceph-disk -v prepare --cluster ceph --cluster-uuid XXX --fs-type xfs > /dev/sdf /dev/sdb > # ceph-disk -v prepare --cluster ceph --cluster-uuid XXX --fs-type xfs > /dev/sdg /dev/sdb > > where sdb is an SSD. Once the previous commands finish, this is the > partition layout they create for the journal > > # parted -s /dev/sdb p > Model: DELL PERC H710P (scsi) > Disk /dev/sdb: 119GB > Sector size (logical/physical): 512B/512B > Partition Table: gpt > Disk Flags: > > Number Start End Size File system Name Flags > 1 1049kB 21.0GB 21.0GB ceph journal > 2 21.0GB 41.9GB 21.0GB ceph journal > 3 41.9GB 62.9GB 21.0GB ceph journal > 4 62.9GB 83.9GB 21.0GB ceph journal > > > However, never tested more than 4 journals per ssd. > > Cheers > G. > > > On 07/06/2016 10:03 PM, George Shuklin wrote: > > Hello. > > I've been testing Intel 3500 as journal store for few HDD-based OSD. I > stumble on issues with multiple partitions (>4) and UDEV (sda5, sda6,etc > sometime do not appear after partition creation). And I'm thinking that > partition is not that useful for OSD management, because linux do no allow > partition rereading with it contains used volumes. > > So my question: How you store many journals on SSD? My initial thoughts: > > 1) filesystem with filebased journals > 2) LVM with volumes > > Anything else? Best practice? > > P.S. I've done benchmarking: 3500 can support up to 16 10k-RPM HDD. > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > -- > Goncalo Borges > Research Computing > ARC Centre of Excellence for Particle Physics at the Terascale > School of Physics A28 | University of Sydney, NSW 2006 > T: +61 2 93511937 > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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