Hi all,
I have been trying to migrate the journal to SSD partition for an while,
basically I followed the guide here [1], I have the below configuration
defined in the ceph.conf
[osd.0]
osd_journal = /dev/disk/by-partlabel/journal-1
And then create the journal in this way,
# ceph-osd -i 0 -mkjournal
After that, I started the osd, and I saw the service is started successfully
from the log print out on the console,
08 14:03:35 ceph1 ceph-osd[5111]: starting osd.0 at :/0 osd_data
/var/lib/ceph/osd/ceph-0 /dev/disk/by-partlabel/journal-1
08 14:03:35 ceph1 ceph-osd[5111]: 2018-11-08 14:03:35.618247 7fe8b54b28c0 -1
osd.0 766 log_to_monitors {default=true}
But I not sure whether the new journal is effective or not, looks like it is
still using the old partition (/dev/sdc2) for journal, and new partition which
is actually "dev/sde1" has no information on the journal,
# ceph-disk list
/dev/sdc :
/dev/sdc2 ceph journal, for /dev/sdc1
/dev/sdc1 ceph data, active, cluster ceph, osd.0, journal /dev/sdc2
/dev/sdd :
/dev/sdd2 ceph journal, for /dev/sdd1
/dev/sdd1 ceph data, active, cluster ceph, osd.1, journal /dev/sdd2
/dev/sde :
/dev/sde1 other, 0fc63daf-8483-4772-8e79-3d69d8477de4
/dev/sdf other, unknown
# ls -l /var/lib/ceph/osd/ceph-0/journal
lrwxrwxrwx 1 ceph ceph 58 21 2018 /var/lib/ceph/osd/ceph-0/journal ->
/dev/disk/by-partuuid/5b5cd6f6-5de4-44f3-9d33-e8a7f4b59f61
# ls -l /dev/disk/by-partuuid/5b5cd6f6-5de4-44f3-9d33-e8a7f4b59f61
lrwxrwxrwx 1 root root 10 8 13:59
/dev/disk/by-partuuid/5b5cd6f6-5de4-44f3-9d33-e8a7f4b59f61 -> ../../sdc2
My question is how I know which partition is taking the role of journal? Where
can I see the new journal partition is linked?
Any comments is highly appreciated!
[1] https://fatmin.com/2015/08/11/ceph-show-osd-to-journal-mapping/
Best Regards,
Dave Chen
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