[ceph-users] Migrate OSD journal to SSD partition

Dave.Chen at Dell.com Dave.Chen at Dell.com
Wed Nov 7 23:40:34 PST 2018

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_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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