3 questions:
1. I'd like to use xfs devices with a separate log device in a ceph cluster. What's the best way to do this? Is it possible to specify xfs log devices in the [osd.x] sections of ceph.conf?
E.G.:
[osd.0]
host = delta
devs = /dev/sdx
osd mkfs options xfs = -d su=131072,sw=8 -i size=1024 -l logdev=/dev/sdq1,su=131072
[osd.1]
host = epsilon
devs = /dev/sdy
osd mkfs options xfs = -d su=131072,sw=8 -i size=1024 -l logdev=/dev/sdq2,su=131072
2. Is this the correct syntax for the line without the log device options?
osd mkfs options xfs = -d su=131072,sw=8 -i size=1024
3. For osd journal devices. I assume there's a 1:1 relationship between osds and journal devices. The section in sample.ceph.conf seems to imply a single entry.
Should there be an osd journal entry in each [osd.x] section of ceph.conf?
[osd]
; This is where the osd expects its data
osd data = /data/$name
; Ideally, make the journal a separate disk or partition.
; 1-10GB should be enough; more if you have fast or many
; disks. You can use a file under the osd data dir if need be
; (e.g. /data/$name/journal), but it will be slower than a
; separate disk or partition.
; This is an example of a file-based journal.
osd journal = /data/$name/journal
osd journal size = 1000 ; journal size, in megabytes
On my cluster (deployed with ceph-deploy) the data is in /var/lib/ceph/osd. Not /data/$name as in the sample file. Directory organization on my cluster:
/var/lib/ceph/osd/:
ceph-0 ceph-10 ceph-12 ceph-14 ceph-16 ceph-18 ceph-2 ceph-21 ceph-3 ceph-5 ceph-7 ceph-9
ceph-1 ceph-11 ceph-13 ceph-15 ceph-17 ceph-19 ceph-20 ceph-22 ceph-4 ceph-6 ceph-8
/var/lib/ceph/osd/ceph-0:
/var/lib/ceph/osd/ceph-1:
ls /data
ls: cannot access /data: No such file or directory
Thanks,
Tim
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