sharing single SSD across multiple HD based OSDs

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I have a bunch of hard drives I want to use as OSDs, with ceph nautilus.

ceph-volume lvm create makes straight raw dev usage relatively easy, since you can just do

ceph-volume lvm create --data /dev/sdc

or whatever.
Its nice that it takes care of all the LVM jiggerypokery automatically.

but.. what if you have a single SSD. lets call it /dev/sdx. and I want to use it for the WAL, for
/dev/sdc, sdd, sde, sdf, and so on.

Do you have to associate each OSD with a unique WAL dev, or can they "share"?

Do I really have to MANUALLY go carve up /dev/sdx into slices, LVM or otherwise, and then go hand manage the slicing?

ceph-volume lvm create --data /dev/sdc --block.wal /dev/sdx1
ceph-volume lvm create --data /dev/sdd --block.wal /dev/sdx2
ceph-volume lvm create --data /dev/sde --block.wal /dev/sdx3
?

can I not get away with some other more simplified usage?



--
Philip Brown| Sr. Linux System Administrator | Medata, Inc. 
5 Peters Canyon Rd Suite 250 
Irvine CA 92606 
Office 714.918.1310| Fax 714.918.1325 
pbrown@xxxxxxxxxx| www.medata.com
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