If you want to specify vgname/lvname you have to create them manually and run:
ceph-volume lvm create --data /dev/sdc --block.db vgname/db-sdc
--block.wal vgname/wal-sdc
where you can also specify wal-size and block.db-size (among other options).
Or you do it with the 'batch' command:
ceph-volume lvm batch /dev/sdb ... /dev/sdj --db-devices /dev/sdk
--wal-devices /dev/sdl
but then you don't get to choose vgname/lvname, the batch command
creates the volume groups and logical volumes for you.
I would say the drive_groups approach is designed to automate things
so you don't need to worry about creating VGs and LVs.
Zitat von Will Payne <will@xxxxxxxxxxxxxxxx>:
Yea, I saw the drive group documentation. It might be just a
baby-related lack of sleep to blame but, to me, it wasn’t clear if I
could achieve what I wanted to.
I can set the criteria for which drives to use for data but can I
‘pair’ the data drive up with matching VG/LVs?
I’m trying to get to:
Data /dev/sdc
WAL vgname/wal-sdc
DB vgname/db-sdc
It might be that this is an incorrect / stupid way to set things up
but ISTR the docs stating pointing at an entire LV was best so you
don’t have to worry about specifying sizes, etc.
W
On 11 Jun 2020, at 13:10, Eugen Block <eblock@xxxxxx> wrote:
Hi,
assuming you're running Octopus the deployment guide [1] explains
it quite well.
To specify rocksDB/WAL devices you have to make use of "drive_groups" [2].
Regards,
Eugen
[1] https://docs.ceph.com/docs/octopus/cephadm/install/#deploy-osds
[2] https://docs.ceph.com/docs/octopus/cephadm/drivegroups/#drivegroups
Zitat von Will Payne <will@xxxxxxxxxxxxxxxx>:
Hi,
Total newbie question - I'm new to Ceph and am setting up a small
test cluster. I've set up five nodes and can see the available
drives but I'm unsure on exactly how I can add an OSD and specify
the locations for WAL+DB.
Maybe my Google-fu is weak but the only guides I can find refer to
ceph-deploy which, as far as I can see, is deprecated. Guides
which talk about using cephadm / ceph only mention adding a drive
but not specifying the WAL+DB locations.
I want to add HDDs as OSDs and put the WAL and DB onto separate
LVs on an SSD. How?
Will
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