Re: sharing single SSD across multiple HD based OSDs

[Daniel Sung <daniel.sung@xxxxxxxxxxxxxxxxxxxxx>]

The way I did this was to use:

ceph-volume lvm batch /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf etc

Where you just list all of the block devices you want to use in a group. It will automatically determine which devices are SSD and then automatically partition it for you and share it amongst the HDD OSDs.

On Tue, 10 Dec 2019 at 05:12, Nathan Fish <lordcirth@xxxxxxxxx> wrote:

You can loop over the creation of LVs on the SSD of a fixed size, then
loop over creating OSDs assigned to each of them. That is what we did,
it wasn't bad.

On Mon, Dec 9, 2019 at 9:32 PM Philip Brown <pbrown@xxxxxxxxxx> wrote:
>
> 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
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