23 Mar
2021
23 Mar
'21
2:17 p.m.
Hi Dave,
For sure ceph-bluestore-tool can be used for that. Unfortunately it
lacks LVM tag manipulation stuff required to properly setup DB/WAL
volume for Ceph.
See https://tracker.ceph.com/issues/42928
Which means that LVM tags to be updated manually if pure
ceph-bluestore-tool is used.
Additionally there is a pending PR
(https://github.com/ceph/ceph/pull/39580) to implement DB/WAL
manipulation at ceph-volume (which in turn rely on ceph-bluestore-tool
to perform lower level operations). Hence one should either wait until
it's merged and backported or do such a backport (actually python code
only) on his own.
Thanks,
Igor
On 3/23/2021 2:37 PM, Dave Hall wrote:
> Hello,
>
> Based on other discussions in this list I have concluded that I need to add
> NVMe to my OSD nodes and expand the NVMe (DB/WAL) for each OSD. Is there a
> way to do this without destroying and rebuilding each OSD (after
> safe removal from the cluster, of course)? Is there a way to use
> ceph-bluestore-tool for this? Is it as simple as lvextend?
>
> Why more NVMe? Frequent DB spillovers, and the recommendation that the
> NVMe should be 40GB for every TB of HDD. When I did my initial setup I
> thought that 124GB of NVMe for a 12TB HDD would be sufficient, but by the
> above metric it should be more like 480GB of NVMe.
>
> Thanks.
>
> -Dave
>
> --
> Dave Hall
> Binghamton University
> kdhall(a)binghamton.edu
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