Re: NVMe disk - size

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On Fri, Nov 15, 2019 at 4:39 PM Wido den Hollander <wido@xxxxxxxx> wrote:
>
>
>
> On 11/15/19 4:25 PM, Paul Emmerich wrote:
> > On Fri, Nov 15, 2019 at 4:02 PM Wido den Hollander <wido@xxxxxxxx> wrote:
> >>
> >>  I normally use LVM on top
> >> of each device and create 2 LVs per OSD:
> >>
> >> - WAL: 1GB
> >> - DB: xx GB
> >
> > Why? I've seen this a few times and I can't figure out what the
> > advantage of doing this explicitly on the LVM level instead of relying
> > on BlueStore to handle this.
> >
>
> If the WAL+DB are on a external device you want the WAL to be there as
> well. That's why I specify the WAL separate.
>
> This might be an 'old habbit' as well.

But the WAL will be placed onto the DB device if it isn't explicitly
specified, so there's no advantage to having a separate partition.


Paul

>
> Wido
>
> >
> > Paul
> >
> >>
> >>>
> >>>
> >>> The initial cluster is +1PB and we’re planning to expand it again with
> >>> 1PB in the near future to migrate our data.
> >>>
> >>> We’ll only use the system thru the RGW (No CephFS, nor block device),
> >>> and we’ll store “a lot” of small files on it… (Millions of files a day)
> >>>
> >>>
> >>>
> >>> The reason I’m asking it, is that I’ve been able to break the test
> >>> system (long story), causing OSDs to fail as they ran out of space…
> >>> Expanding the disks (the block DB device as well as the main block
> >>> device) failed with the ceph-bluestore-tool…
> >>>
> >>>
> >>>
> >>> Thanks for your answer!
> >>>
> >>>
> >>>
> >>> Kristof
> >>>
> >>>
> >>> _______________________________________________
> >>> ceph-users mailing list
> >>> ceph-users@xxxxxxxxxxxxxx
> >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> >>>
> >> _______________________________________________
> >> ceph-users mailing list
> >> ceph-users@xxxxxxxxxxxxxx
> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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