Don't use Mimic, support for it is far worse than Nautilus or Luminous. I
think we were the only company who built a product around Mimic, both
Redhat and Suse enterprise storage was Luminous and then Nautilus skipping
Mimic entirely.

We only offered Mimic as a default for a limited time and immediately moved
to Nautilus as it became available and Nautilus + Debian 10 has been great
for us.
Mimic and Debian 9 was... well, hacked together, due to the gcc backport
issues. That's not to say that it doesn't work, in fact Mimic (> 13.2.2)
and Debian 9 worked perfectly fine for us.

Our Debian 10 and Nautilus packages are just so much better and more stable
than Debian 9 + Mimic because we don't need to do weird things with Debian.
Check the mailing list for old posts around the Mimic release by me to see
how we did that build. It's not pretty, but it was the only way to use Ceph
>= Mimic on Debian 9.
All that mess has been eliminated with Debian 10.

Paul

-- 
Paul Emmerich

Looking for help with your Ceph cluster? Contact us at https://croit.io

croit GmbH
Freseniusstr. 31h
81247 M√ľnchen
www.croit.io
Tel: +49 89 1896585 90


On Thu, Jan 16, 2020 at 6:55 PM Bastiaan Visser <basti...@msbv.nl> wrote:

> I would definitely go for Nautilus. there are quite some
> optimizations that went in after mimic.
>
> Bluestore DB size usually ends up at either 30 or 60 GB.
> 30 GB is one of the sweet spots during normal operation. But during
> compaction, ceph writes the new data before removing the old, hence the
> 60GB.
> Next sweetspot is 300/600GB. any size between 60 and 300 will never be
> unused.
>
> DB Usage is also dependent on ceph usage, object storage is known to use a
> lot more db space than rbd images for example.
>
> Op do 16 jan. 2020 om 17:46 schreef Dave Hall <kdh...@binghamton.edu>:
>
>> Hello all.
>>
>> Sorry for the beginner questions...
>>
>> I am in the process of setting up a small (3 nodes, 288TB) Ceph cluster
>> to store some research data.  It is expected that this cluster will grow
>> significantly in the next year, possibly to multiple petabytes and 10s of
>> nodes.  At this time I'm expected a relatively small number of clients,
>> with only one or two actively writing collected data - albeit at a high
>> volume per day.
>>
>> Currently I'm deploying on Debian 9 via ceph-ansible.
>>
>> Before I put this cluster into production I have a couple questions based
>> on my experience to date:
>>
>> Luminous, Mimic, or Nautilus?  I need stability for this deployment, so I
>> am sticking with Debian 9 since Debian 10 is fairly new, and I have been
>> hesitant to go with Nautilus.  Yet Mimic seems to have had a hard road on
>> Debian but for the efforts at Croit.
>>
>>    - Statements on the Releases page are now making more sense to me,
>>    but I would like to confirm that Nautilus is the right choice at this 
>> time?
>>
>> Bluestore DB size:  My nodes currently have 8 x 12TB drives (plus 4 empty
>> bays) and a PCIe NVMe drive.  If I understand the suggested calculation
>> correctly, the DB size for a 12 TB Bluestore OSD would be 480GB.  If my
>> NVMe isn't big enough to provide this size, should I skip provisioning the
>> DBs on the NVMe, or should I give each OSD 1/12th of what I have
>> available?  Also, should I try to shift budget a bit to get more NVMe as
>> soon as I can, and redo the OSDs when sufficient NVMe is available?
>>
>> Thanks.
>>
>> -Dave
>> _______________________________________________
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>> ceph-users@lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
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