Paul, Bastiaan,
Thank you for your responses and for alleviating my concerns
about Nautilus. The good news is that I can still easily move up
to Debian 10. BTW, I assume that this is still with the 4.19
kernel?
Also, I'd like to inject additional customizations into my Debian configs via ceph-ansible - certain sysctls, ntp servers, and some additional packages. Is anybody doing that, and could you share any hints on where to configure it?
Thanks.
-Dave
Dave Hall Binghamton University kdhall@xxxxxxxxxxxxxx 607-760-2328 (Cell) 607-777-4641 (Office)
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
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On Thu, Jan 16, 2020 at 6:55 PM Bastiaan Visser <bastiaan@xxxxxxx> 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 <kdhall@xxxxxxxxxxxxxx>:
_______________________________________________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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