[Gluster-users] Advice for sizing a POC

Serkan Çoban cobanserkan at gmail.com
Sat Feb 18 13:14:36 UTC 2017

With 1GB/file size you should definitely try JBOD with disperse volumes.
Gluster can easily get 1GB/per node network throughput using disperse volumes.

We use 26 disks/node without problems and planning to use 90 disk/node.

I don't think you'll need SSD caching for sequential read heavy workload...

Just test the workload with different disperse configurations to find
the optimum for your workload.

On Fri, Feb 17, 2017 at 7:54 PM, Jake Davis <jake at imapenguin.com> wrote:
> Greetings, I'm trying to spec hardware for a proof of concept. I'm hoping
> for a sanity check to see if I'm asking the right questions and making the
> right assumptions.
> I don't have real numbers for expected workload, but for our main use case,
> we're likely talking a few hundred thousand files, read heavy, with average
> file size around 1 GB. Fairly parallel access pattern.
> I've read elsewhere that the max recommended disk count for a RAID6 array is
> twelve. Is that per node, or per brick? i.e. if I have a number of 24 or 36
> disk arrays attached to a single node, would it make sense to divide the
> larger array into 2 or 3 bricks with 12 disk stripes, or do a want to limit
> the brick count to one per node in this case?
> For FUSE clients, assuming one 12 disk RAID6 brick per node, in general, how
> many nodes do I need in my cluster before I start meeting/exceeding the
> throughput of a direct attached raid via NFS mount?
> RAM; is it always a case of the more, the merrier? Or is there some rule of
> thumb for calculating return on investment there?
> Is there a scenario were adding a few SSD's to a node can increase the
> performance of a spinning disk brick by acting as a read cache or some such?
> Assuming non-ZFS.
> I've read that for highly parallel access, it might make more sense to use
> JBOD with one brick per disk. Is that advice file size dependent? And What
> question do I need to ask myself to determine how many of these single disk
> bricks I want per-node?
> Many thanks!
> -Jake
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