[Gluster-users] Looking for use cases / opinions

[Serkan Çoban]

Hi, I am using 26x8TB disks per server. There are 60 servers in gluster cluster.
Each disk is a brick and configuration is 16+4 EC, 9PB single volume.
Clients are using fuse mounts.
Even with 1-2K files in a directory, ls from clients takes ~60 secs.
So If you are sensitive to metadata operations, I suggest another approach...


On Wed, Nov 9, 2016 at 1:05 PM, Frank Rothenstein
<f.rothenstein at bodden-kliniken.de> wrote:
> As you said you want to have 3 or 4 replicas, so i would use the zfs
> knowledge and build 1 zpool per node with whatever config you know is
> fastest on this kind of hardware and as safe as you need (stripe,
> mirror, raidz1..3 - resilvering zfs is faster than healing gluster, I
> think) . 1 node -> 1 brick (per gluster volume).
>
> Frank
> Am Dienstag, den 08.11.2016, 19:19 +0000 schrieb Thomas Wakefield:
>> We haven’t decided how the JBODS would be configured.  They would
>> likely be SAS attached without a raid controller for improved
>> performance.  I run large ZFS arrays this way, but only in single
>> server NFS setups right now.
>> Mounting each hard drive as it’s own brick would probably give the
>> most usable space, but would need scripting to manage building all
>> the bricks.  But does Gluster handle 1000’s of small bricks?
>>
>>
>>
>> > On Nov 8, 2016, at 9:18 AM, Frank Rothenstein <f.rothenstein at bodden
>> > -kliniken.de> wrote:
>> >
>> > Hi Thomas,
>> >
>> > thats a huge storage.
>> > What I can say from my usecase - dont use Gluster directly if the
>> > files
>> > are small. I dont know, if the file count matters, but if the files
>> > are
>> > small (few KiB), Gluster takes ages to remove for example. Doing
>> > the
>> > same in a VM with e.g. ext4 disk on the very same Gluster gives a
>> > big
>> > speedup.
>> > There are many options for a new Gluster volume, like Lindsay
>> > mentioned.
>> > And there are other options, like Ceph, OrangeFS.
>> > How do you want to use the JBODs? I dont think you would use every
>> > single drive as a brick... How are these connected to the servers?
>> >
>> > Im only dealing with about 10TiB Gluster volumes, so by far not at
>> > your
>> > planned level, but I really would like to see some results, if you
>> > go
>> > for Gluster!
>> >
>> > Frank
>> >
>> >
>> > Am Dienstag, den 08.11.2016, 13:49 +0000 schrieb Thomas Wakefield:
>> > > I think we are leaning towards erasure coding with 3 or 4
>> > > copies.  But open to suggestions.
>> > >
>> > >
>> > > > On Nov 8, 2016, at 8:43 AM, Lindsay Mathieson <lindsay.mathieso
>> > > > n at gm
>> > > > ail.com> wrote:
>> > > >
>> > > > On 8/11/2016 11:38 PM, Thomas Wakefield wrote:
>> > > > > High Performance Computing, we have a small cluster on campus
>> > > > > of
>> > > > > about 50 linux compute servers.
>> > > > >
>> > > >
>> > > > D'oh! I should have thought of that.
>> > > >
>> > > >
>> > > > Are you looking at replication (2 or 3)/disperse or pure
>> > > > disperse?
>> > > >
>> > > > --
>> > > > Lindsay Mathieson
>> > > >
>> > >
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> BODDEN-KLINIKEN Ribnitz-Damgarten GmbH
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