[Gluster-users] gluster Performance

[Jens Nauber | tyclipso.net]

Hi Arnold,

you are right that comparing gluster against a local filesystem is quite unfair. We just used the iozone results to get a number to compare against.

What concerns us most is the FINODELK value in gluster profile listing, which has a great latency. What does FINODELK mean and is it something we should be concerned about?

So what would be the best use case for gluster in a system with small/medium and often accessed files?

Thank you very much

Jens

Am 09.05.2012 um 11:35 schrieb Arnold Krille:

> On Wednesday 09 May 2012 11:01:00 Jens Nauber | tyclipso. net wrote:
>> we have set up a replicated gluster volume on 3 glusterservers, 2 of them
>> act as well as gluster clients using NFS-Mode.
>> 
>> It seems we have a performance problem especially in read access, compared
>> by Iozone-Test for GlusterFS and local filesystem (testfiles attached)
> 
> Comparing a network-filesystem to a local filesystem is a bit unfair, isn't it?
> 
> You "think" reading happens via local disk, but actually reading happens 
> across the network when you use nfs-mount.
> Even when you use the fuse-mount locally, you still have a userspace-component 
> (which has only a very little influence). And while reading of big contents all 
> happens locally and is thus fast, accessing files (small or big, read or write) 
> has an overhead as the attributes of the remote bricks are checked too to see 
> if the volume is consistent and trigger a self-heal if needed. So while 
> reading big files from local fuse-mount is fast, reading many small files still 
> has the network-penalty of any distributed and/or replicated system.
> 
> A better comparison is kernel-nfs against gluster with its userspace-nfs.
> And maybe also compare gluster to moosefs or ceph or lustre or any fs above 
> drbd...
> 
> Have fun,
> 
> Arnold_______________________________________________
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> Gluster-users at gluster.org
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