[Gluster-users] Performance optimization tips Gluster 3.3? (small files / directory listings)

Fernando Frediani (Qube) fernando.frediani at qubenet.net
Thu Jun 7 10:10:03 UTC 2012

Sorry this reply won't be of any help to your problem, but I am too curious to understand how it can be even slower if monting using Gluster client which I would expect always be quicker than NFS or anything else.
If you find the reason port it back to the list and share with us please. I think this directory index issues has been reported already for systems with many files.



From: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of olav johansen
Sent: 07 June 2012 03:32
To: gluster-users at gluster.org
Subject: [Gluster-users] Performance optimization tips Gluster 3.3? (small files / directory listings)


I'm using Gluster 3.3.0-1.el6.x86_64, on two storage nodes, replicated mode (fs1, fs2)
Node specs: CentOS 6.2 Intel Quad Core 2.8Ghz, 4Gb ram, 3ware raid, 2x500GB sata 7200rpm (RAID1 for os), 6x1TB sata 7200rpm (RAID10 for /data), 1Gbit network

I've it mounted data partition to web1 a Dual Quad 2.8Ghz, 8Gb ram, using glusterfs. (also tried NFS -> Gluster mount)

We have 50Gb of files, ~800'000 files in 3 levels of directories (max 2000 directories in one folder)

My main problem is speed of directory indexes "ls -alR"  on the gluster mount takes 23 minutes every time.

It don't seem like any directory listing information cache, with regular NFS (not gluster) between web1<->fs1, this takes 6m13s first time, and 5m13s there after.

Gluster mount is 4+ times slower for directory indexing performance vs pure NFS to single server, is this as expected?
I understand there is a lot more calls involved checking both nodes but I'm just looking for a reality check regarding this.

Any suggestions of how I can speed this up?


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