I am also interested to see any existing comparison between these two
clusters.
I am specifically interested in the performance of their cluster
mirrored volumes.
Here below is some performance test data I collected. (take it at your
own risk)
The VERITAS test configuration include two nodes cluster, a VG (Volume
Group) which consists of two physical disks,
and two LV (logical volumes) from this VG. One LV with cluster-striped
attributes, the other LV
with cluster-mirrored attributes. The IOMETER (sequential IO) IOPS data
follows:
IOsize 512B 4K 16K
32K
Striped-read 20383 33845 12381
6226
Mirrored-read 22711 33934 11769
6080
Striped-write 10820 16711 8299
4817
Mirrored-write 9626 9283 4428
2600
The VERITAS test data looks as expected to me, for example, some
expected overhead for mirrored write,
and in general the IOPS number looks normal to me.
The RedHat cluster also include two nodes cluster. Two VGs, one VG is
local and the other VG with cluster property.
Each VG has three disks, and two LVs, the striped LV and the mirrored
LV. Its IOMETER (sequential IO) data follows:
IOsize 512B 4K 16K
32K
Local-Striped-read 9070 7717 3795
3009
cluster-Striped-read 9180 7751 4686
3257
Local-mirrored-read 8724 7506 4922
3398
cluster-Mirrored-read 331 332 332
332 <<<< why ?
Local-Striped-write 3711 3404 2626
1989
Local-Mirrored-write 331 331 331
329 <<< why ?
Does anyone know why the significant "read IO" performance degradation
on cluster-mirrored LV,
and the write IO drop on local-mirrored LV ?
The RedHat component versions are:
[root@linux-cluster1 sbin]# ccs_tool -V
ccs_tool DEVEL.1170370189 (built Feb 21 2007 15:11:13)
Copyright (C) Red Hat, Inc. 2004 All rights reserved.
[root@linux-cluster1 sbin]# cman_tool version
5.0.1 config 20
[root@linux-cluster1 sbin]# lvm version
Logging initialised at Wed Apr 11 10:46:29 2007
Set umask to 0077
WARNING: Ignoring duplicate config node: library_dir (seeking
library_dir)
Loaded external locking library liblvm2clusterlock.so
LVM version: 2.02.18-cvs (2007-01-11)
Library version: 1.02.14-cvs (2007-01-07)
Driver version: 4.5.0
Wiping internal VG cache
Is there a fix to the mirrored-LV performance in newer releases ?
Thanks,
-ChiiShing
-----Original Message-----
Date: Wed, 11 Apr 2007 09:24:48 +0200 (CEST)
From: laurent <laule75@xxxxxxxx>
Subject: Veritas Cluster Suite VS Redhat CLuster Suite
To: linux-cluster@xxxxxxxxxx
Message-ID: <182044.18633.qm@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I'm about to start an exhaustive study on the Veritas Cluster Suite and
the Redhat Cluster Suite in order to compare their functionalities and
their performances The objective of this comparison is to determine our
future production Cluster environment.
As I don"t want to reinvent the wheel, are you aware of any existing
study about this subject ?
Any help would be greatly appreciated.
Kind regards
Laurent
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