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Hi Folks, I just joined this list and am new to Linux
clustering. I’ve setup several RHEL4u5 (AS) clusters in our lab to
do some performance testing with our own applications, but their underpinning
is just Red Hat Cluster Services and GFS on top of some iSCSI arrays
(StoreVault and EqualLogic). When I run IOZONE throughput tests comparing a single, local
SAS disk (146GB, 2.5”, 10K-RPM) on the onboard Dell PERC 5/i controller versus
an NFS-mounted volume versus a GFS volume on an iSCSI LUN…the results are
not particularly surprising, and they actually show the GFS volumes to be the
best performer in random read and random write, and a strong player overall. Our application performance, however, really suffers with
GFS. I have seen numerous pointers to GFS performance tuning through the “gfs_tool
setttune” parameters, but no clear guidance on what the parameters are
and how one might know what direction to move them in based on run data. Another thing we’ve noticed after running stress tests
with our application is that cluster nodes, and the clustering management components
themselves (like ricci, clustat) and filesystem tools (like df and du) start
hanging, we get system instability. Rebooting things clears it up. Has anyone else experienced this, and do you have any
guidance or advice? We’re running the native iSCSI components over
a shared GbE connection, which I know is not optimal for performance, but I can
see that the network ports are not even close to heavily used. Could the
software iSCSI initiator be contributing to this? Who is using native iSCSI on a simple GbE port as we are and
who has experience using iSCSI HBAs and/or TOEs and/or Fibre Channel for
interconnect rather than iSCSI? Thanks for any help or insight you can offer. Cheers, - K -- Kamal Jain kjain@xxxxxxxxxxxxxxxxxxx +1 978.893.1098 (office) +1 978.726.7098 (mobile) Auraria Networks, Inc. 85 Swanson Road, Suite 120 Boxborough, MA 01719 USA www.aurarianetworks.com |
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