Frazier, Darrell USA CRC (Contractor) wrote:
Hello guru's,
Interesting problem I am hoping someone on this forum has seen before,
and can give me pointers to what may be wrong. Here is the setup:
2 HP DL380 G4 systems with RHEL4U4
1 unmanaged switch (for Cluster interconnect and Oracle RAC
interconnect.)
Public network for Oracle NET and normal network traffic
RHCS4 using DLM locking protocol (three servers to keep GULM lock info
for a two node RAC seemed pretty wasteful)
GFS6.1
Oracle Clusterware (latest)
Oracle Database 10gR2
Fiber-Channel shared storage
Here is my issue:
I have set up a two-node Oracle 10gR2 RAC system with RHCS/GFS (OCFS2
was such a disappointment), and Oracle Clusterware. Everything on the
OS cluster level is good and fine.
Shortly after setting up the cluster and handing it over to the DBAs
to install Clusterware and Oracle RAC. They come to me saying that
they have uneven performance between the nodes. (Node one does
adatabase import in an hour whereas the same import on Node2 takes 10
hours)
I have been doing everything I can do on my side using various tools
to try to isolate the issue (protocol analysis, iostat, strace, dd to
do writes from both nodes to GFS, etc.) and I have been unable to
isolate the issue as performance is quite even on an OS level.
The cluster configuration has been ruled out by Redhat support as an
issue. (Yay for me and Redhat!)
I am hoping someone here has run into issues using Oracle Clusterware
on RHCS/GFS.
Thanx in advance
*Darrell J. Frazier*
Hi Darrell,
Well, it's possible you're running into this:
http://sources.redhat.com/cluster/faq.html#gfs_speed1
To rule that out, perhaps you could do the same sequence of events after
a complete cluster reboot,
for each node. It would be interesting to know if the speed factor changes.
It could be a number of other things, too, including hardware. You
could try swapping cables and
ports on the Ethernet and also the shared storage. By the way, I'm in
the process of adding a new
"GFS performance tuning" question to the cluster FAQ that may or may not
help. It should appear
in the FAQ soon, pending review by some of the developers here (I don't
want to post any
misinformation, so I'm having them review it).
Regards,
Bob Peterson
Red Hat Cluster Suite
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