From: linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Frazier, Darrell USA CRC (Contractor)
Sent: Monday, December 18, 2006 8:37 AM
To: 'linux clustering'
Subject: RE: GFS performance
Thanx a lot Bob for the info. I am in the process of swapping things out to see if that changes things. I am wondering however why performance is even on the OS side (dd, cp, etc, to the GFS filesystem), but not with Clusterware. Interesting.
-----Original Message-----
From:
linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx]
On Behalf Of Robert Peterson
Sent: Friday, December 15,
2006 3:33 PM
To: linux clustering
Subject: Re: GFS performance
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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