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System is running very slow

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Soontorn Vittayaprachsa_1
Occasional Visitor

System is running very slow

Hello there,

I've experienced that the member2 of the cluster slowly to response. The member1 is working as normal, when run tar command to create a tar file in the member1 in /etc directory, for instance, it took about few minutes, but doing the same in the member2 after half an hour the member2 still running the tar command.

Somebody out there can help me regarding the member2 working slowly.

Our system configured as cluster with OSF5.1A, ES45 single cpu, both hardware of member1 and member2 are the same, except member1 has two internal 18GB hard disks and memeber1 has only one 18GB hard disk.

Regards,
Soontorn
4 REPLIES
Hein van den Heuvel
Honored Contributor
Solution

Re: System is running very slow

Hmm, which node 'owns'the mount point?
Write, and specifically growing files are serialized through the owning node.
For things like tar, you might want to run at the right node, or relocate the ownership to the targetted node. I use the script below to help construct the relocate commands. (it does not execute anything).
You may also find performance improvements with the most recent Tru64 versions.

hth,
Hein.



#!/bin/perl
#
$this = `hostname`;
chop $this;
foreach (`cfsmgr -c`) {
$i=4 if (/^ Dom.*:\//);
next if ($i-- > 0);

if (/On = (.*$)/) {
$on=$1;
}
if (/Name = (\w*)/) {
$na=$1;
next if ($on =~ /member/);
next if ($na =~ /$this/);
print "cfsmgr -h $na -r -a SERVER=$this $on\n";
}
}
Joris Denayer
Respected Contributor

Re: System is running very slow

Soontorn,

You must check which member currently serves the root_domain.
All writes the cluster_root from the non-serving member will go to the serving member via the cluster interconnect and than to the disk.
So, what cluster interconnect do you use ?
Memory channel, Gigabit ethernet or 100Mbit ethernet

Run following command, to see the actual serving member.

# cfsmgr /

You could relocate the cluster_root to the other member with the command

# cfsmgr -a -r SERVER= /

Hope this helps

Joris
To err is human, but to really faul things up requires a computer
Joris Denayer
Respected Contributor

Re: System is running very slow

Hein,

Absolutely correct, Tru64 UNIX v5.1B would give some performance enhancements.
It also has the CFS load monitoring daemon that gives you advice for better management of the cluster filesystems.

Joris
To err is human, but to really faul things up requires a computer
Soontorn Vittayaprachsa_1
Occasional Visitor

Re: System is running very slow

Well the faster one own the mounted point.

Thanks for the answers and I'm now upgrading from 5.1a to 5.1b.

Soontorn