The few spikes/slowdowns I recall were during DB initialization but others
have commented about some backups/restores taking 3-4 times longer than
usual.  The CPU spikes are reported by hobbit/bigbrother, our monitoring
system.

Yes, this is a dedicated server. Nothing but TSM running !

Z



Andy Huebner <Andy.Huebner AT ALCONLABS DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
08/20/2007 03:47 PM
Please respond to
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


To
ADSM-L AT VM.MARIST DOT EDU
cc

Subject
Re: [ADSM-L] Multi-Core CPU usage on TSM Linux x86_64 server






What TSM processes are running during the spikes?  Is it a dedicated TSM
server?

For example, if expiration is running and your DB is configured well, I
would expect 100% CPU utilization.  On the other hand, if migration is
running and you are seeing 100% CPU, I would start looking for a
hardware or driver problem.

Andy Huebner
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Zoltan Forray/AC/VCU
Sent: Monday, August 20, 2007 2:37 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Multi-Core CPU usage on TSM Linux x86_64 server

I realize that some of this has been discussed before, but I can seem to
find a thread on it and management is looking for
recommendations/thoughts/feedback.

On our new, big, beefy Dell 2900 TSM server (8GB RAM, 2-Quad-Core Xeon
processors) , we are seeing some high CPU spikes and are wondering why.

Management wants to know, does the TSM server make good use of the
multi-core/cpu hardware?

Yes we realize that I/O is the main factor, especially with 225+
clients,
although the daily backup load is < 2TB)

This is TSM 5.4.0 x86_64 on RedHat 4.   Going to upgrade to 5.4.1 soon.

I have gone through all the various TSM tuning guides/slideshows and we
are set for all optimal/recommended values.  DBBuffsize is at 768MB
(some
books I see talk about 1/8 to 1/2 of the memory, not to exceed 1GB). The
database is divided into 20GB chunks.

----------------------------------------------------
Zoltan Forray
Virginia Commonwealth University
Office of Technology Services
University Computing Center
e-mail: zforray AT vcu DOT edu
voice: 804-828-4807


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