ADSM-L

Re: Tivoli DB limit

2006-04-21 08:55:26
Subject: Re: Tivoli DB limit
From: "Smith, I (Ian)" <Ian.Smith AT RABOBANK DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Fri, 21 Apr 2006 13:44:25 +0100
 
What is the OS?

Could Journaling or some form of, be helpful here?

_____________________________
Ian Smith
SAN/TSM Specialist
IT Infrastructure
Rabobank International
Thames Court, One Queenhithe
London EC4V 3RL
t: +44 (0)20 7809 3046
f: +44 (0)20 7809 3599
m: +44 (0)7843 689914
Mailto: ian.smith AT rabobank DOT com


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Richard Sims
Sent: 21 April 2006 13:38
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Tivoli DB limit

On Apr 20, 2006, at 5:28 PM, Gaurav Marwaha wrote:

>       We have a huge file system with about 30 to 50 million files to
be 
> backed up, the incremental backup does the job, but takes too long to 
> complete, out of these 50 million files, only 20000 or so actually 
> change. So the scanning runs sometimes into 24 hour window and the 
> next scheduled backup starts without actually completing the previous 
> one.

Gaurav -

You may be new to TSM and not realize that this question has been
pursued many times in this forum. You can best review past postings at
www.mail-archive.com/adsm-l AT vm.marist DOT edu/ .

This is formally known as the "Many small files" problem. See that entry
in http://people.bu.edu/rbs/ADSM.QuickFacts or http://
www.tsmwiki.com/tsmwiki for collected information.

> Someone tells me that the Tivoli DB can take only 100million objects 
> for tracking and filist might not be a correct way to do it. He says 
> there is DB2 lite running behind TSM and that has this limit?

Your information source is faulty. I'd advise more authoritative
references, as found on the IBM Web site and in documented referenced in
mailing list postings.

It is more typically the case that the client is "limited" in running
out of the amount of memory needed to accommodate the Active files list
it gets from the server at the start of Incremental backup processing.
It behooves a client which serves a highly elevated data complement like
this to run a 64-bit version of the operating system for that platform,
to best deal with the volumes of metadata that it needs to be able to
handle. This provides the expanse needed for holding such arrays in
memory.

  Richard Sims
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