ADSM-L

Tape Performance

2001-09-26 16:52:44
Subject: Tape Performance
From: clayton thompson <clayton AT USA DOT COM>
Date: Thu, 27 Sep 2001 04:34:18 +0800
I have a bunch of questions regarding tape drive performance and backup 
software.  We are planning to evaluate Tivoli Storage Manager and Veritas 
Netbackup.  The decision as to which one is going to be purchased is out of my 
hands.  I am however responsible for determining what tape hardware to 
purchase.  I am somewhat familiar with Tivoli Storage Manager, but do not have 
any experience with Veritas.

My first question is how does TSM and Veritas compare regarding tape usage.  
With TSM and its file level based granularity, it seems like the tape locate 
speeds would be one of the most important considerations.  The way I see it if 
you only have fast streaming performance, then sure your migrations and backups 
will be fast, but reclamation and file system recovery with the active versions 
of data spread across a tape will have poor performance.  Is this accurate?

Does Veritas ever run into similar situations during entire file system 
recovery?  Does Veritas have anything like reclamation?

Are there any reports that compare the various tape drives in 'real world' 
situations?

When you buy/evaulate new tape hardware for use with Tivoli Storage Manager, 
how do you determine the performance in a sandbox environment that would allow 
you to determine how well it will do once it is put into production?

I have the same question as above regarding a Veritas Netbackup environment.

And finally if there are no reports of 'real world' situations comparing the 
various tape drives, what types of sitations would you like to see (In case 
anyone is monitoring the listserv who can do something about this lack of 
information).

Clayton Thompson


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