We have 8 drives per VTL.  That number was chosen because the server would not 
be able to sustain the throughput needed with more drives to keep the physical 
tapes drives busy.
With our new hardware we are going to 16 drives which should be the upper limit 
of what the VTL can do due to disk contention and a pretty fast server.  We may 
run more if 16 drives do not keep the VTL busy.
Our goal is to have as many drives as we can and still not starve the physical 
drives.
If you are not going to continue using disk pools, that changes things and is 
beyond what I have done.


Andy Huebner
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Gill, Geoffrey L.
Sent: Wednesday, July 15, 2009 5:11 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] VTL setups

For those with VTL's can you give me an idea of how many tape drives you
have defined? I'm listening to the vendors setup ideas and it seems to
me the 10 tape drives they want to define for TSM sure seems like a low
number when you take into consideration all the things that need to be
done and keeping in mind the disk storage pool goes away and every
backup now goes to tape.

 

I'd sure like to hear what sort of things you had to do to make things
run smooth. I didn't recommend getting the one we have and certainly
haven't heard anything good about it here or elsewhere.

 

Thanks,

 

Geoff Gill 
TSM Administrator 
PeopleSoft Sr. Systems Administrator 
SAIC M/S-B1P 
(858)826-4062 (office)

(858)412-9883 (blackberry)
Email: geoffrey.l.gill AT saic DOT com 

 


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