Veritas-bu

[Veritas-bu] Performance: Single server, multiple jukeboxes?

2004-02-12 11:48:19
Subject: [Veritas-bu] Performance: Single server, multiple jukeboxes?
From: Mark.Donaldson AT experianems DOT com (Donaldson, Mark)
Date: Thu, 12 Feb 2004 09:48:19 -0700
To answer your last question.  You can associate a policy/class with a
robot.  You do it by creating storage units specific to each robot (a
requirement - STU's can not span robots) then assigning classes (or even a
schedule) with a specific storage unit.

-M

-----Original Message-----
From: Adam Porter [mailto:porter AT marine.rutgers DOT edu]
Sent: Thursday, February 12, 2004 9:07 AM
To: nantel AT ecopiabio DOT com
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Performance: Single server, multiple
jukeboxes?


Thanks all for writing!  It's comforting to hear others are driving 
numerous devices and still have headroom.

Mathieu Nantel wrote:

> Are you really hoping to write at 64-72MB/sec? We've got an M1500 with 2 

Maybe I'm naive in hoping to approach drive speed?  We're currently 
getting close to 10MB/sec (mix of small/large files, no database) on the 
2 DLT7000s over fast ethernet even on our ancient Sun Sparcserver 1000E 
with NBU 3.4.1.  So as far as I know, we're pretty efficient.  I was 
hoping to reach similar efficiency with the new jukebox over gigabit, 
but maybe this won't scale as well as I'm hoping?

> isn't exactly going to affect the machine too much. I don't assume it's 
> necessary to mention that you don't want to run your Ultra160 SDLTs on the

> same bus as your ??Ultra40?? DLTs since this will throttle everything to 
> ??Ultra40?? Make sure you have a gig of RAM, dual "decent" CPUs, and
that'll 
> be enough.

It is indeed necessary to mention this, thanks for doing so!  My 
(limited) understanding of the dual-channel SCSI controller (Adaptec 
39160) is that it would provide us 2 *independent* SCSI chains, each 
capable of 160MB/sec.  I definitely can't afford to be throttled to the 
slower jukebox capabilities of 10MB/sec though.  Do I need 2 separate 
controllers?

And finally, a software question:  With multiple robots on a single 
server, can you associate backup classes with a specific robot/jukebox?

Thanks!

-Adam


-- 
Adam Porter, Information Technology Department
Institute for Marine & Coastal Sciences, Rutgers University
porter AT marine.rutgers DOT edu, 732-932-6555 x510
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