Good Morning --

I'm curious about the CPU hit and overall throughput of VTL vs
DSU or DSSU backups.  How many concurrent backups can run
from a single server?  The most I can run on my servers with DSUs
is 10 per server.

--kathy

> To: "Paul Keating" <pkeating AT bank-banque-canada DOT ca>
> Cc: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] on the subject of disk based backups....
> From: andrew.x.smith AT jpmchase DOT com
> Date: Thu, 23 Mar 2006 15:59:33 +0000
>
> This is a multipart message in MIME format.
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>
> Yeah, for me the biggest weakness of the NBU DSSUs.
>
>
>
>
>
> "Paul Keating" <pkeating AT bank-banque-canada DOT ca>
> 23/03/2006 15:48
>
>
>         To:     <andrew.x.smith AT jpmchase DOT com>
>         cc:     <veritas-bu AT mailman.eng.auburn DOT edu>
>         Subject:        RE: [Veritas-bu] on the subject of disk based 
> backups....
>
>
> excellent info...Now that you mention it....my one small DSSU I have
> configured to offload to a specific tape pool, so I should have known
> that.
> That definately sways me in the direction of VTL then.
> -----Original Message-----
> From: andrew.x.smith AT jpmchase DOT com [mailto:andrew.x.smith AT jpmchase 
> DOT com]
> Sent: March 23, 2006 8:30 AM
> To: Paul Keating
> Cc: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] on the subject of disk based backups....
>
>
> Hi Paul,
>
>   from my experience what you say about DSSU is incorrect, a single DSSU
> cannot stage the data off to multiple tape tape pools - if you have a
> requirement to stage to different tape pools you need to have a at least
> one DSSU per tape pool,
>
>                 cheers Andy.
>
>
>
>
>
> "Paul Keating" <pkeating AT bank-banque-canada DOT ca>
> Sent by: veritas-bu-admin AT mailman.eng.auburn DOT edu
> 23/03/2006 13:05
>
>         To:        <veritas-bu AT mailman.eng.auburn DOT edu>
>         cc:
>         Subject:        [Veritas-bu] on the subject of disk based
> backups....
>
>
>
> I'm also interested in thoughts regarding VTL vs DSSU.
> DSSU interests me mostly because I can write multiple jobs at once without
> any regard for tape pool, mpx or not, retention, etc.....
> ...then it all gets sorted out to appropriate tapes during the destaging
> VTL still presents itself to NBU as a tape, so each virtual tape drive
> must be licensed with Veritas, in additional to the physical tape drives
> (unless the VTL is run inline, though there could be issues there
> regarding estimated compression, etc.)
> Just a couple things off the top of my head.
> Just wondering who is using DSSU, adn who is using VTL, adn why you made
> that choice....ie.what were the key requirements for your environment that
> made one option better than the other.
> Paul
>
>