Veritas-bu

[Veritas-bu] 9840 tape drive question

2003-08-04 07:32:22
Subject: [Veritas-bu] 9840 tape drive question
From: jack.l.forester AT lmco DOT com (Jack L. Forester)
Date: Mon, 04 Aug 2003 07:32:22 -0400
I'll second that on the 9940B.  We're running 9940A drives here and we
are finishing up an eval of 9940Bs.  I was getting 60MB/sec
consistently, and depending on the compressibility of the data, I was
able to put between 800GB to 3.2TB on a single tape.

On Thu, 2003-07-31 at 11:12, Quarantine wrote:
> To echo Johnny:  I sure wish I had the capacity of the 9940B, and FC is
> definitely the way to go.
> 
> Matt
> 
> -----Original Message-----
> From: Johnny Oestergaard [mailto:joe AT spamcop DOT net] 
> Sent: Thursday, July 31, 2003 9:41 AM
> To: Letnes, David G.; 'veritas-bu AT mailman.eng.auburn DOT edu'
> Subject: Re: [Veritas-bu] 9840 tape drive question
> 
> I don't think you will get that performance out of the drives in a mixed 
> installation.
> On very large files it should work, but on normal fileservers you will have 
> to have a lot of multiplexing to get it.
> 
> If you don't need the extremely fast loadtime and positioning of the 9840B 
> drives I would look into 9940B. They are faster (except for load and 
> positioning) and they can hold a lot more data per tape.
> 
> We use our 9940B's in a windows only installation, but if you have a lot of 
> data I would look into using Solaris for the master and media servers.
> 
> I would also go for a FC only solution.
> 
> /johnny
> 
> At 17:18 30-07-2003 -0500, Letnes, David G. wrote:
> 
> >   I am trying to calculate how many drives it will take to backup our data
> >for a new silo we are pricing out.  The tape drives will be 9840's and I am
> >using the max speed of 18 MBps which is about 65 Gig an hour?    The
> formula
> >I am using looks like this...
> >
> >
> >
> >                            Backup Data Volume
> >                      ------------------------------------------
> >= How many drives you will need
> >                 Tape drive throughput    *    backup window
> >
> >
> >The speed I rated the 9840 tape drive; is that about 65 Gig an hour?
> >
> >Are there any other formulas people use to determine how many tape drives
> >you will need?
> >
> >Thanks
> >David
> >
> >
> >
> >
> >_______________________________________________
> >Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
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> 
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-- 
Jack L. Forester, Jr.
Sr. UNIX Systems Administrator
Lockheed Martin Information Technology
(304) 625-3946



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