Veritas-bu

[Veritas-bu] DLT tape longevity?]

2001-02-14 10:12:47
Subject: [Veritas-bu] DLT tape longevity?]
From: McMurphy, Tim Tim.McMurphy AT cdcgy DOT com
Date: Wed, 14 Feb 2001 08:12:47 -0700
Thanks. Now if we can just get those "tape leaders" to stop disconnecting!
We have had that happen several times.

-----Original Message-----
From: ysbrand bergman [mailto:ysbrand AT usa DOT net]
Sent: 14 February, 2001 8:58 AM
To: Veritas NBU
Subject: Re: [Veritas-bu] DLT tape longevity?]


This is what I got from Quantum:

Shelf life:
The tape media shelf life is more than 30 years. The environment is
specified
as 18°C to 28°C (68°F to 82°F) with 40% to 60% relative humidity
(non-condensing). The cartridge should be stored in its protective case to
keep out dust and contaminants. 

Usage life:

The DLT tape cartridges are specified at one million passes. In laboratory
tests, the media has been usable even after very high numbers of passes and
the media actually seems to improve with use. At one million passes the tape
should continue to function normally, unless it is being used in an
environment with heat, humidity or contamination levels beyond those
recommended.
A pass refers to a single movement of a section of the tape media across the
head assembly. The number of passes may be determined by the number of times
the cartridge is read or written "end to end". 

So in short you should be probably more worried regarding if you have still
the equipment available to read the tapes as opposed to if your tape is
still
readable.

Ysbrand


Miriam Ben-Haim <miriam AT techunix.technion.ac DOT il> wrote:
> On Mon, 12 Feb 2001, RYAN ANDERSON wrote:
> 
> >Do any of you have standards in place to determine how long a DLT tape
> >is good for? I have several DLT IV tapes which are a couple years old,
> >and admitedly I don't have a lot of problems with them, but I assume
> >they're usefulness will decline; I just don't know when.
> >
> >
> >RCA
> >--
> >Ryan C. Anderson        |   United Defense L.P.    
> >Unix Administrator      |   763.572.6684 (desk)
> >ryan_anderson AT udlp DOT com  |   952.235.9936 (pager)
> >_______________________________________________
> >Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> >http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> 
> I asked our H/W support people this question about our DLT7000 tapes and
> they said that officially (according to the producer) they are supposed
> to last many years. We've been able to use the old 8GB Exabyte tapes
> from 5-6 years ago, so I tend to believe it.
> 
> 
>       Miriam
> 
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  Miriam Ben-Haim                 E-mail: miriam AT technion.ac DOT il 
>  Unix Systems                    Phone : +972-4-8292177               
>  Taub Computer Center            Fax   : +972-4-8236212                
>  Technion - Israel Institute of Technology, Haifa 32000, ISRAEL        
>                                                                        
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
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