Veritas-bu

[Veritas-bu] Question regarding available tapes.

2005-12-15 13:45:20
Subject: [Veritas-bu] Question regarding available tapes.
From: pkeating AT bank-banque-canada DOT ca (Paul Keating)
Date: Thu, 15 Dec 2005 13:45:20 -0500
Aptare Storage Console has a Media Forecasting Dashboard...that does
this...sorta.

> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu 
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of 
> Piszcz, Justin
> Sent: December 15, 2005 1:38 PM
> To: Mark.Donaldson AT cexp DOT com; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Question regarding available tapes.
> 
> 
> Basically, I wonder if NetBackup 6.0 will say, you will run 
> out of tapes
> in 74 hours, you have 6 tapes left.
> 
> Know any software out there that might do this? :)
> 
> -----Original Message-----
> From: Mark.Donaldson AT cexp DOT com [mailto:Mark.Donaldson AT cexp DOT com] 
> Sent: Thursday, December 15, 2005 1:35 PM
> To: Piszcz, Justin; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Question regarding available tapes.
> 
> Yeah - text stuff is pretty squishy - it'll get down there - I've seen
> much
> more than the average 2:1.  My database backups only get 
> about 1.3:1 or
> so,
> not very compressible.  
> 
> It varies a lot by data type.
> 
> ...and, yes, it's the amount *on* the tape - but that's disk 
> bytes sent
> to
> that tape, not tape bytes occupied.  If you see 100G reported as being
> on
> the tape, it may only be taking up 50GB of actual tape media.  Like I
> said,
> the amount remaining, given compression, is very hard to calculate.
> 
> -M
> 
> -----Original Message-----
> From: Piszcz, Justin [mailto:jpiszcz AT servervault DOT com]
> Sent: Thursday, December 15, 2005 11:18 AM
> To: Mark.Donaldson AT cexp DOT com; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Question regarding available tapes.
> 
> 
> Interesting though, I use LTO2 which are 200/400GB, but with
> compression, it ranges from 400-500gb on some tapes.
> 
> -----Original Message-----
> From: Mark.Donaldson AT cexp DOT com [mailto:Mark.Donaldson AT cexp DOT com] 
> Sent: Thursday, December 15, 2005 1:00 PM
> To: Piszcz, Justin; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Question regarding available tapes.
> 
> bpmedialist will give you a count of how how many bytes are 
> on the tape
> (kbytes column):
> 
> > bpmedialist -U
> Server Host = XXXXXXXXXXXXX
> 
>  id     rl  images   allocated        last updated      
> density  kbytes
> restores
>            vimages   expiration       last read         
> <------- STATUS
> ------->
> --------------------------------------------------------------
> ----------
> ----
> ----
> 004526   3    310   08/21/2005 03:40  12/11/2005 06:36  hcart2
> 61698920
> 0
>               MPX   01/11/2006 06:36        N/A
> 
> 004696   3    874   11/20/2005 02:37  12/12/2005 02:33  hcart2
> 318870566
> 0
>               MPX   01/12/2006 02:33        N/A
> 
> 004801   4     32   11/15/2005 19:54  11/15/2005 19:55  hcart2
> 81122987
> 0
>               MPX   01/16/2006 19:55        N/A
> 
> 005165   6      6   06/15/2005 19:33  06/15/2005 19:33  hcart2
> 19992648
> 2
>               MPX   06/15/2006 19:33  07/11/2005 15:52
> 
> 005265   3   1874   06/10/2005 16:54  12/11/2005 06:01  hcart2
> 557969356
> 0
>               MPX   01/11/2006 07:29        N/A
> 
> After that, you're starting to guess.  Because the amount of bytes per
> tape
> can vary by the compressibilty of the data, the total amount of bytes
> actually stored on the tape can vary.  The closest you can do is
> calculate
> some sort of average compression ratio by looking at full tapes, then
> estimate based on that for your non-full tapes. Personally, 
> I'd do this
> by
> volume pool as my compressibility is going to vary a lot by 
> data source.
> 
> 
> HTH - M
> 
> 
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Piszcz,
> Justin
> Sent: Thursday, December 15, 2005 10:40 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Question regarding available tapes.
> 
> 
> Hello,
>  
> I can easily see how many scratch tapes, those that have not been
> written to
> yet.  However, I probably have several tapes that are currently not
> fully
> filled up, scratch tapes that had a few fragments written to it.  Is
> there
> anyway to determine how full the tapes are?
>  
> Justin.
> 
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