Veritas-bu

[Veritas-bu] Question regarding available tapes.

2005-12-15 20:15:34
Subject: [Veritas-bu] Question regarding available tapes.
From: dean.deano AT gmail DOT com (Dean)
Date: Fri, 16 Dec 2005 12:15:34 +1100
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There's something I have always wondered about but never got around to
testing. Does the "kbytes" field from bpmedialist show backups that have
expired, but are still physically on the tape?

In other words, if I have a 400GB tape that was FULL, but now all files hav=
e
expired except for the very last 1GB backup image (so the tape is still
effectively FULL), will bpmedialist show 1GB or 400GB ??

- Dean
On 12/16/05, Piszcz, Justin <jpiszcz AT servervault DOT com> wrote:
>
> So that is the amount ON the tape not remaining, ok, thanks!
>
> -----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 =3D 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.
>
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>

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There's something I have always wondered about but never got around to test=
ing. Does the &quot;kbytes&quot; field from bpmedialist show backups that h=
ave expired, but are still physically on the tape?<br><br>In other words, i=
f I have a 400GB tape that was FULL, but now all files have expired except =
for the very last 1GB backup image (so the tape is still effectively FULL),=
 will bpmedialist show 1GB or 400GB ??
<br><br>- Dean<br><div><span class=3D"gmail_quote">On 12/16/05, <b class=3D=
"gmail_sendername">Piszcz, Justin</b> &lt;<a href=3D"mailto:jpiszcz@serverv=
ault.com">jpiszcz AT servervault DOT com</a>&gt; wrote:</span><blockquote 
class=3D=
"gmail_quote" style=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0=
pt 0pt 0pt 0.8ex; padding-left: 1ex;">
So that is the amount ON the tape not remaining, ok, thanks!<br><br>-----Or=
iginal Message-----<br>From: <a href=3D"mailto:Mark.Donaldson AT cexp DOT 
com">Mar=
k.Donaldson AT cexp DOT com</a> [mailto:<a href=3D"mailto:Mark.Donaldson AT 
cexp DOT com"=
>
Mark.Donaldson AT cexp DOT com</a>]<br>Sent: Thursday, December 15, 2005 1:00 
PM<b=
r>To: Piszcz, Justin; <a href=3D"mailto:veritas-bu AT mailman.eng.auburn DOT 
edu">=
veritas-bu AT mailman.eng.auburn DOT edu</a><br>Subject: RE: [Veritas-bu] 
Question=
 regarding available tapes.
<br><br>bpmedialist will give you a count of how how many bytes are on the =
tape<br>(kbytes column):<br><br>&gt; bpmedialist -U<br>Server Host =3D XXXX=
XXXXXXXXX<br><br> id&nbsp;&nbsp;&nbsp;&nbsp; rl&nbsp;&nbsp;images&nbsp;&nbs=
p; allocated&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;last updated&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;density&nbsp;&nbsp;kbytes
<br>restores<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; vimages&nbsp;&nbsp; expiration&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; last r=
ead&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;------- STATUS<br>-=
------&gt;<br>-------------------------------------------------------------=
-----------<br>----<br>----<br>004526&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp;=
310&nbsp;&nbsp; 08/21/2005 03:40&nbsp;&nbsp;12/11/2005 06:36&nbsp;&nbsp;hca=
rt2
<br>61698920<br>0<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MPX&nbsp;&nbsp; 01/11/2006 06:36&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;N/A<br><br>004696&nbsp;&nbsp; 3&nbsp;&nb=
sp;&nbsp;&nbsp;874&nbsp;&nbsp; 11/20/2005 02:37&nbsp;&nbsp;12/12/2005 02:33=
&nbsp;&nbsp;hcart2<br>318870566<br>0<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MPX&nbsp;&nbsp; 01/12/2006=
 02:33&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;N/A<br><br>004801&nbs=
p;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 32&nbsp;&nbsp; 11/15/2005 19:54&nbsp;&nb=
sp;11/15/2005 19:55&nbsp;&nbsp;hcart2
<br>81122987<br>0<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MPX&nbsp;&nbsp; 01/16/2006 19:55&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;N/A<br><br>005165&nbsp;&nbsp; 6&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;6&nbsp;&nbsp; 06/15/2005 19:33&nbsp;&nbsp;06/15/=
2005 19:33&nbsp;&nbsp;hcart2<br>19992648<br>2<br>&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MPX&nbsp;&nbsp; 0=
6/15/2006 19:33&nbsp;&nbsp;07/11/2005 15:52<br><br>
005265&nbsp;&nbsp; 3&nbsp;&nbsp; 1874&nbsp;&nbsp; 06/10/2005 16:54&nbsp;&nb=
sp;12/11/2005 06:01&nbsp;&nbsp;hcart2<br>557969356<br>0<br>&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MPX&nbs=
p;&nbsp; 01/11/2006 07:29&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;N/=
A<br><br>After that, you're starting to guess.&nbsp;&nbsp;Because the amoun=
t of bytes per<br>tape<br>
can vary by the compressibilty of the data, the total amount of bytes<br>ac=
tually stored on the tape can vary.&nbsp;&nbsp;The closest you can do is<br=
>calculate<br>some sort of average compression ratio by looking at full tap=
es, then
<br>estimate based on that for your non-full tapes. Personally, I'd do this=
<br>by<br>volume pool as my compressibility is going to vary a lot by data =
source.<br><br><br>HTH - M<br><br><br>-----Original Message-----<br>From:=
=20
<a href=3D"mailto:veritas-bu-admin AT mailman.eng.auburn DOT 
edu">veritas-bu-admin=
@mailman.eng.auburn.edu</a><br>[mailto:<a href=3D"mailto:veritas-bu-admin@m=
ailman.eng.auburn.edu">veritas-bu-admin AT mailman.eng.auburn DOT edu</a>]On 
Behal=
f Of Piszcz,
<br>Justin<br>Sent: Thursday, December 15, 2005 10:40 AM<br>To: <a href=3D"=
mailto:veritas-bu AT mailman.eng.auburn DOT edu">veritas-bu AT 
mailman.eng.auburn DOT edu=
</a><br>Subject: [Veritas-bu] Question regarding available tapes.<br><br>
<br>Hello,<br><br>I can easily see how many scratch tapes, those that have =
not been<br>written to<br>yet.&nbsp;&nbsp;However, I probably have several =
tapes that are currently not<br>fully<br>filled up, scratch tapes that had =
a few fragments written to it.&nbsp;&nbsp;Is
<br>there<br>anyway to determine how full the tapes are?<br><br>Justin.<br>=
<br>_______________________________________________<br>Veritas-bu maillist&=
nbsp;&nbsp;-&nbsp;&nbsp;<a href=3D"mailto:Veritas-bu AT mailman.eng.auburn DOT 
edu=
">Veritas-bu AT mailman.eng.auburn DOT edu
</a><br><a href=3D"http://mailman.eng.auburn.edu/mailman/listinfo/veritas-b=
u">http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu</a><br></block=
quote></div><br>

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