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Deiter,

You need to have:

How much data per client
What is your retention policy, 
What schedules - cum-incremental/ incremental (% of total data changed = I 
used 20% as a rule of thumb) and  full 
Frequency of each schedule...
Number of copies for each backup.

I treated each client as individual - so each client was allocated media 
according to it's size - I used to allocate min 1 tape per day per client 
if they wanted off-site too. You could become too technical and "group" 
all the incrementals together onto 1 tape, but then you do get broken 
media...and if u allocate exactly you won;t have any spares.

Also - at around $50 per tape - not too expensive....considering the risk 
of no recovery at all...

I used to have this in a Excel spreadsheet.


Good luck,

\_JdS_/







Deiter Scott <scottd AT HanoverDirect DOT com>
Sent by: veritas-bu-admin AT mailman.eng.auburn DOT edu
02/03/2006 13:56

 
        To:     veritas-bu AT mailman.eng.auburn DOT edu
        cc: 
        Subject:        [Veritas-bu] Tape calculator


Solaris 9 master/media server at 5.1 mp4
6 solaris clients
20 some windows clients 
storagetek robot using SDLT's
 
We have been asked to determine the amount of tapes needed to complete all 
our current backup schedules till the end of this year.
I wondered if any one else has accomplished this and would have any hints 
or tricks.


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<br><font size=2 face="sans-serif">Deiter,</font>
<br>
<br><font size=2 face="sans-serif">You need to have:</font>
<br>
<br><font size=2 face="sans-serif">How much data per client</font>
<br><font size=2 face="sans-serif">What is your retention policy, </font>
<br><font size=2 face="sans-serif">What schedules - cum-incremental/ 
incremental (% of total data changed = I used 20% as a rule of thumb) and 
&nbsp;full </font>
<br><font size=2 face="sans-serif">Frequency of each schedule...</font>
<br><font size=2 face="sans-serif">Number of copies for each backup.</font>
<br>
<br><font size=2 face="sans-serif">I treated each client as individual - so 
each client was allocated media &nbsp;according to it's size - I used to 
allocate min 1 tape per day per client if they wanted off-site too. You could 
become too technical and &quot;group&quot; all the incrementals together onto 1 
tape, but then you do get broken media...and if u allocate exactly you won;t 
have any spares.</font>
<br>
<br><font size=2 face="sans-serif">Also - at around $50 per tape - not too 
expensive....considering the risk of no recovery at all...</font>
<br>
<br><font size=2 face="sans-serif">I used to have this in a Excel 
spreadsheet.</font>
<br>
<br>
<br><font size=2 face="sans-serif">Good luck,</font>
<br>
<br><font size=2 face="sans-serif">\_JdS_/</font>
<br>
<br>
<br>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td>
<td><font size=1 face="sans-serif"><b>Deiter Scott &lt;scottd AT HanoverDirect 
DOT com&gt;</b></font>
<br><font size=1 face="sans-serif">Sent by: veritas-bu-admin AT 
mailman.eng.auburn DOT edu</font>
<p><font size=1 face="sans-serif">02/03/2006 13:56</font>
<br>
<td><font size=1 face="Arial">&nbsp; &nbsp; &nbsp; &nbsp; </font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; To: &nbsp; 
&nbsp; &nbsp; &nbsp;veritas-bu AT mailman.eng.auburn DOT edu</font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; cc: &nbsp; 
&nbsp; &nbsp; &nbsp;</font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; Subject: &nbsp; 
&nbsp; &nbsp; &nbsp;[Veritas-bu] Tape calculator</font></table>
<br>
<br>
<br><font size=3 color=#000080 face="Times New Roman">Solaris 9 master/media 
server at 5.1 mp4</font>
<br><font size=3 color=#000080 face="Times New Roman">6 solaris clients</font>
<br><font size=3 color=#000080 face="Times New Roman">20 some windows clients 
&nbsp;</font>
<br><font size=3 color=#000080 face="Times New Roman">storagetek robot using 
SDLT's</font>
<br><font size=3 color=#000080 face="Times New Roman">&nbsp;</font>
<br><font size=3 color=#000080 face="Times New Roman">We have been asked to 
determine the amount of tapes needed to complete all our current backup 
schedules till the end of this year.</font>
<br><font size=2 color=#000080 face="Arial">I wondered if any one else has 
accomplished this and would have any hints or tricks.</font>
<br>
<br>
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