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[Veritas-bu] Tape calculator

2006-03-02 10:48:55
Subject: [Veritas-bu] Tape calculator
From: Brian.Greenberg AT citadelgroup DOT com (Greenberg, Brian)
Date: Thu, 2 Mar 2006 09:48:55 -0600 
This is a multi-part message in MIME format.

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I'm working on this very problem.  But remember, you need to also take
into account the retention policy for each piece of media you send off
site.  If you send 5 tapes off site with a retention policy of two weeks
and 5 tapes with a retention policy of 2 months, in two weeks you'll get
5 tapes back but in two months you'll get 10 tapes back.  It's really
tricky to model.  I've been working on a tool to help figure this out
but haven't had time to complete it yet.  Anyone out there have this
kind of tool?


Regards,

                   Brian

________________________________

From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Martin,
Jonathan (Contractor)
Sent: Thursday, March 02, 2006 9:41 AM
To: manuel.j.desousa AT jpmchase DOT com; veritas-bu AT mailman.eng.auburn DOT 
edu
Subject: RE: [Veritas-bu] Tape calculator

=20

Assuming the amount of data to be backed up isn't going to increase you
can always "guess" by using your offsite logs.

=20

ie.  If you send 10 tapes offsite per week and an additional 20 tapes at
end of month

=20

10 (tapes per year) x 52 (weeks in a year) =3D 520 tapes

20 (tapes monthlies) x 12 (months /yr) =3D 240 tapes

=20

etc... I have to keep a record of all tapes sent offsite so it was
fairly easy for me to do something similar to this using logged
information from months prior.  If you don't have this kind of
information available, then you are basically on the mission outlined
below.

=20

-Jonathan

=20

________________________________

From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of
manuel.j.desousa AT jpmchase DOT com
Sent: Thursday, March 02, 2006 9:52 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Tape calculator


Deiter,=20

You need to have:=20

How much data per client=20
What is your retention policy,=20
What schedules - cum-incremental/ incremental (% of total data changed =
=3D
I used 20% as a rule of thumb) and  full=20
Frequency of each schedule...=20
Number of copies for each backup.=20

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.=20

Also - at around $50 per tape - not too expensive....considering the
risk of no recovery at all...=20

I used to have this in a Excel spreadsheet.=20


Good luck,=20

\_JdS_/=20






=20

Deiter Scott <scottd AT HanoverDirect DOT com>=20
Sent by: veritas-bu-admin AT mailman.eng.auburn DOT edu=20

02/03/2006 13:56=20

       =20
        To:        veritas-bu AT mailman.eng.auburn DOT edu=20
        cc:        =20
        Subject:        [Veritas-bu] Tape calculator




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


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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I&#8217;m working on this very =
problem.&nbsp; But
remember, you need to also take into account the retention policy for =
each
piece of media you send off site.&nbsp; If you send 5 tapes off site =
with a
retention policy of two weeks and 5 tapes with a retention policy of 2 =
months,
in two weeks you&#8217;ll get 5 tapes back but in two months =
you&#8217;ll get
10 tapes back.&nbsp; It&#8217;s really tricky to model.&nbsp; I&#8217;ve =
been working on
a tool to help figure this out but haven&#8217;t had time to complete it =
yet.&nbsp;
Anyone out there have this kind of tool?<o:p></o:p></span></font></p>

<div>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DVerdana><span =
style=3D'font-size:
10.0pt;font-family:Verdana;color:navy'><br>
Regards,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DVerdana><span =
style=3D'font-size:
10.0pt;font-family:Verdana;color:navy'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; Brian</span></font><font
size=3D2 face=3DVerdana><span =
style=3D'font-size:10.0pt;font-family:Verdana'><o:p></o:p></span></font><=
/p>

</div>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>

</span></font></div>

<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> =
veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <b><span =
style=3D'font-weight:
bold'>On Behalf Of </span></b>Martin, Jonathan (Contractor)<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, March 02, =
2006
9:41 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
manuel.j.desousa AT jpmchase DOT com;
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [Veritas-bu] =
Tape
calculator</span></font><o:p></o:p></p>

</div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>Assuming the amount of data to be =
backed
up isn't going to increase you can always &quot;guess&quot; by using =
your
offsite logs.</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>ie.&nbsp; If you send 10 tapes =
offsite per
week and an additional 20 tapes at end of =
month</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>10 (tapes per year) x 52 (weeks in =
a year)
=3D 520 tapes</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>20 (tapes monthlies) x 12 (months =
/yr) =3D
240 tapes</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>etc... I have to keep a record of =
all
tapes sent offsite so it was fairly easy for me to do something similar =
to this
using logged information from months prior.&nbsp; If you don't have this =
kind
of information available, then you are basically on&nbsp;the mission =
outlined
below.</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>-Jonathan</span></font><o:p></o:p></=
p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabIndex=3D-1>

</span></font></div>

<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><b><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</spa=
n></font></b><font
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'>
veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <b><span =
style=3D'font-weight:
bold'>On Behalf Of </span></b>manuel.j.desousa AT jpmchase DOT com<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, March 02, =
2006
9:52 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b>
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: [Veritas-bu] =
Tape
calculator</span></font><o:p></o:p></p>

<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'><br>
</span></font><font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;
font-family:sans-serif'>Deiter,</span></font> <br>
<br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>You
need to have:</span></font> <br>
<br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>How
much data per client</span></font> <br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>What
is your retention policy, </span></font><br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>What
schedules - cum-incremental/ incremental (% of total data changed =3D I =
used 20%
as a rule of thumb) and &nbsp;full </span></font><br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>Frequency
of each schedule...</span></font> <br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>Number
of copies for each backup.</span></font> <br>
<br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family: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.</span></font> <br>
<br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>Also
- at around $50 per tape - not too expensive....considering the risk of =
no
recovery at all...</span></font> <br>
<br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>I
used to have this in a Excel spreadsheet.</span></font> <br>
<br>
<br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>Good
luck,</span></font> <br>
<br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>\_JdS_/</span></font>
<br>
<br>
<br>
<br>
<br>
<o:p></o:p></p>

<table class=3DMsoNormalTable border=3D0 cellpadding=3D0 width=3D"100%"
 style=3D'width:100.0%'>
 <tr>
  <td valign=3Dtop style=3D'padding:.75pt .75pt .75pt .75pt'>
  <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span
  style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>
  </td>
  <td valign=3Dtop style=3D'padding:.75pt .75pt .75pt .75pt'>
  <p class=3DMsoNormal><b><font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:
  7.5pt;font-family:sans-serif;font-weight:bold'>Deiter Scott
  &lt;scottd AT HanoverDirect DOT com&gt;</span></font></b> <br>
  <font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'>Sent
  by: veritas-bu-admin AT mailman.eng.auburn DOT edu</span></font> =
<o:p></o:p></p>
  <p><font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:
  sans-serif'>02/03/2006 13:56</span></font> <o:p></o:p></p>
  </td>
  <td valign=3Dtop style=3D'padding:.75pt .75pt .75pt .75pt'>
  <p class=3DMsoNormal><font size=3D1 face=3DArial><span =
style=3D'font-size:7.5pt;
  font-family:Arial'>&nbsp; &nbsp; &nbsp; &nbsp; </span></font><br>
  <font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'>&nbsp;
  &nbsp; &nbsp; &nbsp; To: &nbsp; &nbsp; &nbsp; =
&nbsp;veritas-bu AT mailman.eng.auburn DOT edu</span></font>
  <br>
  <font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'>&nbsp;
  &nbsp; &nbsp; &nbsp; cc: &nbsp; &nbsp; &nbsp; &nbsp;</span></font> =
<br>
  <font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'>&nbsp;
  &nbsp; &nbsp; &nbsp; Subject: &nbsp; &nbsp; &nbsp; &nbsp;[Veritas-bu] =
Tape
  calculator</span></font><o:p></o:p></p>
  </td>
 </tr>
</table>

<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'><br>
<br>
<br>
<font color=3Dnavy><span style=3D'color:navy'>Solaris 9 master/media =
server at 5.1
mp4</span></font> <br>
<font color=3Dnavy><span style=3D'color:navy'>6 solaris =
clients</span></font> <br>
<font color=3Dnavy><span style=3D'color:navy'>20 some windows clients =
&nbsp;</span></font>
<br>
<font color=3Dnavy><span style=3D'color:navy'>storagetek robot using =
SDLT's</span></font>
<br>
<font color=3Dnavy><span style=3D'color:navy'>&nbsp;</span></font> <br>
<font color=3Dnavy><span style=3D'color:navy'>We have been asked to =
determine the
amount of tapes needed to complete all our current backup schedules till =
the
end of this year.</span></font> <br>
</span></font><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial;color:navy'>I wondered if any one else has =
accomplished this
and would have any hints or tricks.</span></font> <o:p></o:p></p>

</div>

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