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[Veritas-bu] Tape calculator
2006-03-02 10:41:16
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Subject: |
[Veritas-bu] Tape calculator |
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From: |
JMARTI05 AT intersil DOT com (Martin, Jonathan (Contractor)) |
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Date: |
Thu, 2 Mar 2006 10:41:16 -0500 |
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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
________________________________
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
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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<BODY>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Assuming the amount of data to be backed up =
isn't going to=20
increase you can always "guess" by using your offsite =
logs.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>ie. </FONT></SPAN><SPAN=20
class=3D370543615-02032006><FONT face=3DArial color=3D#0000ff =
size=3D2>If you send 10=20
tapes offsite per week and an additional 20 tapes at end of=20
month</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>10 (tapes per year) x 52 (weeks in a year) =3D =
520=20
tapes</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>20 (tapes monthlies) x 12 (months /yr) =3D 240=20
tapes</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>etc... I have to keep a record of all tapes =
sent offsite so=20
it was fairly easy for me to do something similar to this using logged=20
information from months prior. If you don't have this kind of =
information=20
available, then you are basically on the mission outlined=20
below.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D370543615-02032006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>-Jonathan</FONT></SPAN></DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> =
veritas-bu-admin AT mailman.eng.auburn DOT edu=20
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B>On Behalf Of=20
</B>manuel.j.desousa AT jpmchase DOT com<BR><B>Sent:</B> Thursday, March 02, =
2006 9:52=20
AM<BR><B>To:</B> veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> =
Re:=20
[Veritas-bu] Tape calculator<BR></FONT><BR></DIV>
<DIV></DIV><BR><FONT face=3Dsans-serif size=3D2>Deiter,</FONT> =
<BR><BR><FONT=20
face=3Dsans-serif size=3D2>You need to have:</FONT> <BR><BR><FONT =
face=3Dsans-serif=20
size=3D2>How much data per client</FONT> <BR><FONT face=3Dsans-serif =
size=3D2>What is=20
your retention policy, </FONT><BR><FONT face=3Dsans-serif size=3D2>What =
schedules -=20
cum-incremental/ incremental (% of total data changed =3D I used 20% as =
a rule of=20
thumb) and full </FONT><BR><FONT face=3Dsans-serif =
size=3D2>Frequency of each=20
schedule...</FONT> <BR><FONT face=3Dsans-serif size=3D2>Number of copies =
for each=20
backup.</FONT> <BR><BR><FONT face=3Dsans-serif size=3D2>I treated each =
client as=20
individual - so each client was allocated media according to it's =
size - I=20
used to allocate min 1 tape per day per client if they wanted off-site =
too. You=20
could become too technical and "group" all the incrementals together =
onto 1=20
tape, but then you do get broken media...and if u allocate exactly you =
won;t=20
have any spares.</FONT> <BR><BR><FONT face=3Dsans-serif size=3D2>Also - =
at around=20
$50 per tape - not too expensive....considering the risk of no recovery =
at=20
all...</FONT> <BR><BR><FONT face=3Dsans-serif size=3D2>I used to have =
this in a=20
Excel spreadsheet.</FONT> <BR><BR><BR><FONT face=3Dsans-serif =
size=3D2>Good=20
luck,</FONT> <BR><BR><FONT face=3Dsans-serif size=3D2>\_JdS_/</FONT>=20
<BR><BR><BR><BR><BR><BR>
<TABLE width=3D"100%">
<TBODY>
<TR vAlign=3Dtop>
<TD>
<TD><FONT face=3Dsans-serif size=3D1><B>Deiter Scott=20
<scottd AT HanoverDirect DOT com></B></FONT> <BR><FONT =
face=3Dsans-serif=20
size=3D1>Sent by: veritas-bu-admin AT mailman.eng.auburn DOT edu</FONT>=20
<P><FONT face=3Dsans-serif size=3D1>02/03/2006 13:56</FONT> =
<BR></P>
<TD><FONT face=3DArial size=3D1> =
</FONT><BR><FONT=20
face=3Dsans-serif size=3D1> To: =
=20
veritas-bu AT mailman.eng.auburn DOT edu</FONT> <BR><FONT=20
face=3Dsans-serif size=3D1> cc: =
=20
</FONT> <BR><FONT face=3Dsans-serif size=3D1> =
=20
Subject: [Veritas-bu] Tape=20
calculator</FONT></TR></TBODY></TABLE><BR><BR><BR><FONT =
face=3D"Times New Roman"=20
color=3D#000080 size=3D3>Solaris 9 master/media server at 5.1 mp4</FONT> =
<BR><FONT=20
face=3D"Times New Roman" color=3D#000080 size=3D3>6 solaris =
clients</FONT> <BR><FONT=20
face=3D"Times New Roman" color=3D#000080 size=3D3>20 some windows =
clients=20
</FONT> <BR><FONT face=3D"Times New Roman" color=3D#000080 =
size=3D3>storagetek=20
robot using SDLT's</FONT> <BR><FONT face=3D"Times New Roman" =
color=3D#000080=20
size=3D3> </FONT> <BR><FONT face=3D"Times New Roman" =
color=3D#000080 size=3D3>We=20
have been asked to determine the amount of tapes needed to complete all =
our=20
current backup schedules till the end of this year.</FONT> <BR><FONT =
face=3DArial=20
color=3D#000080 size=3D2>I wondered if any one else has accomplished =
this and would=20
have any hints or tricks.</FONT> <BR><BR></BODY></HTML>
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