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Are you doing this for capacity planning purposes?
Try this:
DATA_FULLS=DATA * (FULL_RETENTION / FULL_FREQUENCY)
Then take DATA_FULLS and divide that by the NATIVE capacity of your tapes to
give you the number of tapes required. If you get a high level of
compression, GREAT, but you should always plan based on the NATIVE
capacities.
If you want to calculate the Incrementals,
DATA_INCR=DATA * %OF_CHANGE * (INCR_RETENTION / INCR_FREQUENCY) -
(INCR-RETENTION / FULL-FREQUENCY) * (DATA * %OF_CHANGE)
This gives you the amount of data for the Incrementals minus the days that
the fulls run.
David
<><><><><><><><><><><><><><><><><><><><>
David A. Chapa
Backup Storage Consultant
DataStaff, Inc.
http://www.datastaff.com
312 683 1144
---------------------------------------
-----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 jerome
bauwens
Sent: Tuesday, August 20, 2002 8:46 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] How to estimate how many tapes I need ?
Hello everyone,
I'm using NetBackup 3,4GA with a Solaris Master and media Server and a
L700 Library. I'd like to be able to list how many tapes are available and
how much data I'll be able to backup. I'm using 9840 drives with 20 Gb
cartriges that appear to be able to store between 20 Gb and 150 Gb (?) as
listed by bpimmedia. We're multiplexing up to 4 clients to a tape and I
don't really know how to list how much data from each client is on a tape.
Does Advanced Reporter help me do that and do I need a license to use it? Is
there a way to get a graph in order to estimate how many more tapes I'll
need depending on how many more data to backup I'll have.
Thanks
Jerome Bauwens
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<BODY bgColor=3D#ffffff>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2>Are=20
you doing this for capacity planning purposes?</FONT></SPAN></DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2>Try=20
this:</FONT></SPAN></DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2>DATA_FULLS=3DDATA * (FULL_RETENTION / =
FULL_FREQUENCY)</FONT></SPAN></DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2>Then=20
take DATA_FULLS and divide that by the NATIVE capacity of your tapes to =
give you=20
the number of tapes required. If you get a high level of =
compression,=20
GREAT, but you should always plan based on the NATIVE=20
capacities.</FONT></SPAN></DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2>If you=20
want to calculate the Incrementals, </FONT></SPAN></DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2>DATA_INCR=3DDATA *=20
%OF_CHANGE * (INCR_RETENTION / INCR_FREQUENCY) - (INCR-RETENTION /=20
FULL-FREQUENCY) * (DATA * %OF_CHANGE)</FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D665541516-21082002></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D665541516-21082002>This gives you the amount of data for the =
Incrementals=20
minus the days that the fulls run.</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D665541516-21082002></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=3D665541516-21082002><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D665541516-21082002>David</SPAN></FONT></SPAN></DIV>
<P><FONT=20
size=3D2><><><><><><><><>=
<><><><><><><><><>&=
lt;><><><BR>David=20
A. Chapa<BR>Backup Storage Consultant<BR>DataStaff, Inc.<BR><A=20
href=3D"http://www.datastaff.com/"=20
target=3D_blank>http://www.datastaff.com</A><BR>312 683=20
1144<BR>---------------------------------------</FONT> </P>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B>=20
veritas-bu-admin AT mailman.eng.auburn DOT edu=20
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]<B>On Behalf Of =
</B>jerome=20
bauwens<BR><B>Sent:</B> Tuesday, August 20, 2002 8:46 AM<BR><B>To:</B> =
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> [Veritas-bu] How =
to=20
estimate how many tapes I need ?<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Hello everyone,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>I'm using NetBackup 3,4GA with a =
Solaris Master=20
and media Server and a L700 Library. I'd like to be able to list how =
many=20
tapes are available and how much data I'll be able to backup. I'm =
using 9840=20
drives with 20 Gb cartriges that appear to be able to store between 20 =
Gb and=20
150 Gb (?) as listed by bpimmedia. We're multiplexing up to 4 clients =
to a=20
tape and I don't really know how to list how much data from each =
client is on=20
a tape. Does Advanced Reporter help me do that and do I need a license =
to use=20
it? Is there a way to get a graph in order to estimate how many more =
tapes=20
I'll need depending on how many more data to backup I'll =
have.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Thanks</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Jerome=20
Bauwens</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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