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[Veritas-bu] 1 week retention periods
2004-01-07 11:48:41
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The tape is appended to until it's full. When the last image on the tape
expires due to retention, then the tape is reusable. They'll need at least
two tapes, therefore, for the differential images. They'll write to the
second tape while waiting for the images on the first tape to finish
expiring. Netbackup will not use the space at the beginning of a tape
("free" space from expired images) if there's valid info later on the tape.
In other words, a assign tape will only have new data appended.
HTH - M
-----Original Message-----
From: Nick Lefebvre [mailto:nick.lefebvre AT solnet.com DOT au]
Sent: Tuesday, January 06, 2004 5:45 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] 1 week retention periods
Hi,
I've just recently set up Netbackup 4.5 in a site. The client due to a lack
of available tapes has decided to run their policy with a 1 week retention
period.
There is one policy with a full backup on the Friday, and a differential-inc
on every other day.
The full backups are on one tape.
The differentials are appended on a daily basis onto one tape.
My question relates to the differential backups. If you have a weeks worth
of differential backups that are appended to the one tape with a 1 week
retention period this tape should be available for use after one week. Once
that tape becomes available and is overwritten with a differential backup
for the new week what would happen to the differential backups that are
appended at the end of the week??
Would there be any way of recovering these jobs at the end of the week once
the tape becomes available for new backups if a new differential backup is
written to the tape??
Cheers,
Nick
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<DIV><SPAN class=540504616-07012004><FONT face=Arial color=#0000ff size=2>The
tape is appended to until it's full. When the last image on the tape
expires due to retention, then the tape is reusable. They'll need at
least
two tapes, therefore, for the differential images. They'll write to the
second tape while waiting for the images on the first tape to finish
expiring. Netbackup will not use the space at the beginning of a tape
("free" space from expired images) if there's valid info later on the
tape. In other words, a assign tape will only have new data
appended.</FONT></SPAN></DIV>
<DIV><SPAN class=540504616-07012004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=540504616-07012004><FONT face=Arial color=#0000ff size=2>HTH -
M</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Nick Lefebvre
[mailto:nick.lefebvre AT solnet.com DOT au]<BR><B>Sent:</B> Tuesday, January
06, 2004
5:45 PM<BR><B>To:</B> veritas-bu AT mailman.eng.auburn DOT
edu<BR><B>Subject:</B>
[Veritas-bu] 1 week retention periods<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I’ve just recently set up
Netbackup 4.5 in a site. The client due to a lack of available tapes has
decided to run their policy with a 1 week retention period.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">There is one policy with a full
backup on the Friday, and a differential-inc on every other
day.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The full backups are on one
tape.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The differentials are appended on
a daily basis onto one tape.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">My question relates to the
differential backups. If you have a weeks worth of differential backups that
are appended to the one tape with a 1 week retention period this tape should
be available for use after one week. Once that tape becomes available and is
overwritten with a differential backup for the new week what would happen to
the differential backups that are appended at the end of the
week??</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Would there be any way of
recovering these jobs at the end of the week once the tape becomes available
for new backups if a new differential backup is written to the
tape??</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Cheers,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Nick</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY:
Arial"></SPAN></FONT> </P></DIV></BLOCKQUOTE></BODY></HTML>
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