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We had the same problem when we started running an antivirus scanner on the
filer from an NT box. You can see what's happening by examining /etc/dumpdates
on the filer. The fix is to use the ignore_ctime option of ndmpd. The command
is a toggle but it has to be inserted into the rc file because the filer
reverts back to ignore_ctime = false after a reboot.
# ndmpd ignore_ctime
Neil
-----Original Message-----
From: Moshe Linzer [mailto:Moshe.Linzer AT nsc DOT com]
Sent: Thursday, January 22, 2004 6:20 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Veritas NDMP incremental backup weirdness
I just noticed a really weird thing about our incremental backups being run
from Veritas Netbackup DC 4.5 to our Netapp 960 (6.4.2P6). I assume this has
been going on for a long time. No matter if we select Incremental Differential
Backup on weekdays or Cumulative Differential Backup on weekends, both seem to
run a level 1 backup on the filer. This results in all changes since the last
level 0 (Full) backup to be written, which I interpret to be Cumulative. Once
in a while (on a random day of the week), a real Incremental backup (level 2)
will be performed. This is verified by examining the /etc/backup logs on the
filer, which show the level of dump being used. Examining the amount of data
being backed up also shows a steady increase in the Incremental backups,
indicating that they are all backing up the same data from the last Full. This
looks like a Veritas bug, and I have found no r! eference to it on the web. If
anyone has encountered this, please advise!
Thanks,
Moshe
Moshe Linzer
IT Manager
National Semiconductor, Israel
Phone: 972-9-970-2247
Fax: 972-9-970-2001
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<DIV><SPAN class=929332621-22012004><FONT face=Arial color=#0000ff size=2>We
had
the same problem when we started running an antivirus scanner on the filer
from an NT box. You can see what's happening by examining
/etc/dumpdates on the filer. The fix is to use the ignore_ctime
option of ndmpd. The command is a toggle but it has to be inserted into
the rc file because the filer reverts back to ignore_ctime = false after a
reboot.</FONT></SPAN></DIV>
<DIV><SPAN class=929332621-22012004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=929332621-22012004><FONT face=Arial color=#0000ff size=2>#
ndmpd ignore_ctime</FONT></SPAN></DIV>
<DIV><SPAN class=929332621-22012004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=929332621-22012004><FONT face=Arial color=#0000ff
size=2>Neil</FONT></SPAN></DIV>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Moshe Linzer
[mailto:Moshe.Linzer AT nsc DOT com]<BR><B>Sent:</B> Thursday, January 22,
2004 6:20
AM<BR><B>To:</B> veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B>
[Veritas-bu] Veritas NDMP incremental backup
weirdness<BR><BR></FONT></DIV><BR><FONT face=sans-serif size=2>I just noticed
a really weird thing about our incremental backups being run from Veritas
Netbackup DC 4.5 to our Netapp 960 (6.4.2P6). I assume this has been
going on for a long time. No matter if we select <I>Incremental
Differential Backup</I> on weekdays or <I>Cumulative Differential Backup</I>
on weekends, both seem to run a level 1 backup on the filer. This
results in all changes since the last level 0 (Full) backup to be written,
which I interpret to be Cumulative. Once in a while (on a random day of
the week), a real Incremental backup (level 2) will be performed. This
is verified by examining the /etc/backup logs on the filer, which show the
level of dump being used. Examining the amount of data being backed up
also shows a steady increase in the Incremental backups, indicating that they
are all backing up the same data from the last Full. This looks like a
Veritas bug, and I have found no r! eference to it on the web. If
anyone
has encountered this, please advise!</FONT> <BR><BR><FONT face=sans-serif
size=2>Thanks,</FONT> <BR><BR><FONT face=sans-serif size=2>Moshe</FONT>
<BR><FONT face=sans-serif size=2><BR></FONT>
<TABLE>
<TBODY>
<TR>
<TD><FONT face="Times New Roman" color=blue size=4><B>Moshe
Linzer</B></FONT> <BR><FONT face="Times New Roman" color=#000099
size=3><B>IT Manager</B> </FONT>
<TR>
<TD><FONT face="Times New Roman" color=#000099 size=2><B><I>National
Semiconductor, Israel<BR>Phone: 972-9-970-2247<BR>Fax:
972-9-970-2001</I></B></FONT></TR></TBODY></TABLE><BR></BLOCKQUOTE></BODY></HTML>
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