Veritas-bu

[Veritas-bu] Veritas NDMP incremental backup weirdness

2004-01-22 16:32:45
Subject: [Veritas-bu] Veritas NDMP incremental backup weirdness
From: neil AT mbari DOT org (Conner, Neil)
Date: Thu, 22 Jan 2004 13:32:45 -0800
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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&nbsp;antivirus scanner on the filer 
from an NT box.&nbsp; You can see what's happening by examining 
/etc/dumpdates&nbsp;on the filer.&nbsp; The fix is to&nbsp;use the ignore_ctime 
option of ndmpd.&nbsp; 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>&nbsp;</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>&nbsp;</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). &nbsp;I assume this has been 
  going on for a long time. &nbsp;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. &nbsp;This 
  results in all changes since the last level 0 (Full) backup to be written, 
  which I interpret to be Cumulative. &nbsp;Once in a while (on a random day of 
  the week), a real Incremental backup (level 2) will be performed. &nbsp;This 
  is verified by examining the /etc/backup logs on the filer, which show the 
  level of dump being used. &nbsp;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. &nbsp;This looks like a 
  Veritas bug, and I have found no r! eference to it on the web. &nbsp;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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