Veritas-bu

[Veritas-bu] incomplete FULL, status of incremental?

2005-07-14 08:19:44
Subject: [Veritas-bu] incomplete FULL, status of incremental?
From: pkeating AT bank-banque-canada DOT ca (Paul Keating)
Date: Thu, 14 Jul 2005 08:19:44 -0400
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The thought just occurred to me this morning, as I was walking into the
office.....
=20
when you do an incremental backup, the client determines which files to
back up, based on archive bits, and various other things (on windows,
particularly.)
=20
So if you run a FULL backup on a machine and the backup gets half way
through, and then fails.....it has "touched" half the files on the
machine.
=20
if you do an incremental shortly after, the incremental "should" be
based on the previous successfull FULL, but if you had a failed FULL
touch a file, and it had changed since the previous successfull full,
but not since the previous failed full, if the incremental is only
looking at when the file was touched by a full, how would it know that
the previous full, which had touched the file, actually failed, and that
it SHOULD back that file up again.
=20
I think I've rambled a bit, and that may not be very clear......if so,
feel free to disregard as the ramblings of a lunatic.
=20
Paul
=20
=20

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<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial size=3D2>The =
thought just=20
occurred to me this morning, as I was walking into the=20
office.....</FONT></SPAN><SPAN class=3D857271412-14072005><FONT =
face=3DArial=20
size=3D2></FONT></SPAN></DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial size=3D2>when =
you do an=20
incremental backup, the client determines which files to back up, based =
on=20
archive bits, and various other things (on windows,=20
particularly.)</FONT></SPAN></DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial size=3D2>So if =
you run a FULL=20
backup on a machine and the backup gets half way through, and then =
fails.....it=20
has "touched" half the files on the machine.</FONT></SPAN></DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial size=3D2>if you =
do an=20
incremental shortly after, the incremental "should" be based on the =
previous=20
successfull FULL, but if you had a failed FULL touch a file, and it had =
changed=20
since the previous successfull full, but not since the previous failed =
full, if=20
the incremental is only looking at when the file was touched by a full, =
how=20
would it know that the previous full, which had touched the file, =
actually=20
failed, and that it SHOULD back that file up again.</FONT></SPAN></DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial size=3D2>I =
think I've rambled=20
a bit, and that may not be very clear......if so, feel free to disregard =
as the=20
ramblings of a lunatic.</FONT></SPAN></DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial=20
size=3D2>Paul</FONT></SPAN></DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D857271412-14072005><FONT face=3DArial=20
size=3D2></FONT></SPAN>&nbsp;</DIV></BODY></HTML>
=00
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