[Veritas-bu] how does NBU find out if hte image has been expi red or not?

[Donaldson, Mark]

I think that date (Jan 18, 2038) is the limit of the unix signed-integer
32-bit clock.  It's been a while since I've done the math but that's the
right range.
 
All time in Unix is kept as a 32-bit signed integer as the number of seconds
since Jan 1, 1970.  Technically, therefore, there's a time in the future
when the unix clock will rollover and be useless.  Also, most probably,
we'll all be on 64-bit or better OS's by then and this'll never be an issue.
 
Still, I think netbackup is calculating the date as 0x7FFFFFFF offset from
the base time and that's as close to infinity as will be allowed by their
expiration method.
 
As to the other, I think the tape expiration date is set to the date of the
last-to-expire image on that tape.  Read the "recalculate" option on the
bpexpdate man page for more.
 
-Mark
 
 
 -----Original Message-----
From: Dongfang Liao [mailto:dongfang.liao at rogers.com]
Sent: Wednesday, March 27, 2002 8:03 PM
To: veritas-bu
Subject: [Veritas-bu] how does NBU find out if hte image has been expired or
not?



Hi All,
 
Have you seen this kind of problem before? can anyone tell me how NBU finds
out if hte image has been expired or not?
 
We just found out some one years old image files, which the expiration dates
have been changed manually to 2 years old after they were backed up, were
lost without any reason. We suspect NBU bpdbm mis-thinks the images have
been expired and cleans up these image files since we found out the
retention level of the image files were not changed after we compared some
image files that we manually change the expiration date. The only changes is
the expiration date of the images. 
 
Will it be possible that bpdbm clean up the images files just by the
retention level without checking the expiration date? or will NBU bpdbm
check the both retention level and expiration date?
 
By the way, The retention level 9, which is supposed to be infinity, By in
my environment, the expiration date for "infinity" is set to "Mon Jan 18
22:14:07 2038". Make sense? But if you change your image to retention level
9, and check the expiration date on the image file, you will get this date.
 
Appreciate for any help!
-----------------------
Thanks
ldf

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