Veritas-bu

[Veritas-bu] logic behind allocation of fragments to tape

2003-01-28 11:51:41
Subject: [Veritas-bu] logic behind allocation of fragments to tape
From: sjaffee AT soe.sony DOT com (Jaffee, Sid)
Date: Tue, 28 Jan 2003 08:51:41 -0800
Below is a snip from my "Images on Media" report. What puzzles me is why
NetBackup needed/used 6 DLT tapes  (which handle 80GB each) when 4 tapes
would of covered it??? I only had extra tapes loaded as a precaution  (in
case a sys-admin temporarily loads a ton of logs somewhere he shouldn't).
Yet, you can see NetBackup used all 6 tapes.

Backup-ID            Class      Type  RL  Files   C  E  T  PC  Expires
Copy Frag    KB Type Density FNum      Off       Host       DWO MPX Expires
MediaID
----------------------------------------------------------------------------
--------------------

bosco_1043522261  bosco-ca FULL  3   164502  N  N  R  1   11:17 02/25/2003
 1 IDX    30749 RMed dlt     2         0         sdlog1.sta 6
AW2005
 1   1 77909517 RMed dlt     1         0         sdlog1.sta 6   N   11:17
02/25/2003 AW2006
 1   2 48829347 RMed dlt     1         0         sdlog1.sta 6
AW2007
 1   3 34517763 RMed dlt     1         0         sdlog1.sta 6
AW2008
 1   4 34875099 RMed dlt     1         0         sdlog1.sta 6
AW2003
 1   5 35069328 RMed dlt     1         0         sdlog1.sta 6
AW2004
 1   6 10408041 RMed dlt     1         0         sdlog1.sta 6
AW2005
     -----------
    = 241639844 KB
    = 241.6 GB   <-- 4 x 80GB DLT tapes should cover this amount

Is there a reason that the last fragment (#6 = 10408041 KB) was seperated to
it's own tape? Or why fragment #4  and #5 weren't put on the same tape (as
they add up to less than 80GB)? If I had only put in 4 tapes, would
NetBackup been able to complete this backup?

Yes, these tapes were expired accordingly previous to this backup. I only
seek to be more economical with my tapes usage.


suggestions/comments welcome,

Sid Jaffee
Systems Engineer

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