Hello Donna
Yes, running daily cumulative with a weekend full would produce overlap ratios
of 1-2-3-4-full through the work week. I was just wondering if something more
elegant could be arranged. I suppose that alternating differentials and
cumulative might produce overlap ratios of 1-1-2-1-full or 1-2-1-3-full which
closely emulates the Towers of Hanoi approximation to the desired overlap
ratios, however I was hoping for something that required less frequent sequence
resets ie.: a greater interval between the required full backups as the full
backups are always the worst case scenarios for scheduling. Ideally, it would
be best to have the differentials and the cumulatives to separate volume pools
in order to ensure redundancy across separate media rather than hoping that mpx
multiplexes enough clients to fill up the media before the next day's run.
Regards,
John I Wang
Sr. Systems Engineer
Steverson Information Professionals
---
Enron Broadband Services
3 Allen Center, Room 337C
PH (713) 345-6238
|--------+-------------------------->
| | donna.nadimi@luc|
| | asfilm.com |
| | |
| | 10/25/00 03:50 |
| | PM |
| | |
|--------+-------------------------->
>----------------------------------------------------------------------------|
| |
| To: John Wang/Contractor/Enron Communications@Enron |
| Communications |
| cc: |
| Subject: RE: [Veritas-bu] Re: Towers of Hanoi |
>----------------------------------------------------------------------------|
Maybe this isn't what you're looking for either, but how about just
selecting "cumulative" incremental backups. That will backup everything
changed since the last full. Save yourself some headaches.
--donna
Unix *is* user friendly. It's just picky about who its friends are.
Donna Nadimi
UNIX Systems Engineer
Lucasfilm Ltd.
(415)662-1956
donna.nadimi AT lucasfilm DOT com
-----Original Message-----
From: John_Wang AT enron DOT net [mailto:John_Wang AT enron DOT net]
Sent: Wednesday, October 25, 2000 1:40 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Re: Towers of Hanoi
Hello
There seems to be some confusion. I was asking how to emulate such
behaviour
with Netbackup, not for the actual sequence or for a description of the
algorithm. The goal being to achieve some redundancy by having overlapping
incrementals so that tape mirroring or duplication would not be needed to
ensure
reasonable protection against failed media.
Besides most variations of the sequence achieve alternating overlap ratios
(ie.:
1-2-1-2 or 1-2-1-3) whereas if one was to just use a 9 level backup utility
like
that in Unix, one could easily fake the dumpdates file to achieve a constant
overlap ratio of 2-2-2... But that's not the point, I don't want to hand
roll a
backup scheme using Unix commands, I want to manipulate Netbackup to achieve
the
same goals.
Regards,
John I Wang
Sr. Systems Engineer
Steverson Information Professionals
---
Enron Broadband Services
3 Allen Center, Room 337C
PH (713) 345-6238
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
|
