Re: APYJRNCHG

["R. Bruce Hoffman, Jr." <rbruceh@xxxxxxxxxxxxx>]

-----Original Message-----
From: oliver.wenzel@cibavision.novartis.com
<oliver.wenzel@cibavision.novartis.com>
To: midrange-l@midrange.com <midrange-l@midrange.com>
Date: Thursday, August 23, 2001 4:08 AM
Subject: AW: APYJRNCHG


---snip---
re savchgobj: I'll have a full backup on sunday and daily savchg. If I loose
the system on saturday I'll need 6 different
tapes to do the reload, right? What happens if one of the daily tapes is
damaged? As Murphy says, it sure will be the
monday tape...

---snip---

This is a common misconception. The answer is "it depends". Once an object
goes changed it remains changed, so long as the save change object uses the
same reference date.

In that case, where you are not creating and deleting files and members, no,
you only need the full and the latest save changed object tapes.

Under a product like BRMS, or your own program, you can specify that you
want incremental changes which then substitutes the last changes save date
and time on the reference of the save changed object command.

In this case, yes, you need them all for restore.

The trade off is much shorter windows for each save against a more
complicated restore. The questions are: which one will you be doing most
often (save or restore) and how much of a save window do you have, how much
lead time on recovery do you have and how long do you have to recover?

===========================================================
R. Bruce Hoffman, Jr.
 -- IBM Certified Specialist - AS/400 Administrator
 -- IBM Certified Specialist - RPG IV Developer

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