RE: Burned by SAVCHGOBJ

["Graap, Ken" <keg@xxxxxxxxxxxxx>]

>Dies BRMS allow saves to SAVF?

Yes ... A BRMS control group can be defined specifying that a *SAVF be used.
Control groups can be defined that will then copy these *SAVF's to tape.
Information for objects saved to *SAVF's is stored in the BRMS database so
individual restores can be performed without having to mount media. 

BRMS is also "smart" enough to understand that a library has been created
since the last FULL save process was run. In this situation it performs a
SAVLIB command instead. BRMS can also perform 2 different types of
incremental backups:

*CUML                                                                   
    Incremental backups are cumulative, that is, when an incremental    
    backup is specified, all changed objects since the last full backup 
    are included in the saved objects.                                  

*INCR

    Incremental backups are not cumulative, that is, when an incremental
    backup is specified, all changed objects since the last incremental 
    backup are included in the saved objects.   

>From a recovery point of view the *CUML option lets you recover using fewer
tape mounts and is the option I have always used.

I've used a FULL plus INCREMENTAL save policy successfully for many years. I
perform a disaster recovery test each year and I'm able to recover to the
point of the last journal receiver BU boundary without issue. It has
actually become quite routine. 

There is a gotcha in recovery using the incremental strategy though. For
example, lets say you do a full save of library " A " on Sunday. Delete
several objects out of library " A " on Monday and then do an incremental BU
on Tuesday... When you recover library " A " using these 2 tapes, the object
deleted on Monday will restored when you restore the full save,  and
restoring the incremental save will not delete the objects that were removed
from the library on Monday.

Kenneth

****************************************
Kenneth E. Graap
IBM Certified Specialist 
AS/400e Professional System Administrator
NW Natural (Gas Services)
keg@xxxxxxxxxxxxx
Phone: 503-226-4211 x5537
FAX:    603-849-0591
****************************************

                          

-----Original Message-----
From: Vern Hamberg [mailto:vhamberg@xxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, March 25, 2003 12:09 PM
To: Midrange Systems Technical Discussion
Subject: Re: Burned by SAVCHGOBJ


Yeah, some reaqlly odd things. We have a procedure that does a SAVCHGxxx 
every night, with the previous run's date and time for reference date. We 
save to SAVFs, then copy to IFS and compress with gzip before writing to 
CD. We do libraries individually. One lacuna I just noticed is, a new 
library is not saved with SAVLIB - objects in it get caught by the 
SAVCHGOBJ, and restoring might be a problem if the library does not exist. 
Not too much of a problem - recovery is a manual process for now.

One problem is that the reference date function is specified differently in 
all the various SAVCHGxxx commands - Yuk!

But we've been able to recover from 2 inadvertent DLTLIB's

Dies BRMS allow saves to SAVF?

Regards

Vern