If I had to guess, I'd say go with SWA to tape. SWA or a regular save to
SAVF will likely hammer your disks & controller and may wind up being slower
than a save directly to tape. Then there's the added overhead of after
saving to SAVF, saving those SAVFs to tape. And while not a big problem,
that also complicates recovery in that there are extra steps to get the
SAVFs back on the system before BRMS can restore objects from them.

Since the performance is questionable, you could run some tests to compare
saving to SAVF then SAVF to tape v. straight to tape. This is one of those
places where YMMV.

Also, if your DASD usage grows over time, you may find yourselves running
out of room under the SAVF method.

FYI here we do a BRMS 21 equivalent once a month. Nightly we do 2 BRMS
SWAs: One for all production data libraries in their entirety and a second
that's just a save changed objects against everything else (with update
history=No). A full restore thus only needs the most recent monthly & the
most recent daily.

On Tue, Sep 1, 2009 at 9:48 AM, <lgoodbar@xxxxxxxxxxxxxx> wrote:

We are looking to reduce our daily backup time. System is a 9406-810,
7409 capacity processor, 3GB main storage, 350GB. Backing up to a
3581-H13 (LTO-1 cartridges) connected to a 2749 controller. Our 350GB
DASD is spread over 6 4327 70GB drives, all at 56% space used. OS
version is V5R4 using BRMS. A full system save fits on one tape.

Our daily backups (Tuesday-Saturday morning) only save critical
information, including security data, config, ERP / financial data,
in-house files, QGPL, DLO and IFS. The save takes just over 2 hours,
3:00am-5:09am on 9/1. On Sunday we take a full system backup (BRMS
equivalent of Save 21), which lasts for 3.5 hours (2:00am-5:32am 8/30).
ERP and financial data is the bulk of our system.

Money is tight so getting another tape drive is out. I would like to use
BRMS to either or both of using save while active and saving to a save
file. I forget if virtual tape is available in V5R4.

I'm in the process of reviewing the save/restore and BRMS manuals, but
looking for some real-world data from anyone who has done either or both
of these strategies.

What is the "right" way to implement SWA?

Any info, tips, and tricks appreciated.



Loyd Goodbar

Business Systems

BorgWarner Shared Services


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