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Jeff,
About a month ago I was working with a customer to reduce the backup
window on their 825. We split the backup to dual 3580's and took the
save from 7 hours to 3.5 hours. CPU, Memory and DASD were waaaay under
utilized. I rewrote the thing to be in three pieces:
a) Run though a list of libraries sending a data queue entry for each.
b) Submit some number (I started with four) concurrent jobs to do
saves to *SAVFs by reading the list from the queue.
c) when they are all done
1) relight the system
2) Submit another job to copy to tape.
Net result was to carve the save time down to under 2 hours, not
counting save to tape which is no longer on the critical path. I still
need to do some monitoring of resources to see if more concurrent jobs
would help even more. We did compression to the *SAVFs as disk is never
an unlimited resource!
We had already given up on their 3590 as the 3580's make that thing
look like punched paper tape.
- Larry
Jeff Crosby wrote:
This talk about backing up \QNTC\ directories leads me to ask a question
I've been thinking about.
To reduce the backup window on the iSeries, is there anyone out there who is
backing up to disk (*SAVF) and, when the system is brought back from a
restricted state, then transferring the *SAVF files to tape?
I was curious as to whether something like this reduces the backup window as
far as restricted state is concerned. And I know what tape drive is used
makes a big difference. Plus backing up to a *SAVF is a '1 library at a
time' thing.
--
Larry Bolhuis IBM eServer Certified Systems Expert:
Vice President iSeries Technical Solutions V5R2
Arbor Solutions, Inc. iSeries LPAR Technical Solutions V5R2
1345 Monroe NW Suite 259 iSeries Linux Technical Solutions V5R2
Grand Rapids, MI 49505 iSeries Windows Integration Technical
Solutions V5R2
IBM eServer Certified Systems Specialist
(616) 451-2500 iSeries System Administrator for
OS/400 V5R2
(616) 451-2571 - Fax AS/400 RPG IV Developer
(616) 260-4746 - Cell iSeries System Command Operations V5R2
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