Re: Backup performance

[rob@xxxxxxxxx]

I think 3590's have several different models, and it really matters if you 
have enough horsepower to drive them.

One 3590 dropped from 44 minutes to do a SAVSYS to 4, just by upgrading 
from a model 7xx.

The 3590's are faster.  However the 3580's definitely put more data on a 
single tape.  We have a machine that uses one 3590 and two 3580's.  The 
TSM pc backup data eats up twelve 3580 tapes.  The Domino data eats up 
four 3590 tapes.  The "real" or, as I call it, "DB2" data, fits on one 
3590 tape.

Rob Berendt
-- 
"All creatures will make merry... under pain of death."
-Ming the Merciless (Flash Gordon)




Larry Bolhuis <lbolhuis@xxxxxxxxxx> 
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01/16/2004 09:32 PM
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Re: Backup performance






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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