[EMAIL PROTECTED] am 05.07.2001 18:14:35
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An: [EMAIL PROTECTED]
Kopie: (Blindkopie: Gerhard Wolkerstorfer/DEBIS/EDVG/AT)
Thema:Re: Database backup performance
*1*
I have increased it to 9 to see what happens.
This could help in a *BIG* way
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Petr Prerost
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ADSM: Dist
Petr Prerost
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ADSM: Dist
Stor Manager
Hi Zoltan ,
what is your tapeiobufs setting ? Can you see better tape throughput with
migration processing ?
regards
Petr
- Puvodnm zprava -
Od: Zoltan Forray/AC/VCU [EMAIL PROTECTED]
Komu: [EMAIL PROTECTED]
Odeslano: 2. cervence 2001 15:47
Predmet: Database backup
I want to thank everyone who responded to my question(s). It seems that
*EVERYONE* goes faster than us, some by a big margin.
I just finished upgrading the OS/390 server from ADSM 3.1.2.50 to TSM
4.1.3. I was hoping the DB backup would be faster. Unfortunately, there is
no joy in Mudville.
Our db backup stats are below. We do 2 db backups
per day, one to disk and one to tape.
all pages: 11,266,048 (44g)
used pages: 8,387,060 (34g)
disk bkup: 60min - local ESS disk
tape bkup: 60min - 3590 drives
processor: 6k-s7a
Any suggestions on how to improve DB backup performance ?
Doing a FULL DB backup of our 15GB ADSM (yes, not TSM YET. Hoping to
convert to 4.1.3 RSN !!) server, sometimes takes 4-hours.
Since I read a previous message about someone having a 52GB DB, I was
wondering how long it takes to backup
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To: [EMAIL PROTECTED]
cc:(bcc: John Naylor/HAV/SSEG)
Subject: Re: Database backup performance
I guess I should have clarified that the server is on OS/390, not *NIX !!
Thanks for all the responses on how long it takes. Now, how about ways to
improve the speed ?
I am trying a backup
Zoltan,
Sorry I forgot to mention, as you are OS390 it will be worth looking at the RMF
statistics
for the period of the database backup. This should show which resource is
causing your backup to run so slow. It could be cpu or possibly disk
contention,
John
Zoltan,
I have a very large os/390 server. The last full dbb went at a rate of
3.3 million pages/hr, almost 5 times fater than yours.
Since v1 r1 of adsm I haven't found any tricks to speed this up
except to change hardware. My current system is
cpu: 9672-ra6
tape: 9840 running 3590
We back up 19,591,179 pages in 4 hours. This is an 83GB database, 91%
utilized. Server is an RS/6000 M80. Backup media is DLT 7000
tape. Translates to 5.3MB/s by my calculation. Our incremental backups
usually take 15-30 minutes.
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