Re: Very poor restore performance

Stefan,
We have very poor restore performance as well.  I noticed that after a
while, files are spread out over a large amount of tapes- even with
collocation by node turned on- and the seek time for the files is what is
taking FOREVER!.  I reduced the number of versions - which has helped a
little.  Also, creating copy storage pools that help consolidating the
amount of data to decrease the seek time.  Also, we went from a 10 MB to 100
MB Network line- I am still attempting to "tune" our system to take full
advantage of this capacity.  Hope some of these things help you.
                Good Luck,

Andrew P. Schauerte

I.T. Analyst
Information Technology
(505) 828-5383
(505) 828-5500 (fax)
Honeywell
Defense Avionics Systems

> ----------
> From:         Seibt,Stefan HG-Dir ws-sp[SMTP:SeibtS AT ALTE-LEIPZIGER DOT DE]
> Sent:         Tuesday, March 16, 1999 6:33 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Very poor restore performance
>
> Hi there,
>
> We have an ADSM server for each operating system client platform, i.e.
> an ADSM server for NT clients, an ADSM server for netware clients, an
> ADSM server for several unix client. We use a fourth ADSM server only
> for archiving files.
> Our ADSM server environment describes as follows : OS/390 2.4, TCP/IP
> 3.2, ADSM 3.1 Lvl 2.1, DB-sizes (NT 14 GB/70% util,Netware 6 GB/40%
> util, Unix 4 GB/70% util), BUFPoolsize 16384, LOGPoolsize 4096,
> collocation is enabled, our backuppools on DASD (EMC 3390) are migrated
> every day to MagStar tapes until the low treshold of 0% is reached,
>
> Before we have upgraded to Server Version 3, the performance of the
> backup processes was poor, now the performance of backup is ok and the
> recover peformance is still bad. Last week we had to make a disaster
> recovery of a NT server. The amount of data was 7 GB and it took 25
> (in words: twenty-five) hours. This is about 85 KB/s.
>
> Does anyone have experience with such a behavior and wants to share ?
> Any ideas are welcome.
>
>         :-)     Stefan Seibt
>                 Alte Leipziger Versicherungen
>                 Abteilung WS-SP
>                 Alte-Leipziger-Platz 1
>                 61440 Oberursel
>
>                 Tel: +49 (0)6171 66-2375
>                 Fax: +49 (0)6171 66-7500 2375
>