Damon,
We currently have two DISKPOOLS defined, one backup and one archive.  We
have 3 mod-3 devices defined for BACKUP and 1 mod-3 defined for ARCHIVE.

We have mapped the entire volume as one virtual volume.

We have experienced no DASD performance problem backing up approx 150
mixed nodes (340 file spaces).  Some are large UNIX databases.
        I insisted that our storage pool volumes be located on RAID-1
DASD (we are using EMC), both for performance (and especially)
reliability/availability.
        Hope this helps.
> ----------
> From:         Damon Taylor[SMTP:dtaylor AT AMOCO DOT COM]
> Sent:         Wednesday, May 21, 1997 9:20 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Diskpool configurations on MVS.
>
>
>       I've asked this question once before and received no response so
> I'm
>      re-sending and begging this time as we are starting to see some
>      performance problems.
>
>       If you MVS ADSMers would be so kind as to enlighten me as to the
>      following:
>
>      1. How many DISKPOOLS do you have configured?
>
>      2. How many virtual volumes do you have configured for each
> physical
>         volume? What size?
>
>      3. How are your virtual volumes defined to the various DISKPOOLS.
>
>      4. Is anyone experiencing any performance or IO problems related
> to
>         ADSM hits on the DASD? If so how are you dealing with them?
>
>      We're desperately searching for some information so any light you
> can
>      shed would be greatly appreciated. Thanks in advance.
>
>      Damon Taylor
>
>      Amoco Corp.
>