NO don't stripe the data... if you really watch ADSM you will note that is
spreads its activity across logical volumes assigned to it
When we striped it slowed us down...
Just define 50 9 GB files, one per physical device (and I'd make about 10
file systems with 5 vols per file sys)
We don't mirror our diskpool, yes periodically we might have a small amount
of data loss but the actual production machine is still running and if it
has any problem with a loss of a backup it can just push another one (our
main backups are large data base archives)

what I've done and things work fine... at first I worked really hard at
positioning DB vols & LOG vols as the first devices our of an SSA loop and
made stgvols all the disks in the middle but anymore I just make sure DB's &
logs and DBcopies & log copies are across different drawers on different SSA
cards if possible

later,
    DWight



> ----------
> From:         Way Milk[SMTP:loudway AT YAHOO DOT COM]
> Reply To:     ADSM: Dist Stor Manager
> Sent:         Tuesday, February 08, 2000 4:16 PM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Disk pool layout, pls help!
>
> Hi, *SM Gurus:
>
> I really need you guys help on this one:
> I need to create a disk pool around 450G (50 9G disks)
> . My basic layout would be: create 10 logical volume,
> each lv spans on 5 disks. When creating the LVs, There
> is three policies I can use 1) RANGE of physical
> volumes set to minimum, which mean use them
> sequetially, 2) RANGE of physical volumes set to MAX,
> which means use soft-stripping with stripping block
> size=PP size (16Mb) 3) use striping, set the blksize
> to 4,8,16,32,56,128k.
>
> What is the efficent way to layout on disk pool setup?
> Should I use striping or not? If striping is
> prefrered, what should be the striping block size, 4k
> ,16k or 56k?
>
> What is you guys current setting, if you also have a
> huge diskpool?
>
> Thanks a lot
>
> Ming
>
> AIX system specialist
>
> __________________________________________________
> Do You Yahoo!?
> Talk to your friends online with Yahoo! Messenger.
> http://im.yahoo.com
>