Grant,

I'm using the disk-stgpool in order to raise the cuncurrency of the
backups sessions. So I cannot say much about which one is faster
disk-pool or tape-pool, also because it depends on the tape drive you're
using. Certainly your performaces are very bad!

Yes it does fill up all the volumes at the same time ... what's the wrong
with that? More volumes means more disks (sometimes) whhich in turns
means better performances!

Are you sure your bad performances aren't dependent from other
bottleneck, like LAN connections (100FX vs 100HX), client compression or
so on?

Ciao Mauro

> Greetings all
>
> I have just tried to use SSA disks as a primary storage pool for one of
our
> NT clients (running ADSM 3.1.0.7)
>
> 1. I created a storage pool with a device class of DISK (Using RS6000
AIX
> 4.1.5 & ADSM server 3.1.2.20)
> 2. Formatted 10 1.5 Gb files on the SSA disks using dsmfmt -m -data
> xxxxxxxxxxxx 1500
> 3. Defined these disk storage pools to my storage pool created in 1.
above
> 4. Created a Mgmnt class to use this new storage pool
> 5. Changed my dsm.opt file on the NT server to use this mgmnt class
> 6. Ran a first-time incremental backup on one of the drives.
>
> While the backup was executing I noticed that all 10 of my disk storage
> volumes were being used at the same time, i.e. they were all filling at
the
> same time.
>
> Worst of all - this backup took 1h45 mins to backup 2.8 Gb.
> To compare, I am backing up 20Gb to tape in 2h10mins on another NT
server
> connected on the same network.
>
> Anybody with ideas, firstly why it used all 10 volume (disk files) at
the
> same time, and secondly why the performance is so slow. I would expect
disk
> storage to be faster.
>
>
> Many thanks
>
> Grant Cohn
> Shell & BP Petroleum Refineries
> Prospecton
> DURBAN
> South Africa.