Hi there,

We have 100Gb of disk stg pool for our primary pools. Under AIX, the
dsmfmt command for
a file that is nearly 100Gb takes more than 12 hours, so I use raw LV for
my primary stg pools.

Of course, I can not increase or reduce their size by adding or removing
a volume, but my
most important consideration is performance. Our disks are SSA 18Gb disks
and we rate
almost 8Mb/s when ADSM does not spend all its time to aggregate files.

For the DB and the LOG, i do not use raw LV because if one day I have a
problem, I want to be
able to copy my even-corrupted-db to another disk and to try to dump it.

Herve





        j.caupain @ AMSTERDAM.NL
        24/03/99 10:50
To: ADSM-L @ VM.MARIST.EDU
cc:  (bcc: Herve Chibois/FR/ABNAMRO/NL)
Subject: ADSM performance with raw locigal volumes

Hello everyone!

I have a question.
I'm using ADSM 3.1.2.0 on AIX 4.1.4.
Someone sugested using ADSM with raw locial volumes instead of
filesystems. Said that this would increase performance.
My question is: at what point do you decide to use raw logical volumes?

Thanx in advance for your reply,

Jerry Caupain