I do not have any exact experience with doing this, but if you are using a jfs
formatted filesystem on AIX 4.2+, then you have to create the filesystem with
Large File Support (in the SMIT panel when creating the filesystem). If you do
not format the filesystem for Large File Support, then the 2GB filesize limit
still applies.

Peter Gathercole

Gerhard Rentschler wrote:

> Hi,
> I'm a little bit confused. I have AIX 4.2.1 and ADSM Server 3.1.1.3. In my
> opinion this configuration should allow database volumes in jfs with more
> than 2 GB. The  version 3 ref manual even has a new option -g for dsmfmt
> which allows to specify the size in gigabytes. However, before starting to
> really using such big db volumes I would like to ask whether my assumption
> is really true. Has anyone used db volumes in jfs > 2 GB?
> Best regards
> Gerhard
>
> -----Original Message-----
> From:   Peter Gathercole [SMTP:peter.gathercole AT virgin DOT net]
> Sent:   Sunday, August 02, 1998 1:13 AM
> To:     ADSM-L AT VM.MARIST DOT EDU
> Subject:        Re: database volumes
>
> This is almost certainly the 32-bit signed integer problem. Unless ADSM is
> specifically written for the new 64-bit file system at AIX 4.2.1 or later
> (which I doubt), then 2GB is the largest database size possible. The fault
> is that when doing an lseek (this is a AIX/Unix low level function to
> position the current pointer in a file), the offset is a 32 bit signed
> integer, whose limits are -2GB through +2GB-1.
>
> Peter Gathercole.
>
> Gerhard Rentschler            email: g.rentschler AT rus.uni-stuttgart DOT de
> Regional Computing Center     tel.   ++49/711/685 5806
> University of Stuttgart       fax:   ++49/711/682357
> Allmandring 30a
> D 70550 Stuttgart
> Germany