Quick AIX question rooted in a z/OS concept

Hi all.

I know this isn't a z/OS question but I don't think any of us live in a
homogeneous environment and the best way I can think of asking this AIX
question is to word it in z/OS terminology.

I have an application developer who wants to have 2 AIX LPARs access
shared disk. He thinks he can just have me point the LUN on the SAN to
both LPARs and everything will work just fine. On my "Z", I can set up
GRS or a third-party competitor to this to serialize I/O requests from
various LPARs/machines. Is there something in AIX that performs a
similar function? I asked this of an AIX list and the response I got
back was something called GPFS which they say can do this.
Unfortunately it appears as though I would need to buy and activate
HACMP to use GPFS. Is there something else, more of a stand-alone
product like GRS that would allow me to share a disk LUN across multiple
AIX LPARs without having the LPARs step on each other?

Thanks and have a happy Friday.

Rex

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