Hiya experts

I have a client that would like to implement AIX LVM based disk
replication for an Oracle based app over 2 sites about 20miles apart.
Much the same concept as GLVM ( www-03.ibm.com/systems/p/os/aix/
whitepapers/aix_glvm.html ) but without the TCP encapsulation
There is already a good (quick/low latency links) SAN fabric that
spans both sites

Can anyone think of reasons why this is not a good idea? eg situations
where a FS buffer may not flush, jfs2 logs may not sync, MWC log issue
(MWC would be switched to passive mode and mirroring would be
asynchronous)
(No ora resilvering as JFS2 is used not raw devices)

ie Whats wrong with poor mans disk replication from 5.3s LVM? (ora
dataguard, SAN based replications, HACMP/XD and GLVM are all out for
various reasons)

I'm not too worried about lost data (as RPO/RTO are in order of days
as it stands) but what I don't EVER want is to have the VG/PV/JFS2/ORA/
etc in some state I cant syncvg -f or fsck or redo log my way out
of!!!

Would JFS2 snapshots and logshipping provide a safer
alternative? ...or rsync

Thanks in advance for any and all thought time and comments!