RHEL 4U4 Filesystem alignment

Hi,

I'm setting up a SAN Boot system based on RHEL 4U4. During setup I'm trying to align the boot partition using fdisk. After aligning that partition the installer gives a lot of error messages that there is something wrong on the partition alignment.
Even after aligning the partition, the installer repartition the volume and all alignment are gone.
Has anybody done an similar installation?
In my case I'm using a small "/boot" partition (300MB) and the rest of the volume is an LVM volume group, in that case is it really necessary to align the first partition ?

Thanks for any hint.