OEL 5 SAN connection w/ ports

We have an HP EVA SAN which we have allocated a disk group, then the LUN, then the Virtual Disk and the ports as we should, this being done w/ the HP installer on site. We present it to OEL and it shows each of the four ports as 'sda<1-4>'
For testing I created directories 'tmp-sda<1-4>'
then issue
mount /dev/sda<1-4> /tmp-sda<1-4>
for each one
all are mounted w/o an issue
I create a file
touch x
x is seen on all the mount points
the issue is when I alter the contents of x on say mount point 'tmp-sda1', save it, and open the x file from mount point 'tmp-sda3' the change is not there. We were told by the HP person that the driver we installed, that being for RHEL5, should make all the ports seen as one port and this should not happen.
Has anyone run into this? Or can someone shed some light on how SAN ports are presented and handled by OEL5, I can't find any docs on this
Some output of the above is below
Thanks,
Steve
[root@rac01 tmp-sda1]# uname -rm
2.6.18-128.el5 x86_64
[root@rac01 tmp-sda1]# cd /dev
[root@rac01 dev]# ls sd*
sda sda1 sdb sdb1 sdc sdc1 sdd sdd1
[root@rac01 dev]# cd ~
[root@rac01 ~]# ls tmp*
tmp-sda1:
lost+found x x~
tmp-sdb1:
lost+found x x~
tmp-sdc1:
lost+found x x~
tmp-sdd1:
lost+found x x~
[root@rac01 ~]# df -h tmp-sda1
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 9.9G 151M 9.2G 2% /root/tmp-sda1

Ah! the joy of playing with multiple paths to your storage :-)
The reason you are not seeing your updates, is because you are not writing directly to your disks with linux, but doing things against the buffercache of linux. And linux considers the multiple paths to the storage as independed disks, so it doesn't know that when you are updating something in the first path, it should be the same for the other path's.
You need to setup a meta-device which does multipathing, and leave the direct disks alone.
Here's a guide how to set it up (it says dell, but configuring the device mapper is the same): http://www.dell.com/downloads/global/power/ps3q06-20060189-Michael.pdf

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