Hi Gentlemen,
I ve created the LUN from the SAN and able to see these drives from the RH5 as /dev/sdb , /dev/sdc ,/dev/sdd and /dev/sde. And I edit the /etc/fstab file in order to be able to auto mount when reboot. But still not able to auto mount when rebooted or restart the iscsi service .
I use the ISCSI protocol to mount from the SAN.
Pls. take a look at the /etc/fstab here.

[root@REDHAT5 etc]# more fstab
/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/VolGroup00/LogVol01 swap swap defaults 0 0
/dev/iscsi/0a000/part /ATC ext3 _netdev 0 0
/dev/iscsi/0a006/part1 /LOG ext3 _netdev 0 0


root@REDHAT5 etc]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
136010792 10702456 118287792 9% /
/dev/sda1 101086 13540 82327 15% /boot
tmpfs 4062004 0 4062004 0% /dev/shm
/dev/sdb 516061624 693684 489153540 1% /ATC
/dev/sdf1 1056894128 204192 1003002848 1% /LOG
[root@ORACLE etc]#

From the "Logical Volume Management" I notice here.
Properties for Disk Entry
/dev/sdf1
size : 1024 .00 GB
Partition Type : Linux LVM ( 0x 8e )
Mount Point : /LOG
Mount Point when Rebooted : None
File System : Ext3
SCSI Address : 16:0:0:0
SCSI ID : 360060e80103294e004