OS not able to properly create filesystem

Linux Tips & Tricks
1

Hi,

I have a task of creating filesystem from an external HP 3PAR storage.
The OS is RHEL 5.8.

These were the steps I used for the OS to detect the allocated storage to the server :

  1. Scan for available hosts in system :
# ls /sys/class/fc_host
  1. Run the following commands to scan the LUN
$ echo "- - -" > /sys/class/scsi_host/host3/scan

$ echo "- - -" > /sys/class/scsi_host/host4/scan
  1. Now edit /etc/multipath.conf and add the following:
blacklist_exceptions {
        wwid "360002ac0000000000000008e0001ee00"
        wwid "360002ac0000000000000008f0001ee00"
        wwid "360002ac000000000000000900001ee00"
        wwid "360002ac000000000000000910001ee00"
        wwid "360002ac000000000000000920001ee00"
        wwid "360002ac000000000000000930001ee00"
}
  1. Run the command :
# multipath -v2

The problem starts here, whereby I don’t see any output :

[root@csixdb1 ~]# multipath -v2
[root@csixdb1 ~]#

Even when I use multipath -ll, there is no output :

[root@csixdb1 ~]# multipath -ll
[root@csixdb1 ~]#

I have already started the service :

root@csixdb1 ~]# /etc/init.d/multipathd status
multipathd (pid  29995) is running...
[root@csixdb1 ~]#

Is there any steps I am missing out ? How do I know if the device is detected, and what is the name of the device?