This is how I installed the Equallogic SAN on an IBM eSeries server with AIX 5.2 ML9. AIX maintenance level 7 and above has native iSCSI drivers. Anything older then you will need to download the Cisco iSCSI drivers from Equalogic or Cisco’s website.
First create the volume on the SAN, this is pretty easy and intuitive with Equallogic and I will not dwell on that here.
To check if the iSCSI driver is installed, go into SMIT, devices and you should see the iSCSI heading. Select iSCSI, iSCSI Protocol Device, and then Change / Show Characteristics. You will see the iSCSI initiator name.
To list all installed physical disk enter below command and you will see something similar. This is the before SAN picture.
lsdev -C -c disk
hdisk0 Available 1S-08-00-8,0 16 Bit LVD SCSI Disk Drive
hdisk1 Available 1S-08-00-9,0 16 Bit LVD SCSI Disk Drive
hdisk2 Available 1S-08-00-10,0 16 Bit LVD SCSI Disk Drive
hdisk3 Available 1S-08-00-11,0 16 Bit LVD SCSI Disk Drive
hdisk4 Available 25-08-00-8,0 16 Bit LVD SCSI Disk Drive
hdisk5 Available 25-08-01-8,0 16 Bit LVD SCSI Disk Drive
To enable and use the iSCSI volume as a hdisk device under AIX, it needs to be added to the targes file.
Edit /etc/iscsi/targets and add the following line:
10.10.24.50 3260 iqn.2001-05.com.equallogic:6-8a0900-594956401-a94000003e0460
92-iscsi-production
Replace the IP 10.10.24.50 with your SAN group IP, the default SAN port is 3260, IQN name begins with iqn. you can get this from your SAN configuration.
To process the targets file and initialize the iSCSI device you can reboot the server or run the following cfgmgr command (no reboot required).
cfgmgr -l iscsi0
If everything works, ‘lsdev -C c disk’ should show the SAN disks such as:
lsdev -Ccdisk
hdisk0 Available 1S-08-00-8,0 16 Bit LVD SCSI Disk Drive
hdisk1 Available 1S-08-00-9,0 16 Bit LVD SCSI Disk Drive
hdisk2 Available 1S-08-00-10,0 16 Bit LVD SCSI Disk Drive
hdisk3 Available 1S-08-00-11,0 16 Bit LVD SCSI Disk Drive
hdisk4 Available 25-08-00-8,0 16 Bit LVD SCSI Disk Drive
hdisk5 Available 25-08-01-8,0 16 Bit LVD SCSI Disk Drive
hdisk6 Available Other iSCSI Disk Drive
Viola, the SAN volume has been installed as a physical disk in AIX. Now you simply have to create the volume group, create logical volume and create the filesystem.
I also recommend tweaking the network card and TCP/IP packets for optimal SAN performance. I will explain that after I have completed it on my AIX server, I am still waiting for the order of two 1G NICs. I am planning on turning on jumbo frame complete with fault tolerent NIC.
