Wednesday, December 9, 2009

Linux iSCSI Target Setup

I am working on setting our NAS device with iSCSI so that I can run VMware hosts externally. Here are my notes for setting up the iSCSI target and initiator. I am using Ubuntu 9.10 (latest version at the time.) I will be using a 160GB drive and dedicating it solely to run the mount points.

The iSCSI protocol is a storage area network (SAN) protocol which allows iSCSI initiators to use storage devices on the (remote) iSCSI target using normal ethernet cabling. To the iSCSI initiator, the remote storage looks like a normal, locally-attached hard drive. (Initiator): IP address (Target): IP address

Setting up the target [server2]

Installing the software
apt-get install iscsitarget
Modify the config file for iscsitarget
nano /etc/default/iscsitarget
Now enable the ISCSITARGET
NOTE: You can use logical volumes, image files, hard drives [/dev/sdb], partitions [/dev/sdb1] or RAID devices [/dev/md0] for storage.

I am going to use the entire 160GB HDD for iSCSI located at sdb1

Edit ietd.conf
nano /etc/ietd.conf
Make sure everything is commented out except what is below
        # Users, who can access this target. The same rules as for discovery
        # users apply here.
        # Leave them alone if you don't want to use authentication.
        # Logical Unit definition
        # You must define one logical unit at least.
        # Block devices, regular files, LVM, and RAID can be offered
        # to the initiators as a block device.
        Lun 0 Path=/dev/sdb,Type=fileio
        # Alias name for this target
        Alias LUN1
NOTE: The target name must be a globally unique name, the iSCSI standard defines the "iSCSI Qualified Name" as follows: iqn.yyyy-mm.[:identifier]; yyyy-mm is the date at which the domain is valid; the identifier is freely selectable. The IncomingUser line contains a username and a password so that only the initiators (clients) that provide this username and password can log in and use the storage device; if you don't need authentication, don't specify a username and password in the IncomingUser line. In the Lun line, we must specify the full path to the storage device (e.g. /dev/vg0/storage_lun1, /storage/lun1.img, /dev/sdb, etc.).

Now you can limit the access by IP address
nano /etc/initiators.allow
Add this into the editor
Now start the service
/etc/init.d/iscsitarget start
I will post an article about connecting to the target from another Linux, Mac or Windows Host in the near future. From VMware ESXi and vSphere 4 just add the vKernel and then in the administration section for storage just type in the IP address of the target. I installed 4 VM Guests on vSphere to test and it worked great.

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