Linux iSCSI Target using open-iscsi

I recently set up an iSCSI SAN for use with VMWare Server. The set up was basically a Linux Ubuntu Server target with 2 network links to a single VNWare Server as the integrator. I also included iSCSI multi-pathing by enabling it on the initiator (VMWare Server).

This is how I set up an Linux SAN Target with iSCSI, interfacing with VMWare 5.1. as the iSCSI Initiator.

Part 1: Setting up our iSCSI Target with Linux

  1. Let’s set up our network interfaces that will be used for the SAN connection.

    I chose two separate /30 networks. If you remember a /30 only has 2 usable host IPs. This ensures that our iSCSI Target and Imitator are the only IPs on the network. No use in using a larger network, as it will be wasted with our Point-to-Point Ethernet link.
  2. Creating LUNs. I decided to use a flat file for my LUN images. You can use other storage devices, such as a /dev/sdX devices,etc. I just thought it would be easier to keep track of the LUNs if they were files…not sure if this is best practice…anyway!

    This will create a zero’d LUN01.img file with the size of 10GBs
  3. Prepare the LUN, and partition it.

    Create a new partition 1, type fb (VMFS)
    i SCSI8
  4. On the iSCSI target, install the following packages:

    This will install the necessary packages to run the iSCSI target service. Also install the following packages for troublshooting purposes. These packages can be used to impersonate an iSCSI initirator connection.
  5. Start the iSCSI Target service and make sure it starts successfully.
  6. Edit the ietd.conf file to identify the LUNs you will advertise.
  7. Restart the iSCSI Target Service:

Part 2: Setting up VMWare ESXi 5.1

  1. Assuming you have installed VMWare and have two(2) Ethernet interfaces to use to hook into a SAN network. We will start by setting up the Network Adapters.
    IP the two(2) Ethernet Network Adapters
    i SCSI3i SCSI4 (Do this for both Network Adapters)
  2. You should now see a iSCSI Storage Adapter Available.
    i SCSI
  3. Right-Click on the iSCSI Adapter and go to Properties. Here we have to set the iSCSI Discovery Address.
    i SCSI15
  4. Click on the iSCSI Adapter, you should see in the bottom pane the LUN being advertised by our iSCSI Target.
    i SCSI6
    NOTICE: We have 2 paths going to our LUN?? (This is a good thing! We have to set up multipathing…but later!)
  5. Provision the LUN Storage to be used with VMWare.
    Under Storage, click on the far Right the “Add Storage” Link and follow the following prompts to provision the LUN for use with VMWare.
    i SCSI9i SCSI10
    i SCSI11i SCSI12

    Wait for the drive to be provisioned.
    i SCSI13

  6. You should now have a Storage LUN available for use with VMWare.
    i SCSI14
  7. Set up Mutlipathing..
    Click on the LUN under Storage. Right Click and go to Properties.
    Next, click on Manage Paths.i SCSI16

    Click on Manage Paths, in the following prompt, change
    i SCSI7

Part 3: Limiting iSCSI Access

You can limit the access of the iSCSI connection by editing the initiator.allow and/or targets.allow.

  • Edit the initiators.allow, this file limits the allowed initiators by either their IQN, IP, or IP Subnet.
  • Edit the targets.allow, this file limits the allowed targets. (I’ve limited to the follow IPs so the only IPs used on the Target to those that are part of the Multipathing that we set up from above.)

Source:

There are 4 comments left Go To Comment

  1. Robert /

    VMware hyper-V, is that like IBM Apple?

    1. thejimmahknows / Post Author

      Haha, you are correct sure. Fixed the title. Thanks!

  2. Kevin /

    Do you use such configurations for production use or just testing/playing?

    1. thejimmahknows / Post Author

      Hi Kevin, this paticular setup was put together for this Post. However, I did use open-iscsi as a SAN iSCSI backend to host this site!! I’ve recently moved to FiberChannel because I was able to obtain a few FiberChannel HBAs. See http://thejimmahknows.com/linux-fibre-channel-scsi-target-using-scst/

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