Installing Open iSCSI software with the
Myri-10G 10-Gigabit Ethernet Driver

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• Install a Linux distribution with a 2.6.14 kernel or newer on the Target node.

• Download, compile and load the Linux Myri10GE driver with an MTU of 9000.

• Enable TSO on the Myri10GE driver.

• Download the iSCSI Target (iscsitarget-0.4.13.tar.gz) from SourceForge, and follow the installation instructions in the README to install this software on one of the two nodes. In the /etc/ietd.conf file:

  • Set up a LUN. For benchmarking, use a null device by setting Type=nullio.
  • Set InitialR2T to 'No'
  • Set ImmediateData to 'Yes'
  • Set MaxRecvDataSegmentLength to 262144

• If you intend to use iSCSI Digests, it is easiest to enable their use on the Target and then have the Initiator negotiate them on or off. To enable them on the Target:

  • Set HeaderDigest to 'CRC32C,None'
  • Set DataDigest to 'CRC32C,None'

• Load the iSCSI Target module and daemons

  su root
  /etc/init.d/iscsi-target start
  

  and verify startup in the output in dmesg.

• Install a Linux distribution with the 2.6.14 or 2.6.15 kernel on the Initiator node.

• Download, compile and load the Linux Myri10GE driver with an MTU of 9000.

• Enable TSO on the Myri10GE driver.

• Download, uncompress and untar iSCSI Initiator (open-iscsi-1.0-485.tar.gz) from the Open-iSCSI website.

• Install the open-iSCSI Initiator as per the README in top-level directory. As the README explains, you will need to patch the open-iSCSI kernel module with the kernel/2.6.14-and-2.6.15-compat.patch.

• Set up /etc/initiatorname.iscsi with a valid initiator name.

• Start the daemon and log the Initiator into the daemon with the iscsiadm command.

• Determine the name of the iSCSI disk on the Initiator from the output in dmesg. You may now treat this disk as a local disk. I.e., create a filesystem on it or run iometer or disktest against it.

• To turn on or off Software header and data digests, first log the Initiator off of the Target, then use the DataDigest and HeaderDigest keys with the iscsiadm command. E.g. to enable software iSCSI data digest:

      iscsiadm -m node -r c98eb6 -o update -n  node.conn[0].iscsi.DataDigest -v CRC32C
  

Last updated: 30 January 2007

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