How to connect a Linux host to an Equallogic volume.

Steps:

• Installing the iSCSI initiator:

  • Run the commands:

    • # yum list | grep iscsi  to check if the iscsi-initiator-utils package is already installed or needs to be installed.

    • # yum install iscsi-initiator-utils.xxx_xx  to install the iscsi-initiator-utils package if it is not already installed

    • # service iscsi start  to start the iSCSI Initiator daemon.

    • # chkconfig iscsi on  to enable the service to start at boot.

•  Configure disk timeout settings from 30 to 60 Seconds:

  • For Red Hat operatig systems, use the follwoing script to update the timeout value: 

  • for i in ‘ls /sys/class/scsi_device‘;
    do echo "60" > /sys/class/scsi_device/$i/device/timeout;
    done

  • For Red Hat operatig systems, use the follwoing script to update the timeout value: 

  • for i in ‘ls /sys/class/scsi_disk‘;
    do echo "60" > /sys/class/scsi_disk/$i/device/timeout;
    done

• Discover and login to the Equallogic volume from the Linux host:

  • Run the commands:

    • # iscsiadm -m discovery -t sendtargets -p <Equallogic group's IP address>   To discover the volumes presented to the Linux host.

    • # iscsiadm -m node -T <iqn> -p <Equallogic group's IP address> --login  Replace <iqn> with iqn returned by the discovery command above.

   

• Find the newly created device:

  • Run the command:

    • # iscsiadm -m session -P3

Now you can create the file system using the mkfs command, or you can partition the disk first if you'd like. Alternatively, the LVM tool could be used to initialize the volume and assign  the space to a logical volume.

24.13.  Logging In to an iSCSI Target