How to scan iscsi lun in linux

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  • How to scan iscsi lun in linux

    • Iscsiadm discovery

  • Iscsiadm rescan luns
  • Echo - - -'' > /sys/class/scsi_host/host0/scan
  • Iscsiadm list luns
  • First, run the following ISCSI rescan on one HV: iscsiadm -m node -R Find the name of your SAN device and compare its size with the size of your LUN.

    • Echo - - -'' > /sys/class/scsi_host/host0/scan...

    In this post  we will discuss how to scan new LUNs allocated by storage team to a Redhat Linux system.
    There are two ways of scanning the LUNs
    Method 1:-
    Find how many SCSI bus controllers you have

    • Go to directory /sys/class/scsi_host/  and list it’s contents.

    cd /sys/class/scsi_host/ [root@scsi_host]# lshost0 host1 host2[root@scsi_host]#
    • Here we can see we have three SCSI bus controllers.

      So in below command replace hostX with these directory names.

    Run the Command ,
    echo "- - -" > /sys/class/scsi_host/hostX/scan [root@cloudvedas]# echo "- - -" > /sys/class/scsi_host/host0/scan[root@cloudvedas]# echo "- - -" > /sys/class/scsi_host/host1/scan[root@cloudvedas]# echo "- - -" > /sys/class/scsi_host/host2/scan[root@cloudvedas]# echo "- - -" > /sys/class/scsi_host/host3/scanTIP:- Here the “- – -” denotes CxTxDx i.e.

    Channel(controller) , Target ID and Disk or LUN number. This is asked in Linux Admin Interviews also.

    • Repeat the above step for all three directories.
    If you have FC HBA in the system you can follow

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