Rescan LUN with command

By - 


echo "- - -" > /sys/class/scsi_host/host0/scan


to know what will come in place of "host0 or host1" 


Run the below command to know this


[root@fspnfs Nagios]# systool -c fc_host -v
Class = "fc_host"

  Class Device = "host5"
  Class Device path = "/sys/class/fc_host/host5"
    fabric_name         = "0x100000051ed40e68"
    issue_lip           = 
    node_name           = "0x2000001b32901fd0"
    port_id             = "0x010400"
    port_name           = "0x2100001b32901fd0"
    port_state          = "Online"
    port_type           = "NPort (fabric via point-to-point)"
    speed               = "4 Gbit"
    supported_classes   = "Class 3"
    supported_speeds    = "1 Gbit, 2 Gbit, 4 Gbit"
    symbolic_name       = "QLE2460 FW:v5.03.16 DVR:v8.03.07.03.05.07-k"
    system_hostname     = ""
    tgtid_bind_type     = "wwpn (World Wide Port Name)"
    uevent              = 

    Device = "host5"
    Device path = "/sys/devices/pci0000:00/0000:00:07.0/0000:1a:00.0/host5"
      ct                  =
      els                 =
      fw_dump             =
      nvram               = "ISP "
      optrom_ctl          = 
      optrom              =
      reset               = 
      sfp                 = ""
      uevent              = 
      vpd                 = "4"

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