RHEL: Checking HBAs

# Tested on RHEL 6


# Show the instances of FC ports connected to the pci bus:

lspci | grep -i "Fibre"
   07:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)
   07:00.1 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)



systool -c fc_host
   Class = "fc_host"

     Class Device = "host1"
       Device = "host1"

     Class Device = "host2"
       Device = "host2"


# "systool -c fc_host" command in verbose mode shows the WWN of our HBAs (port_name).
# In the example below, the WWNs of our HBAs are '5001438028cb8124' & '5001438028cb8126'
# respectively

systool -c fc_host -v
   Class = "fc_host"

     Class Device = "host1"
     Class Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1/fc_host/host1"
       dev_loss_tmo        = "16"
       fabric_name         = "0x10000005339ade00"
       issue_lip           = <store method only>
       max_npiv_vports     = "254"
       node_name           = "0x5001438028cb8125"
       npiv_vports_inuse   = "0"
       port_id             = "0x1aab00"
       port_name           = "0x5001438028cb8124"
       port_state          = "Online"
       port_type           = "NPort (fabric via point-to-point)"
       speed               = "8 Gbit"
       supported_classes   = "Class 3"
       supported_speeds    = "1 Gbit, 2 Gbit, 4 Gbit, 8 Gbit"
       symbolic_name       = "HPAJ764A FW:v7.00.01 DVR:v8.05.00.03.06.5-k2"
       system_hostname     = ""
       tgtid_bind_type     = "wwpn (World Wide Port Name)"
       uevent              =
       vport_create        = <store method only>
       vport_delete        = <store method only>

       Device = "host1"
       Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1"
         fw_dump             =
         nvram               = "ISP "
         optrom              =
         optrom_ctl          = <store method only>
         reset               = <store method only>
         sfp                 = ""
         uevent              = "DEVTYPE=scsi_host"
         vpd                 = "$"


     Class Device = "host2"
     Class Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/host2/fc_host/host2"
       dev_loss_tmo        = "16"
       fabric_name         = "0x10000005339ac200"
       issue_lip           = <store method only>
       max_npiv_vports     = "254"
       node_name           = "0x5001438028cb8127"
       npiv_vports_inuse   = "0"
       port_id             = "0x20ab00"
       port_name           = "0x5001438028cb8126"
       port_state          = "Online"
       port_type           = "NPort (fabric via point-to-point)"
       speed               = "8 Gbit"
[...]




# For each FC initiator port should have an instance under /sys/class/fc_host

ll /sys/class/fc_host/
   total 0
   lrwxrwxrwx 1 root root 0 Mar 25 11:53 host1 -> ../../devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1/fc_host/host1
   lrwxrwxrwx 1 root root 0 Mar 25 11:53 host2 -> ../../devices/pci0000:00/0000:00:03.0/0000:04:00.1/host2/fc_host/host2


# If FC have never been scanned before, LUNs are not yet visible to the system and commands
# like "multipath" or "systool" won't be able to show the LUNs


ll /sys/class/fc_transport/
   total 0

systool -c fc_transport -v
   Class = "fc_transport"


# Let's see what happens after scanning the FC. Based on the FC instances found before:

echo "- - -" >> /sys/class/scsi_host/host1/scan
echo "- - -" >> /sys/class/scsi_host/host2/scan


ll /sys/class/fc_transport/
   total 0
   lrwxrwxrwx 1 root root 0 Apr  3 10:27 target1:0:0 -> ../../devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1/rport-1:0-0/target1:0:0/fc_transport/target1:0:0
   lrwxrwxrwx 1 root root 0 Apr  3 10:27 target1:0:1 -> ../../devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1/rport-1:0-1/target1:0:1/fc_transport/target1:0:1
   lrwxrwxrwx 1 root root 0 Apr  3 10:27 target2:0:0 -> ../../devices/pci0000:00/0000:00:03.0/0000:04:00.1/host2/rport-2:0-0/target2:0:0/fc_transport/target2:0:0
   lrwxrwxrwx 1 root root 0 Apr  3 10:27 target2:0:1 -> ../../devices/pci0000:00/0000:00:03.0/0000:04:00.1/host2/rport-2:0-1/target2:0:1/fc_transport/target2:0:1


systool -c fc_transport
   Class = "fc_transport"

     Class Device = "0:0"
       Device = "target1:0:0"

     Class Device = "0:0"
       Device = "target2:0:0"

     Class Device = "0:1"
       Device = "target1:0:1"

     Class Device = "0:1"
       Device = "target2:0:1"



# Now, we are also able to see the LUNs attached to the server (if any) via "multipath"

multipath -ll
   200255c3a1108000e dm-2 NEC,DISK ARRAY
   size=15G features='0' hwhandler='1 alua' wp=rw
   |-+- policy='round-robin 0' prio=130 status=active
   | |- 1:0:0:0 sdc 8:32  active ready running
   | `- 2:0:1:0 sdi 8:128 active ready running
   `-+- policy='round-robin 0' prio=10 status=enabled
     |- 2:0:0:0 sdg 8:96  active ready running
     `- 1:0:1:0 sde 8:64  active ready running
   200255c3a1108000f dm-3 NEC,DISK ARRAY
   size=160G features='0' hwhandler='1 alua' wp=rw
   |-+- policy='round-robin 0' prio=130 status=active
   | |- 1:0:1:1 sdf 8:80  active ready running
   | `- 2:0:0:1 sdh 8:112 active ready running
   `-+- policy='round-robin 0' prio=10 status=enabled
     |- 1:0:0:1 sdd 8:48  active ready running
     `- 2:0:1:1 sdj 8:144 active ready running




# "systool -c fc_transport" command in verbose mode can give some interesting information
# like the WWNN of the ports of the Fibre Channel storage servers (port_name)

systool -c fc_transport -v
   Class = "fc_transport"

     Class Device = "0:0"
     Class Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1/rport-1:0-0/target1:0:0/fc_transport/target1:0:0"
       node_name           = "0x200000255c3a1108"
       port_id             = "0x031500"
       port_name           = "0x220000255c3a1108"
       uevent              =

       Device = "target1:0:0"
       Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1/rport-1:0-0/target1:0:0"
         uevent              = "DEVTYPE=scsi_target"


     Class Device = "0:0"
     Class Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/host2/rport-2:0-0/target2:0:0/fc_transport/target2:0:0"
       node_name           = "0x200000255c3a1108"
       port_id             = "0x1fdb00"
       port_name           = "0x2f0000255c3a1108"
       uevent              =

       Device = "target2:0:0"
       Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/host2/rport-2:0-0/target2:0:0"
         uevent              = "DEVTYPE=scsi_target"


     Class Device = "0:1"
     Class Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1/rport-1:0-1/target1:0:1/fc_transport/target1:0:1"
       node_name           = "0x200000255c3a1108"
       port_id             = "0x032600"
       port_name           = "0x2a0000255c3a1108"
       uevent              =

[...]




# To look at information regarding the SCSI adapters present ('-v' for verbose):

systool -c scsi_host
   Class = "scsi_host"

     Class Device = "host0"
       Device = "host0"

     Class Device = "host1"
       Device = "host1"

     Class Device = "host2"
       Device = "host2"

     Class Device = "host3"
       Device = "host3"

     Class Device = "host4"
       Device = "host4"



# To see what Fibre Channel devices are connected to the Fibre Channel HBA cards:

systool -c fc_remote_ports -d
   Class = "fc_remote_ports"

     Class Device = "0-0"
       Device = "rport-1:0-0"

     Class Device = "0-0"
       Device = "rport-2:0-0"

     Class Device = "0-1"
       Device = "rport-1:0-1"

     Class Device = "0-1"
       Device = "rport-2:0-1"


systool -c fc_remote_ports -v -d
   Class = "fc_remote_ports"

     Class Device = "0-0"
     Class Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/host1/rport-1:0-0/fc_remote_ports/rport-1:0-0"
       dev_loss_tmo        = "864000"
       fast_io_fail_tmo    = "5"
       node_name           = "0x200000255c3a1108"
       port_id             = "0x031500"
       port_name           = "0x220000255c3a1108"
       port_state          = "Online"
       roles               = "FCP Target"
       scsi_target_id      = "0"
       supported_classes   = "Class 3"
       uevent              =


     Class Device = "0-0"
     Class Device path = "/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/host2/rport-2:0-0/fc_remote_ports/rport-2:0-0"
       dev_loss_tmo        = "864000"
       fast_io_fail_tmo    = "5"
       node_name           = "0x200000255c3a1108"
       port_id             = "0x1fdb00"
       port_name           = "0x2f0000255c3a1108"
       port_state          = "Online"
[...]




# For information on SCSI disks connected to a system ('-v' for verbose):

systool -c scsi_disk
Class = "scsi_disk"

  Class Device = "0:0:0"
    Device = "0:0:0:0"

  Class Device = "0:0:0"
    Device = "1:0:0:0"

  Class Device = "0:0:0"
    Device = "2:0:0:0"

  Class Device = "0:0:1"
    Device = "0:0:0:1"

  Class Device = "0:0:1"
    Device = "1:0:0:1"

  Class Device = "0:0:1"
    Device = "2:0:0:1"

  Class Device = "0:1:0"
    Device = "1:0:1:0"

  Class Device = "0:1:0"
    Device = "2:0:1:0"

  Class Device = "0:1:1"
    Device = "1:0:1:1"

  Class Device = "0:1:1"
    Device = "2:0:1:1"



# To show more disk information including which hosts are connected to which disks:

systool -b scsi -v

[...]

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