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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