Extracting Disk Details (Size, LUN ID, and WWPN) on IBM AIX

Managing storage on IBM AIX systems often requires gathering detailed information about disks — including their size, LUN ID, and WWPN (World Wide Port Name) of the Fibre Channel adapters they connect through.

This information is especially useful for SAN teams and system administrators when verifying storage mappings, troubleshooting, or documenting configurations.

In this post, we’ll look at a simple shell script that automates this task.

The script:

• Loops through all disks known to AIX (lspv output).
• Extracts each disk’s LUN ID from lscfg.
• Gets its size in GB using bootinfo.
• Finds all FC adapters (fcsX) and displays their WWPNs.
• Prints a consolidated, easy-to-read summary.

The Script

#!/bin/ksh
for i in $(lspv | awk '{print $1}')
do

# Get LUN ID
LUNID=$(lscfg -vpl "$i" | grep -i "LIC" | awk -F. '{print $NF}')

# Get size in GB
DiskSizeMB=$(bootinfo -s "$i")
DiskSizeGB=$(echo "scale=2; $DiskSizeMB/1024" | bc)

# Loop over all FC adapters
for j in $(lsdev -Cc adapter | grep fcs | awk '{print $1}')
do
WWPN=$(lscfg -vpl "$j" | grep -i "Network Address" | sed 's/.*Address[ .]*//')
echo "Disk: $i Size: ${DiskSizeGB}GB LUN ID: $LUNID WWPN: $WWPN"
done
done

How It Works:

• lspv lists all disks managed by AIX (e.g., hdisk0, hdisk1).
• lscfg -vpl hdiskX displays detailed configuration information for each disk, including the LUN ID.
• bootinfo -s hdiskX returns the disk size in megabytes.
• lsdev -Cc adapter | grep fcs lists all Fibre Channel adapters (fcs0, fcs1, etc.).
• lscfg -vpl fcsX | grep "Network Address" shows the adapter’s WWPN.
• sed 's/.*Address[ .]*//' cleans the output, leaving only the WWPN value.

Example Output:
Disk: hdisk0 Size: 100.00GB LUN ID: 500507680240C567 WWPN: C0507601D8123456
Disk: hdisk0 Size: 100.00GB LUN ID: 500507680240C567 WWPN: C0507601D8123457
Disk: hdisk1 Size: 200.00GB LUN ID: 500507680240C568 WWPN: C0507601D8123456
Disk: hdisk1 Size: 200.00GB LUN ID: 500507680240C568 WWPN: C0507601D8123457

This shows each disk (hdiskX) with its size, LUN ID, and all connected FC adapter WWPNs.