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How to find the boot disk from HP-UX

Q: I need to document which disk was used to boot the currently running system.

A: This is a bit tricky depending on the version of HP-UX, and whether it is using LVM or the less common choice, VxVM for disk volume management. Here are the steps:

For LVM disk layouts:

For 11.11 and earlier, use the command:

# echo “boot_string/S” | adb -k /stand/vmunix /dev/kmem
    boot_string:    disk(0/0/2/;0)/stand/vmunix

For 11.23, there are different ways for PARISC versus IA64:


# echo “boot_string/S” | adb -o /stand/vmunix /dev/kmem
    boot_string:    disk(1/0/0/3/;0)/stand/vmunix

IA64 (Itanium/Integrity):

# echo “bootdev/x” | adb -n /stand/vmunix /dev/kmem

Now to find the actual path, you’ll have to match the 0x100001c value to a minor number in the /dev/disk directory. Compare only the last 6 digits of the number (00001c) to find the device file. Then by using lssf, you can decode the hardware path:

    # DSK=$(ll /dev/disk | awk ‘/00001c/{print $NF}’)
    # echo $DSK

    # HWPATH=$(lssf /dev/disk/$DSK | awk ‘{print $(NF-1)}’)
    # echo “$DSK path = $HWPATH”
    disk11_p2 path = 64000/0xfa00/0xa

You can use ioscan -m dsf to map agile device file names to legacy (CTD) style.
For VxVM disk layouts:

# echo “raw_root/X” | adb -o /stand/vmunix /dev/kmem
     raw_root:       0x3000002

This value is the minor number for the disk that was used to boot the current system.
The minor number is found in the /dev/vx/dmp directory.
Match just the last 6 digits to find the disk. It will be in legacy format.

     # DSK=$(ll /dev/vx/dmp | awk ‘/000002/{print $NF}’)
     # echo $DSK

     # HWPATH=$(lssf /dev/dsk/$DSK | awk ‘{print $(NF-1)}’)
     # echo “$DSK path = $HWPATH”
     c2t1d0s2 path = 0/1/1/0.1.0


For completeness, I should mention that 11.31 will report the boot disk path in syslog.log (LVM or VxVM) like this:

    vmunix: Boot device’s HP-UX HW path is: 0/1/1/0.0×1.0x0

However, syslog.log is a catch-all for a lot of items and often needs to be truncated when it grows too large. As a result, it can’t be relied on to always contain the current boot disk.

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Categories: HP-UX