The Effect of Device Replacement on Agile Device Files

Figure 1: Single path to a LUN

The following is the output from the ioscan command for the configuration in Figure 1:

# ioscan –m lun /dev/rdisk/disk1

disk 1 64000/0xfa00/0xa esdisk CLAIMED DEVICE online HP

HSV210

0/1/0/0.0x0x500508b3009097f9.0x4001000000000000

/dev/disk/disk1 /dev/rdisk/disk1

In this command output, the handle 64000/0xfa00/0xa is associated with the LU name

0x600508b3009097f0421745217a6c0057 and device instance number 1. This association is

persistently saved in the kernel registry and allows HP-UX to generate the same device special file

across system reboots. Note that the 1 at the end of the device special file name is the device instance

number and not the handle number.

In Figure 2, if an LU is presented via another target port based on the LU name, HP-UX associates the

newly discovered lunpath to an existing LU.