Update to USB Driver Support on HP-UX 11iv3 (April 2010)

3) Because of the dynamic nature of the USB bus and the devices on it, it is possible that

the association of device special files to actual USB devices may change in certain

circumstances.

a. When you disconnect a USB device at runtime and reconnect it to a different

port, the device special file may be different.

b. When you put a new USB device into a port previously occupied by another

device, the new device may have the same device special file as the old one did.

c. If you change the configuration of USB devices attached while a system is

running and leave any of those changes in place across a reboot, the mapping of

device special files to USB devices may change.

For these reasons, it is always advisable to check the mapping of device special file to

USB device before using it to make sure you are accessing the device you desire.

4) When attaching or detaching a device while the system is up, you may see the message:

“io_destroy_with_dsf: io_destroy failed” in the syslog. This is an internal message and is

expected.

5) No more than 16 USB mass storage devices can be attached to a given system at any

one time.

6) Ensure that all optical media used is clean and undamaged. Otherwise, I/O errors may

result in missing data or other failures.

DVD-write Usage Notes

DVD-write capability is supported with write capable DVD drives with the following provisos:

 DVD+R and DVD+RW media are the only media types supported.

 There is no Dual-Layer support at this time.

 Writes must be closed single session. We do not support Multisession capability.

Compatibility with Integrity Virtual Machines

The use of USB as virtual media for HPVM virtual devices works using HPVM 4.0 in combination

with the patches: PHSS_38566 and PHSS_38567.

If you install the latest USB-02 patch on a system which already has HPVM guests configured

and a USB DVD is used as a backing store for a virtual DVD in one or more of those guests, you

will very likely need to modify the mapping from the virtual DVD to the real USB DVD before the

guests will start. You will get a sequence such as:

# hpvmstart -P goldvm5

HPVM guest goldvm5 configuration problems:

Warning 1 on item /dev/rdsk/c0t0d0: '/dev/rdsk/c0t0d0' backing

device does not exist.

These problems may prevent HPVM guest goldvm5 from starting.

hpvmstart: Unable to continue.

You can do an “ioscan” to identify the new path to the DVD and execute an “hpvmmodify”

command such as the following to rectify the situation (assuming /dev/rdsk/c2t0d0 is the

new path to the USB DVD):

hpvmmodify –P goldvm5 –m dvd:scsi:0,0,1:disk:/dev/rdsk/c2t0d0

This situation occurs because the new USB driver uses different hardware paths and device

special files than the old driver did.