HP USB Virtual Media Interface Adapter Functionality Information

you concurrently map both devices. Depending on the server configuration of mapped drives, the
interface adapter recognizes that:
• Neither of the media drives are mapped. ("Neither of the media drives are mapped" on page 2)
• A mass storage device is mapped. ("A mass storage device is mapped" on page 2)
• Both of the media drives are mapped. ("Both of the media drives are mapped" on page 2)
If the server does not support USB 2.0 at the BIOS level or in the operating system:
1. Click Main>Commands>Display>Versions>IA>Version to select the interface adapter in the
on-screen display (OSD).
2. Manually disable the USB 2.0 functionality of the interface adapter in the OSD of the Virtual Media
KVM switch. The Disable/Enable button for the USB 2.0 is only accessible through the OSD of the
KVM switch connected to the interface adapter.
3. Set the BIOS level to USB 1.1 mode.
Currently, Red Hat Enterprise Linux 3 and 4 support composite USB function at USB 1.1 full speed only.
Neither of the media drives are mapped
If you do not have either media drive mapped, the HP USB Virtual Media Interface Adapter is a
composite device consisting of a keyboard, a mouse, a CD-ROM drive without media installed (default),
or a mass storage device (if it was the last mapped media device). Therefore, when you map a virtual
CD, the interface adapter indicates that media is present in its drive. When the drive is not mapped, the
interface adapter indicates that media has been removed from its drive. This behavior is not a hot-plug
event, but rather it is similar to a physically mapped CD-ROM drive with or without media present.
A mass storage device is mapped
When you first map the mass storage device (floppy disk, floppy image, or USB removable media
device), the HP USB Virtual Media Interface Adapter triggers a hot-plug event ("Hot-plug events" on page
2) and functions as a composite device with a keyboard, a mouse, and a mass storage device. When the
drive is not mapped, the interface adapter indicates that the media has been removed from its drive. Hot-
plug events are only initiated when the Virtual Media type is changed.
Both of the media drives are mapped
If you map both of the Virtual Media drives simultaneously, the HP USB Virtual Media Interface Adapter
triggers a hot-plug event ("Hot-plug events" on page 2) and functions as a composite device with a
keyboard, a mouse, a CD-ROM drive, and a removable media drive.
You cannot map both types of Virtual Media devices concurrently without disrupting the ability of the HP
ProLiant servers to boot directly from attached USB devices because the current BIOS only supports two
bulk USB devices at one time. If an additional USB device is attached directly to the server at the same
time that the two Virtual Media devices are enumerated, three bulk devices would be connected to the
server simultaneously. Because the ProLiant server BIOS only supports two bulk devices at one time, the
third device would not be recognized.
Hot-plug events
Several circumstances trigger hot-plug events. For a detailed description of different hot-plug events, see
the table in "Server configuration results."
During a hot-plug event, all composite devices, including the keyboard and mouse, disconnect from the
USB bus and then quickly reconnect to the USB bus. Certain operating systems might not function correctly
when the keyboard and mouse are disconnected.