Sun Microsystems Sun Fire X4200 User Manual
Page 130
10-2
Sun Fire X4100 and Sun Fire X4200 Servers System Management Guide • December 2005
■
In all cases, the CD drive and floppy drive appear to be plugged in to the host.
■
The host finds out about a medium change and medium insertion or removal by
sending SCSI commands, which are handled by the USB driver. The USB driver
returns "no medium" immediately if Remote Console software (specific device
redirection) is not connected.
■
If Remote Console software is connected, the host driver passes on the command
to the remote client, and the remote client will return that actual status based on
whether a medium is actually present or whether a medium has changed since
the host last asked about it.
■
For USB devices, there is no asynchronous way for a device to communicate
status changes to the host, so the host always queries. For both CDs and floppies,
a "test unit ready" command is periodically sent by the host.
Information in
describes different case scenarios in which the Remote
Console software and CD drive and floppy drive redirection operate.
TABLE 10-1
Remote Console Operation With DVD Drive and Floppy Drive
Case
Status
DVD As Seen by Host
Floppy As Seen by Host
1
Remote Console not started, or
Remote Console started but
DVD/floppy redirection not
started.
DVD device present. No
medium indication is sent to the
host from the SP whenever the
hosts asks.
Floppy device present. No
medium indication is sent to the
host from the SP whenever the
host asks.
2
Remote Console started with no
medium present in the drive.
DVD device present. Whenever
the host asks, which may be
automatic or when you access
the device on the host, the
remote client sends a status
message. In this case since there
is no medium, the status is no
medium.
Floppy device present.
Whenever the host asks (for
example, you double-click on a
drive), the remote client sends a
status message. In this case
since there is no medium, the
status is no medium.
3
Remote Console started with no
medium, then medium is
inserted.
DVD device present. Whenever
the hosts asks (automatic or
manual), the remote client sends
a status message as medium
present and also indicates the
medium change.
Floppy device present.
Whenever the host asks
(manual), the remote client
sends a status message as
medium present and also
indicates the medium change.
4
Remote Console started with
medium inserted.
Same as 3.
Same as 3.
5
Remote Console started with
medium present, then medium
is removed.
Next command from the host
will get a status message
indicating medium not present.
Next command from the host
will get a status message
indicating medium not present.
6
Remote Console started with
image redirection.
Same as 3.
Same as 3.