> This is one of those "oh I never knew that but wish I
> did topics" so I
> figured I would make it into a thread and then see
> what we can learn from
> each other.
Check this out:
System Administration Commands cfgadm_scsi(1M)
NAME
cfgadm_scsi - SCSI hardware specific commands for cfgadm
...
DESCRIPTION
The SCSI hardware specific library /usr/lib/cfgadm/scsi.so.1
provides the functionality for SCSI hot-plugging through the
cfgadm(1M) command.
...
The receptacle and occupant state for
attachment points at the SCSI controller have the following
meanings:
...
disconnected
bus quiesced (I/O activity on bus is suspended)
connected
bus active
...
The corresponding states for individual SCSI devices are:
...
disconnected
bus to which the device is attached is quiesced
connected
bus to which device is attached is active
...
OPTIONS
cfgadm defines several types of operations besides listing
(-l).These operations include testing, (-t), invoking confi-
guration state changes, (-c), invoking hardware specific
functions (-x), and obtaining configuration administration
help messages (-h).
SunOS 5.10 Last change: 21 Sept 2005 3
System Administration Commands cfgadm_scsi(1M)
-c function The following generic commands are
defined for the SCSI hardware
specific library:
For SCSI controller attachment
points, the following configuration
state change operations are sup-
ported:
connect Unquiesce the SCSI
bus.
disconnect Quiesce the bus
(suspend I/O
activity on bus).
Incorrect use of
this command can
cause the system to
hang. See NOTES.
...
NOTES
The disconnect (quiesce) operation is not supported on con-
trollers which control disks containing critical partitions
SunOS 5.10 Last change: 21 Sept 2005 8
System Administration Commands cfgadm_scsi(1M)
such as root (/), /usr, swap, or /var. The disconnect opera-
tion should not be attempted on such controllers. Incorrect
usage can result in a system hang and require a reboot.
Hotplugging operations are not supported by all SCSI con-
trollers.
WARNINGS
The connectors on some SCSI devices do not conform to SCSI
hotplug specifications. Performing hotplug operations on
such devices can cause damage to the hardware on the SCSI
bus. Refer to your hardware manual for additional informa-
tion.
SunOS 5.10 Last change: 21 Sept 2005 9
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