When To Reconfigure; Disk Devices - Sun Microsystems Sun Enterprise 10000 Dynamic Reconfiguration User Manual

The DR user interface enables you reconfigure the domain after a DR Attach or DR
Detach operation. The reconfiguration sequence is the same as the reconfiguration
boot sequence (boot -r):
drvconfig; devlinks; disks; ports; tapes;
When you execute the reconfiguration sequence after you attach a board, device
path names not previously seen by the domain are written to the
/etc/path_to_inst file. The same path names are also added to the /devices
hierarchy, and links to them are created in the /dev directory.

When to Reconfigure

You should reconfigure the domain if any of the following conditions occur:
Board Addition – When you add a board to a domain, you must execute the
reconfiguration sequence to configure the I/O devices that are associated with the
board.
Board Deletion – If you remove a board that is not to be replaced, you may, but do
not have to, execute the reconfiguration sequence to clean up the /dev links.
Board Replacement – If you remove a board then reinsert it in a different slot or if
you replace a board with another board that has different I/O devices, you must
execute the reconfiguration sequence to configure the I/O devices that are
associated with the board. However, if you replace a board with another board
that hosts the same set of I/O devices, inserting the replacement into the same slot,
you do not need to execute the reconfiguration sequence. But, be sure to insert a
replacement board into the same slot that was vacated to retain the original
mapping of /dev links to physical names.

Disk Devices

Disk controllers are numbered consecutively as the disks(1M) program encounters
them. All disk partitions are assigned /dev names according to the disk controller
number that disks(1M) assigns. For example, all disk partitions that are accessible
using disk controller 1 are named /dev/dsk/cXtYdZsW
where:
X is the disk controller number,
Y, in most cases, corresponds to the disk target number,
Z corresponds to the logical unit number, and
8 Sun Enterprise 10000 Dynamic Reconfiguration User Guide • February 2000