Detaching A System Board; Drain - Sun Microsystems Sun Enterprise 10000 Dynamic Reconfiguration User Manual

6. Type exit to terminate this dr(1M) session.
dr> exit
%
The SSP login shell prompt is again displayed.

Detaching a System Board

This section gives a broad overview of the actions that occur when you execute DR
Detach. For step-by-step instructions, see "To Detach a Board With Hostview" on
page 32.
System boards that are currently being used by the operating environment can be
detached if they meet the requirements covered in "Configuration for DR Detach"
on page 4. After you select an eligible board, you can detach that board by
performing two operations: Drain and Complete Detach.

Drain

The primary function of the Drain operation is to determine how the board's
memory is to be vacated by the operating environment and, if required, to select a
target memory area for copying the nonpageable memory on a board. If a suitable
target memory area is not available when the drain operation is requested, the
request is denied. If the drain is rejected for this reason, you can continue to retry
until target memory is available. See "Configuration for DR Detach" on page 4.
After the Drain operation is started, the pageable memory on the board is flushed to
a disk, which removes it from use by the domain. Whenever a page of memory
becomes free, that page is locked from further use. The drain has no noticeable
impact on the processes using the CPU and I/O resources on the board. However,
less memory is available to the domain.
Note – After memory is drained, enough memory and swap space must remain in
the domain to accommodate the current workloads.
26 Sun Enterprise 10000 Dynamic Reconfiguration User Guide • February 2000