Fujitsu Siemens Computers SPARC Enterprise M8000 - Manual (Page 60)

2-28 SPARC Enterprise Mx000 Servers Dynamic Reconfiguration User’s Guide • September 2007
memory contents. Be aware that some of the total swap space may be supplied by
disks that are attached to the board to be deleted. When making your assessment, be
certain to also account for the swap space that will be lost.
■ If the size of available memory (e.g., 1.5 gigabytes) is larger than the size of
deleted memory (e.g., 1 gigabytes), the total size of available memory will be 0.5
gigabytes after deleting the system board.
■ If the size of available memory (e.g., 1.5 gigabytes) is smaller than the size of
deleted memory (2 gigabytes), the attempt to delete the system board will fail.
To determine the size of currently available swap area, execute the swap -s
command on the OS and verify that the memory size is marked available. For details,
refer to the Solaris man page swap(1M). Moreover, the size of physical memory of
system board to be deleted and information on I/O devices connected can be
confirmed by the showdevices(8) command. See Section 3.1.4, “Display Device
Information” in
Chapter 3 , DR User Interface, or the showdevices(8) man page.
Refer to Appendix B for a more complete example.
2.5.3 Real-time Processes
The Solaris OS is temporarily suspended when a kernel memory board is deleted or
moved. If your system has any real-time requirements (such as might be indicated
by the presence of real-time processes), be aware that such a DR operation could
significantly affect these processes.
2.5.4 Memory Mirror Mode
The memory mirror mode is a function used to duplex memory to ensure the
hardware reliability of memory. When memory mirror mode is enabled, the domain
can continue operation even if a fault occurs in a part of memory (provided that the
fault is recoverable).
Memory mirror mode cannot be set in some division types of PSB. Please see the
SPARC Enterprise M4000/M5000/M8000/M9000 Servers XSCF User’s Guide for the
availability of memory mirroring.
Enabling memory mirror mode does not restrict any DR functions. However, you
must consider the domain configuration and operation when enabling memory
mirror mode.