Memory Mirroring; Online-Spare Memory; Ibm Director - IBM xSeries 236 User Manual

v Wake on LAN

Memory mirroring

Memory mirroring stores data in two pairs of DIMMs simultaneously. To support
memory mirroring, you must install identical dual inline memory modules (DIMMs) in
all DIMM slots. For more information, see the section about installing memory
modules in the Option Installation Guide on the IBM xSeries Documentation CD.
To enable memory mirroring through the Configuration/Setup Utility program, select
Advanced Setup from the main menu, and select Memory Configuration. For
more information about using the Configuration/Setup Utility program, see
Chapter 2, "Configuring the server," on page 17.

Online-spare memory

Online-spare memory disables a failed DIMM pair from the system configuration
and activates an online-spare memory DIMM pair to replace the failed pair. Before
you can enable this feature, you must install one additional pair of DIMMs. The
online-spare memory DIMM pair must be the same speed and type, and the same
size as the active DIMM pair or larger.
Enable online-spare memory through the Configuration/Setup Utility program. The
BIOS assigns the online-spare memory DIMM pair according to your DIMM
configuration. See "Using the Configuration/Setup Utility program" on page 17 for
further details about enabling online-spare memory. See Table 3 for the online-spare
memory DIMM connector assignments.

IBM Director

With IBM Director, a network administrator can:
v View the hardware configuration of remote systems, in detail
v Monitor the usage and performance of critical components, such as
®
capability
Table 2. Memory mirroring DIMM installation sequence
Bank DIMM pairs
1 7 and 8
2 5 and 6
3 3 and 4
4 1 and 2
Table 3. Online-spare memory DIMM connector assignments
Active DIMM connectors
1 and 2
1 and 2
3 and 4
1 and 2
3 and 4
5 and 6
microprocessors, disks, and memory
Online-spare memory DIMM connectors
3 and 4
5 and 6
7 and 8
Chapter 1. Introducing the IBM xSeries 236 Type 8841 server
7