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Product Facts ⏐ Issue: June 01, 2008 ⏐ Product: SPARC
®
Enterprise M5000 Page 26 / 38
Notes on Memory ordering:
• Two sets of memory modules with the same size (16 DIMMs) must be mounted on a physical system board as a
minimum. 8 DIMMS are always handled as one set.
• When adding memory, two sets of memory modules with the same size must be added at the same time. Memory can
only be added in increments of 2x eight DIMMs. Only 2, 4, 6 or 8 Memory Modules are allowed.
• For mixing DIMMs with different sizes special conditions have to be noticed, see chapter ”
Mounting additional
Memory with different sizes
”.
• If Memory Modules are installed on the second physical System Board a CPU-module on this PSB is mandatory and vice
versa.
• If a second internal I/O-tray is installed, at least one CPU-module and two Memory modules on the second physical
System Board are mandatory (see also Memory Exception rules).
• Min of 1 memory module per processor in Quad XSB Mode
Hint: When ordering 4Gb DIMMs the customer has to specify how FSC shall deal with the memory which comes with the base
configuration. It can either be delivered in a separate package or placed in MEM slots which remain open.
Memory Exception rules requires a “Request for Project Release”:
• To keep the initial costs low it is allowed as an exception to run a physical system board with only one MEM-module.
This is allowed for PSB#0 or PSB#1 or both of them. This is meaningful in cases where a basic server configuration with
only two MEM modules is ordered together with an additional 2
nd
I/O-tray. To get the 2
nd
I/O tray working you have to
move a CPU module and a MEM module from the first PSB to the second PSB.
• PSBs with only one MEM module can only be configured in Uni-XSB mode, but not in Quad-XSB mode.
• If you run a PSB with only one MEM module you have to be aware of the risk in case:
- Of uncorrectable memory errors. In such a case the partition will panic and will not be bootable again,
until the memory fault is solved.
- If reconfigured to quad-XSB the CPU module, which is placed in a XSB without memory, will be
disabled.
Memory Mirroring
SPARC
®
ENTERPRISE M5000 models provide hardware based memory mirroring to avert system downs even when multi-bit
errors are detected.
Features:
• Memory mirroring is available in both Uni-XSB and Quad-XSB configurations. In Quad-XSB configuration, however,
mirroring should be configured in units of four XSBs (the same size as with Uni-XSB configuration). Mirroring cannot be
configured using a single XSB.
• Mixed configurations of mirrored and unmirrored SB/XSB in one partition are supported (on M5000).
• Memory mirroring configuration is performed from the XSCF. For more information, refer to “eXtended System Control
Facility User’s Guide”.
• When mirroring is configured, the available memory capacity on each SB/XSB one-half of the total size.
• Mirroring is done within a group using combinations as shown below. Thus, the memory size in Groups A and B can be
different.