Advanced Ecc Memory Population Guidelines; Online Spare Memory Population Guidelines - HP ProLiant DL980 G7 Maintenance And Service Manual

protection. For more information, see "Online Spare memory population guidelines
Spare memory population guidelines" (page
Mirrored Memory mode provides the maximum protection against failed DIMMs. Uncorrectable
errors in the DIMMs of one memory cartridge are corrected by the DIMMs in the mirrored
cartridge. The two memory controllers of each processor form a mirrored pair using two
memory cartridges. For more information, see "Mirrored Memory population guidelines
("Mirrored Memory population guidelines" (page
AMP modes are configured in RBSU. If the requested AMP mode is not supported by the installed
DIMM configuration, the server boots in Advanced ECC mode. For more information, see "HP
ROM-Based Setup Utility."
For the latest memory configuration information, see the QuickSpecs on the HP website
www.hp.com/go/ProLiant).

Advanced ECC memory population guidelines

Advanced ECC memory is the default memory protection mode for the server. Up to 2-TB of active
memory using 16-GB DIMMs is supported in this AMP mode.
Advanced ECC can correct single-bit and multi-bit memory errors on a single x8 or two adjacent
x4 DRAM devices.
The server provides notification when correctable error events have exceeded a pre-defined threshold
rate. When uncorrectable errors are detected using Advanced ECC, the server notifies the user
and shuts down the operating system.
NOTE: When attempting to install or boot VMware ESX 4.1 on a ProLiant DL980 G7 server
with Advanced Memory Protection (Memory Mirroring) enabled, the following error message will
be displayed:
The system has found a problem on your machine and cannot continue.The BIOS will report that
NUMA node 1 has no memory. When implementing memory mirroring on the ProLiant DL980 G7
server, the sockets are paired so that the even socket of each pair is considered primary and the
odd socket is the mirror. However, the system reports that the cores on the odd sockets do not have
any local memory.If Memory Mirroring is enabled prior to VMware installation, then immediately
after BIOS POST and when the VMware installation begins, press F2 and add the following line
to the boot options:useNUMAInfo=falseAfter installation, the system will reboot. Perform the
following:
1. At the boot menu, press "a" to modify the kernel argument and add "useNUMAInfo=false"
to the end of the "grub append>" line.
2. Boot to VMware ESX 4.1.
3. Log into the newly installed VMWare Server with vSphere Client or vCenter Client.
4. Navigate to: Configuration Panel -> Software Advanced Settings -> VMKernel
5. Uncheck "VMkernel.Boot.useNUMAInfo" to disable NUMA.
If Memory Mirroring will be enabled after VMware is installed, perform the following:
6. Log into the installed VMWare Server using the vSphere Client or vCenter Client application.
7. Navigate to Configuration Panel -> Software Advanced Settings -> VMKernel.
8. Uncheck "VMkernel.Boot.useNUMAInfo" to disable NUMA prior to enabling memory mirroring.

Online Spare memory population guidelines

Online spare memory provides protection against persistent DRAM failure. It monitors DIMMs for
excessive correctable errors and copies the content of an unhealthy rank to an available spare
rank in advance of multi-bit or persistent single-bit failures that may result in uncorrectable faults.
Rank-sparing is more efficient than DIMM-sparing since only a portion of a DIMM is set aside for
memory protection.
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