HP DL380z Gen8 Virtual Workstation - Manual (Page 49)

Table 5-1 Maximum capacity (continued)
DIMM type DIMM rank One processor Two processors
LRDIMM Quad-rank 384 GB 768 GB
UDIMM Single-rank 32 GB 64 GB
UDIMM Dual-rank 64 GB 128 GB
HDIMM Dual-rank 192 GB 384 GB
For the latest memory configuration information, see the QuickSpecs on the HP website
( http://www.hp.com ).
Advanced ECC memory configuration
Advanced ECC memory is the default memory protection mode for this server. Standard ECC can
correct single-bit memory errors and detect multi-bit memory errors. When multi-bit errors are
detected using Standard ECC, the error is signaled to the server and causes the server to halt.
Advanced ECC protects the server against some multi-bit memory errors. Advanced ECC can correct
both single-bit memory errors and 4-bit memory errors if all failed bits are on the same DRAM device
on the DIMM.
Advanced ECC provides additional protection over Standard ECC because it is possible to correct
certain memory errors that would otherwise be uncorrected and result in a server failure. Using HP
Advanced Memory Error Detection technology, the server provides notification when a DIMM is
degrading and has a higher probability of uncorrectable memory error.
Online Spare memory configuration
Online spare memory provides protection against degraded DIMMs by reducing the likelihood of
uncorrected memory errors. This protection is available without any operating system support.
Online spare memory protection dedicates one rank of each memory channel for use as spare
memory. The remaining ranks are available for OS and application use. If correctable memory errors
occur at a rate higher than a specific threshold on any of the non-spare ranks, the server
automatically copies the memory contents of the degraded rank to the online spare rank. The server
then deactivates the failing rank and automatically switches over to the online spare rank.
Lockstep memory configuration
Lockstep mode provides protection against multi-bit memory errors that occur on the same DRAM
device. Lockstep mode can correct any single DRAM device failure on x4 and x8 DIMM types. The
DIMMs in each channel must have identical HP part numbers.
Memory options 43