Asus DSEB-DG SAS User Guide - Page 39

Memory Sparing : At configuration time, a DIMM rank is set aside to replace a defective DIMM rank. When the error rate for a failing DIMM rank reaches a pre-determined threshold, the memory sparing function will issue an interrupt and initiate a spare copy. At the completion of the copy, the failing DIMM rank is disabled and the "spared" DIMM rank will be used in its place. Refer to 4.4.2 Chipset Configuration and configure the options of Branch Specific Sparing to enable the memory sparing functions. And the default BIOS setting is disabled. • Each branch contains its own sparing engine and can be enabled or disabled separately. • This motherboard does not support rank sparing across branches. • This motherboard does not support rank sparing when in mirror mode. • The DIMM rank with the largest size will be assigned as spare rank. Data can only be copied from a smaller sized rank to a larger sized one. • A DIMM can contain only one or two ranks. To support sparing function, a DIMM channel should contain at least two ranks. • When sparing function is enabled, the usable memory size will reduce then size of the spare ranks. The following tables show memory configurrations with Memory Sparing function in Branch 0. One DIMM per channel (two ranks) Branch0 Sparing Memory space Total Memory Channel 0 DIMM_00 (1024MB*2 Ranks) Rank 0 Rank 1 (1024 MB) (1024 MB) Channel 1 DIMM_10 (1024MB*2 Ranks) Rank 0 Rank 1 (1024 MB) (1024 MB) 1024 MB 1024 MB 2048 MB ASUS DSEB-DG Series 2-19