What memory protection is available to a BL460c Gen8?

A.
Lockstep

B.
Non-Lockstep

C.
Advanced ECC (multi-bit error protection)

D.
Memory Mirroring Mode

E.
Memory Online Spare Mode

Explanation:

If this
QUESTION references the BL460c Gen8 BUT still asks for 4 answers then HP has
been very slack (as usual) at updating the question…
The BL460c G7 supports 4 memory modes –
http://h18004.www1.hp.com/products/quickspecs/13706_div/13706_div.PDF

HOWEVER
The BL460c Gen8 supports only 3 memory modes –
http://h18004.www1.hp.com/products/quickspecs/14208_div/14208_div.PDF

Just to be clear that there is a difference between Lockstep and Mirroring -http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00256987/c00256987.pdf – Page 11
Mirrored Memory mode
Mirrored Memory mode is a fault-tolerant memory option that gives you a higher level of security
than Online Spare mode. Mirrored Memory mode provides full protection against single-bit and
multi-bit errors.
With Mirrored Memory mode, the memory subsystem writes identical data to two channels
simultaneously. If a memory read from one of the channel returns incorrect data due to an
uncorrectable memory error, the system automatically retrieves the data from the other channel. A
transient or soft error in one channel does not affect mirroring, and operation continues unless
there is a simultaneous error in exactly the same location on a DIMM and its mirrored DIMM.
Mirrored Memory mode reduces the amount of memory available to the operating system by 50%
since only one of the two populated channels provides data.
Lockstep Memory mode
Lockstep Memory mode uses two memory channels at a time and offers you an even higher level
of protection. In lockstep mode, two channels operate as a single channel—each write and read
operation moves a data word two channels wide. Both channels split the cache line to provide 2x
8-bit error detection and 8-bit error correction within a single DRAM. In three-channel memory
systems, the third channel is unused and left unpopulated. The Lockstep Memory mode is the
most reliable, but it reduces the total system memory capacity by one-third in most systems.