What memory protection is available to a BL460c Gen8?

Question

Options

• ALockstep
• BNon-Lockstep
• CAdvanced ECC (multi-bit error protection)
• DMemory Mirroring Mode
• EMemory Online Spare Mode

• A
  83% (34)
• B
  7% (3)
• D
  10% (4)

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 - The BL460c Gen8 supports only 3 memory modes - Just to be clear that there is a difference between Lockstep and Mirroring - Page 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.

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