Explanation:
Online Spare memory - Designates a populated channel as the spare HP SmartMemory - Reliably identifies and vierifies if loaded memory is genuine HP Double-Chip Sparing -Protect a system's memory from double-bit faults Mirrored Memory - Provides full protection against single-bit and multi-bit errors Lockstep Memory - Two channel operation as a single channel
http://h18004.www1.hp.com/products/servers/technology/memoryprotection.html
Online Spare Memory mode protects against single-bit errors, but Mirrored Memory mode
provides full protection against single-bit and multi-bit errors
http://h18000.www1.hp.com/products/quickspecs/14225_div/14225_div.html
HP SmartMemory verifies that your memory has been tested and performance tuned specifically
on HP ProLiant servers. Most third-party memory vendors simply don't do this or aren't capable of
platform-level testing. HP SmartMemory also ensures you are getting genuine HP Qualified
Memory.
http://h30507.www3.hp.com/t5/Eye-on-Blades-Blog-Trends-in/Information-on-DDR3-memory-lock-
step-technology/ba-p/47527
http://h40089.www4.hp.com/integrity/pdf/4AA0-7545EEE.pdf
Double-chip-sparing technology is a unique firmware function that can permanently detect/correct
an error in a DRAM by recognising failure and then "erasing"
DRAM bits from the Error Correcting Code (ECC) calculations. It also allows the ECC logic to
correct for a second DRAM failure in the same ECC codeword.
This reduces the likelihood of a memory-induced crash compared to single-chip-sparing and is
more cost effective than memory mirroring on x86 servers. Besides a cost benefit, this virtually
eliminates downtime needed to replace failed DIMMs.
In addition, a proactive memory scrubber scrubs soft memory errors. This ensures no measurable
impact on performance as transient errors are corrected before they cause problems. The HP proactive memory scrubber is a hardware solution. This means that, unlike similar software-based approaches, the solution cannot be disabled by applications that preempt the system (such as Oracle@).
