FACTOID # 60: Japan's water has a very high dissolved oxygen concentration - but not enough to prevent drowning in the bath.
 
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Encyclopedia > Memory scrubbing

Memory scrubbing is a process in which a memory controller reads memory during idle periods and corrects single bit errors and writes the content back to the memory to prevent single bit errors adding up into non-correctable multiple bit errors.


  Results from FactBites:
 
IBM Redbooks | Active Memory (914 words)
Memory scrubbing is an automatic daily test of all the system memory that detects and reports memory errors that might be developing before they cause a server outage.
Memory mirroring is roughly equivalent to RAID-1 in disk arrays, in that memory is divided in two ports and one port is mirrored to the other half.
Memory mirroring must be disabled when using hot-add and due to the way memory is implemented in the x445, the port you are adding memory to must be empty before you add memory, and DIMMs must be added in multiples of two.
POWER2 Fixed-Point, Data Cache, and Storage Control Units -- Page 3 (4040 words)
Memory data is loaded one word per cache macro per cycle in a four-word memory system, and two words per cache macro per cycle in an eight-word system.
Memory addresses are moved from the PBUS into the PBUS Memory Queue and then moved out to main memory via the memory row/column address generation logic.
The scrub sequence consists of three memory transfers: a read operation to detect errors, a write operation to correct the errors, and a read operation to verify that the data has been corrected.
  More results at FactBites »


 

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