HP DL740 - ProLiant - 4 GB RAM Manual
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HP DL740 - ProLiant - 4 GB RAM Manual

HP DL740 - ProLiant - 4 GB RAM Manual

Hot plug raid memory technology for fault tolerance and scalability
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technology brief
TC030412TB

table of contents

hp industry
standard servers
hot plug RAID memory technology for fault tolerance and
scalability
abstract .................................................................................................................... 2
introduction .............................................................................................................. 2
memory reliability..................................................................................................... 2
error detection and correction ................................................................................... 3
parity checking.................................................................................................................. 3
error checking and correcting ............................................................................................ 3
potential for system failures ............................................................................................... 3
hot plug RAID memory.............................................................................................. 4
performance...................................................................................................................... 5
basic operation ................................................................................................................. 6
hot-plug capabilities .......................................................................................................... 8
ease-of-use capabilities ..................................................................................................... 9
conclusion ................................................................................................................ 9
feedback .................................................................................................................. 9
april 2003
1

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Summary of Contents for HP DL740 - ProLiant - 4 GB RAM

  • Page 1: Table Of Contents

    hp industry april 2003 standard servers hot plug RAID memory technology for fault tolerance and scalability technology brief TC030412TB table of contents abstract ........................2 introduction ......................2 memory reliability..................... 2 error detection and correction ................... 3 parity checking........................3 error checking and correcting ....................

  • Page 2: Abstract

    hot plug RAID memory technology for fault tolerance and scalability abstract This technology brief describes the Hot Plug RAID Memory technology developed by HP to give enterprise-class servers the level of memory fault tolerance today’s 7x24 applications demand. It provides background information on memory reliability, reviews current error detection and correction techniques, and explains why the likelihood of memory errors grows as memory capacity increases.

  • Page 3: Error Detection And Correction

    hot plug RAID memory technology for fault tolerance and scalability Two kinds of errors can typically occur in a memory system. The first is called a hard, error and is characterized by the fact that it is repeatable, though it may be very inconsistent.

  • Page 4: Hot Plug Raid Memory

    hot plug RAID memory technology for fault tolerance and scalability figure 1: server outages during a one-year period due to memory failures Parity 1000000 ECC for large memory systems is only about as 100000 120% good as parity checking is for smaller capacities 10000 1000 4.6%...

  • Page 5: Performance

    hot plug RAID memory technology for fault tolerance and scalability ProLiant servers with Hot Plug RAID Memory technology use five memory controllers to control five cartridges of industry-standard synchronous DRAM (SDRAM). When a memory controller needs to write data to memory, it splits a cache line of data into four blocks (shown as A, B, C, and D in figure 2).

  • Page 6: Basic Operation

    hot plug RAID memory technology for fault tolerance and scalability basic operation The operation of Hot Plug RAID Memory is dependant on the operation of processors, which use cache lines of data. A cache line of data is formed using data words from a group of DIMMs.
  • Page 7 hot plug RAID memory technology for fault tolerance and scalability figure 5: diagram of a memory read transaction for one of the four data paths Good SDRAM ECC Logic Data Miscompare Parity SDRAM ECC Logic Compare = NMI, if ECC did not report it SDRAM ECC Logic...

  • Page 8: Hot-Plug Capabilities

    hot plug RAID memory technology for fault tolerance and scalability If the signal from the ECC logic to the MUX indicates that the data is good, a parity compare logic circuit (for example, PC1, PC2, PC3, or PC4 in figure 6) compares the data from the ECC logic with the regenerated data from the RAID memory logic.

  • Page 9: Ease-Of-Use Capabilities

    Please direct comments regarding this communication to the ISS Technology feedback Communications Group at this Internet address: TechCom@HP.com The information in this document is subject to change without notice. © Copyright 2001, 2003 Hewlett-Packard Development Company, L.P. 04/2003 Document Number TC030412TB...

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