HP ProLiant DL580 G3 Server - Manual (Page 98)

98 HP ProLiant DL580 Generation 3 Server User Guide
Advanced ECC provides additional protection over Standard ECC in that it is
possible to correct certain memory errors that would otherwise be uncorrectable
and result in a server failure. Whereas Standard ECC can correct single-bit
memory errors, Advanced ECC can correct single-bit memory errors and multi-
bit memory errors if all failed bits are on the same DRAM device on the DIMM.
The following guidelines apply to Advanced ECC memory:
• All general memory requirements apply.
• Advanced ECC mode is supported with one to four memory boards.
• Board insertions do not convert the AMP mode while the server is running.
A server cannot be converted from Advanced ECC to another AMP mode by
inserting a board while the server is running. Board insertions in Advanced
ECC are solely for making additional memory resources available to the
operating system.
• Advanced ECC is the only mode in which hot-add operations are supported,
and is the only mode in which the amount of memory available to the
operating system can be increased without a reboot.
• If a memory board (which contains DIMMs) is unlocked while in Advanced
ECC mode, audio alarms and visual alerts occur.
The following rules apply to hot-add operations. Hot-add is performed by adding
a memory board while the server is running, and the additional memory is made
available to the operating system without a reboot.
• Boards must be inserted sequentially.
• Multiple hot-add board insertions can be performed one at a time on the
same server. For example, if a server has three empty memory board slots,
three hot-add board insertions can be performed.
• If multiple hot-add operations are performed, allow one board insertion
operation to complete (as indicated by the memory board LEDs ("Memory
board components and LEDs" on page
12 ) and operating system logs) before
inserting another memory board.
CAUTION: When the memory board locking switch is unlocked in
a mode that does not support hot-add or hot-replace capabilities, audio
alarms and visual alerts occur. Removing the memory board at this
point causes server failure.