HP ProLiant DL580 Generation 3 User 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.