HP ProLiant DL580 G3 Server - Manual (Page 102)

102 HP ProLiant DL580 Generation 3 Server User Guide
• For hot-replace to function properly, the memory board must be re-inserted
into the location from which it was removed. If the board is placed into the
incorrect slot (for example, if board 2 is removed in dual-board mode and re-
inserted into memory slots 3 or 4), a configuration error occurs. Attempting
to insert a board into the improper position results in audio alarms and visual
alerts.
• Replace only one board at a time. That is, if memory boards 2 and 4 both
contain memory errors, remove board 2, correct the error, and replace board
2. Wait for the board status LED to stop flashing before proceeding to board
4.
• If a board is inserted into a valid memory slot but with an invalid DIMM
configuration (including too much or too little memory), a DIMM
configuration error occurs and a visual alert occurs (refer to Memory Board
Components and LEDs (on page
12 )).
• If you remove a board while the server is running and do not replace the
board, the server defaults to Advanced ECC ("Advanced ECC memory" on
page
97 ) on the next reboot.
Hot-plug RAID memory
Hot-plug RAID memory provides a similar level of memory protection as hot-
plug mirrored memory (on page
100 ) but obtains this protection using less total
memory. Hot-plug RAID memory protects the server against uncorrectable
memory errors that would otherwise result in a server failure.
Although hot-plug mirrored memory keeps two copies of all memory data, hot-
plug RAID memory keeps only one copy of all memory data and additional
parity information. If an uncorrectable memory error is encountered, the server
can create the proper data using the parity information and the information from
the other memory boards that contain no failures. In a hot-plug RAID memory
configuration, 25% of the installed memory is not available to the operating
system. In a hot-plug mirrored memory configuration, however, 50% of the
installed memory is not available to the operating system.