Removal and replacement procedures
69
•
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
94
)).
•
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
64
) 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
67
) 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.
As with hot-plug mirrored memory, hot-plug RAID memory allows failed or
degraded DIMMs to be replaced while the server is running without requiring
server downtime. The memory board with the failed DIMMs can be removed,
failed DIMMs replaced, and the board re-inserted into the server without any
interruption to the operating system.
Hot-plug RAID memory is only supported if all four memory boards are
installed. No operating system support is required.
The following guidelines apply to hot-plug RAID memory:
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Страница 125: ...Server cabling 125 9 Remove the power switch cable assembly To replace the component reverse the removal procedure ...
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