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System BIOS Intel® Server Board Set SE8500HW4
Revision 1.0
Intel order number D22893-001
72
Redundant Array of Inexpensive Disks (RAID) level 4, where data is striped across three
Memory Boards and parity information is kept on the fourth.
When one board fails, the memory subsystem operates in non-redundant mode. The data from
the remaining three boards is used to reconstruct the data that was on the failed Memory Board.
When the failed Memory Board location is hot-replaced, the BIOS rebuilds the RAID by
reconstructing the data that was on the previously failed Memory Board and writs the data to the
newly installed board. When the re-build is complete, the system is once again in redundant
mode. The BIOS sets the Memory Board RAID LED to indicate that the Memory Board is
operating in the memory RAID mode.
Memory hot upgrade is performed with the following steps:
1. Confirm in the BIOS Setup the RAID Upgrade Gap size, which is the size of memory BIOS
allocates on each Memory Board for RAID memory capacity addition.
2. Hot remove one Memory Board
3. Upgrade the removed board, with up to the gap size set in the BIOS Setup
4. Hot add the higher capacity Memory Board
5. Perform 2-4 with the remaining three Memory Boards.
6. When the last Memory Board has been upgraded, the BIOS sends an ACPI notification of
the new memory size to the operating system.
Supported Memory Board configurations for this mode are:
Memory Board A, B, C and D all of equal size.
Memory Board hot replace is supported in the following way:
Memory Board A, B, C and D are installed and are of equal size. Remove Memory
Board A, B, C, or D and replace with an equal sized Memory Board.
Memory Board hot upgrade is supported in the following way:
Memory Boards A, B, C and D are installed and of equal size. The BIOS Setup has been
configured with a RAID Upgrade Gap size corresponding to the planned size update.
One at a time, remove Memory Board A, B, C, and D and replace with an updated size
(that does not exceed the RAID Update Gap size) of Memory Board.