IBM AS/400e, Руководство пользователя

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AS/400e server 820
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AS/400e server 820
For the #2396 and #2425 processors:
• There are eight slots available in the base system for main storage DIMMs, which plug
directly onto the processor (Direct Attach).
• If more than eight DIMMs total are required, a #2884 Main Storage Expansion Card
must be ordered and all DIMMs must then reside on the #2884. Without the #2884, the
DIMMS must be paired. With the #2884, the DIMMs must be in sets of four (quads) of
the same capacity and technology. There is an exception that allows a single set of
two main storage DIMMs on a #2884, if these are the only two on the system. If any
additional DIMMs are added above the initial two, the initial two must be paired up to
make a quad, and then only DIMM quads can subsequently be added.
For the #2397, #2398, #2426 and #2427 processors:
• A Base Main Storage Expansion Card (CCIN 2884) is included in the base system and
does not need to be ordered
• Main storage DIMMs must be plugged onto the Base Main Storage Expansion Card
(CCIN 2884) and must be added in sets of four (quads) of the same capacity and
technology. There is an exception that allows a single set of two main storage DIMMs
if these are the only two on the system. If any additional DIMMs are added above the
initial two, the initial two must be paired up to make a quad, and then only DIMM quads
can subsequently be added.
• #2884 is required when the number of DIMMs exceeds 16.
#2884 Main Storage Expansion Card
• This feature provides for mounting DIMM memory on the Model 820. It contains one
riser card with 16 sockets for placement of 128 MB, 256 MB, or 512 MB DIMMs.
• Maximum: One (not supported on Processor #2395).
• For placement, an initial pair of memory DIMMs is allowed (in slot A and slot B) without
quads. After that, all DIMMs must be plugged in quads starting from the outer four
corners going toward the center (A, B, C, D, then E, F, G, H, etc). Using same feature
code number within a quad is required. Mixing of quad “groups” on the same riser card
is also allowed.
• For processors #2397, #2398, #2426, and #2427, a #5157 Feature Power Supply
must be present or ordered when a feature #2884 Main Storage Expansion is added or
ordered.
Power and Packaging
The Model 820 does not include an internal battery. An external UPS is recommended to
protect the system unit and any external components against utility power outages. The