IBM RS/6000 SP, Handbook

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RS/6000 SP and Clustered IBM
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pSeries Systems Handbook
򐂰 Each SP-attached server and Clustered Enterprise Server occupies one
frame number.
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If using PSSP Version 3.1.1 or before, the SP-attached server cannot be the
first frame. It also cannot be inserted between a switched frame and any
non-switched expansion frame using that switch.
Slot numbering
A Tall frame contains eight drawers and each drawer has two slots; there are 16
slots, in total. A Short frame has only four drawers; eight slots, in total, are
available. A slot number describes the slot position of a node in an SP system.
This is sensed by the software and can be viewed through software tools. When
viewing a frame from the front, the slots are numbered sequentially from bottom
left to top right.
For slot numbering, the following rules are applied:
򐂰 A thin node occupies a single slot in a drawer and its slot number is the
corresponding slot.
򐂰 A wide node occupies two slots and its slots number is the odd-numbered
slot.
򐂰
A high node occupies four consecutive slots in a frame. Its slots number is the
first (lowest number) of these slots.
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An SP-attached server and a Clustered Enterprise Server is the only node in
its frame. Its slot number is always 1, but uses the full 16 slot numbers.
Therefore, 16 is added to the node number of the SP-attached server or
Clustered Enterprise Server to get the node number of the next node.
Other special slot numbers are:
򐂰 Slot number zero (0) is used for the frame supervisor card.
򐂰 Slot number 17 is used for the SP Switch board supervisor card.
Node numbering
A node number is a global ID assigned to a node and it is automatically
generated in the SP/CES system. Each node in the system, are assigned a node
number, regardless of node or frame type, by the following formula (where
slot_number is the lowest slot number occupied by the node):
node_number =((frame_number - 1) x 16) + slot_number