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Superdome Configuration
Upgrades and Add-ons
SuperDome Configuration
Adding additional capacity to an existing system requires careful consideration and planning. A Solution Implementation
Plan (SIP) should be developed before visiting the customer site.
A Solution Manager assigned by HP's Global Sales Services (GSS) working with the account owner, will identify the
system configurations, services, and training required to meet the customer's needs.
The physical configuration and site preparation will be handled by Global Deployment Services (GDS), managed by their
Deployment Manager, working with ESSO to complete the physical installation.
Configuration Guidelines
To achieve the best performance and high availability consider the following factors as shown in order of importance:
Memory Population
1.
Cell Population
2.
Partition Size
3.
I/O Chassis Allocation
4.
Memory Population
Each cell has two memory busses that must be evenly populated to achieve full bandwidth and reduce latency.
Configurations of 4 Gbytes, 8 Gbytes, 12 Gbytes, and 16 Gbytes per cell accomplish this.
Memory must be symmetric within each partition for interleaving to be even across all the cells, otherwise performance
problems can result. Consider the following example:
Example 1 Incorrect Memory Distribution Across Partitions
If a two cell partition has 2 Gbytes of memory on one cell and 16 Gbytes on another, 4 Gbytes will be interleaved
(two from each cell) and 14 Gbytes will be assigned to one cell only. This will result in inconsistent bandwidth and
latency problems.
Cell Population
A group of four cells (a quad) resides on one Crossbar Chip (XBC) and has the lowest latency. Quads are slots 0-3, 4-7,
8-11 and 12-15.
Keep partitions with a size less than or equal to four on the same quad.
Memory traffic from one quad to another is routed in pairs. The following pairs share the same path: 0 and 1, 2 and 3, 4
and 5, and 6 and 7.
The SD3200 can have dual links between quads if U-turns are installed on the backplane. To use both links a six-cell
partition uses slots 0-3, 5, and 7 as would 4 and 6.
Partitions that share links share common points of failure.
XBC-XBC links can saturate and kill performance. An eight-cell partition on an SD6400 should be spread across
cabinets. Cab 0, slots 0-3, 5, 7 and Cab 1, slots 4 and 6.
Partition Size
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