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# Board metrics

Core components of the storage system include two back-end director boards, two memory boards, and two front-end boards.

Within the PM metrics section, V4 is used to denote that the metric is supported only by a storage system (array) running PowerMaxOS 10 (6079). V3 is used to denote that the metric is supported only by a storage system (array) running HYPERMAX OS 5977 or PowerMaxOS 5978. Metrics without the denotation are supported by all storage systems (arrays).

The following table lists all metrics that are available for boards.

The measurements reflect the transfer rate to and from BOSCO compared with the maximum bandwidth.

Utilization, in addition to inbound and outbound speed, are measured across all processors, regardless of type.

Table 1. Board metrics
Metric | Description
--- | ---
Inbound Throughput | Inbound throughput
Max Speed | Maximum speed
Outbound Throughput | Outbound throughput
Utilization | Utilization - calculated value: ((transfer-rate-in + transfer-rate-out)/max-transfer-rate)

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