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# RDF Director metrics

Unisphere collects and displays metrics for SRDF directors.

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 SRDF directors.

Table 1. RDF director metrics
Metric | Description
--- | ---
% Busy | The percent of time the director is busy (numerator_delta/denominator_delta) * 100.
% Compressed Throughput Received | The ratio of the amount of data received as compared with the amount of data that would be received without compression (expressed as a percentage) Calculated value: ((Compressed Throughput Received per sec/Throughput Received per sec) * 100)
% Compressed Throughput Sent | The ratio of the amount of data sent as compared with the amount of data that would be sent without compression (expressed as a percentage) Calculated value: ((Compressed Throughput Sent per sec/Throughput Sent per sec) * 100)
% Compressed Throughput Sent and Received | The ratio of the amount of data transferred as compared with the amount of data that would be transferred without compression (expressed as percentage) Calculated value: ((Compressed Throughput Sent and Received per sec/Throughput Sent and Received per sec) * 100)
Async Throughput Sent | The number of async MBs sent per second using this SRDF director
Async Write Reqs/sec | The number of async write requests managed by this SRDF director per second.
Avg IO Service Time | The average time the director takes to serve I/O.
Avg IO Size Received | Calculated value: (MBs received per sec/reads per sec)
Avg IO Size Sent | Calculated value: (MBs sent per sec/writes per sec)
Avg Time per Syscall | Calculated value: (syscall time/syscall count)
Compressed Throughput Received | The number of compressed MBs/sec received by this SRDF director
Compressed Throughput Sent | The number of compressed MBs/sec sent by this SRDF director
Compressed Throughput Sent and Received | The number of compressed MBs sent and received by this SRDF director
Copy IOs/sec | The number of copy I/O operations per second using this SRDF director - copy is a generic SRDF term meaning a full track that comes from background data movement. These copies can be generated by a number of different things, including when the SRDF device is in adaptive copy mode. Adaptive copy is included in this term, but not exclusively. For example, if SRDF is suspended, hosts continue to write to the R1 and then SRDF is resumed, the resulting R1->R2 copy of tracks (due to invalids) is a “copy.”
Copy Throughput | The throughput of copy MBs per second using this SRDF director
IOs/sec | The average I/O count per second for the director
Number of Compressed Links | The number of compressed links used by this SRDF director
Number of Links | The number of links used by this SRDF director
Reqs/sec | The average number of requests performed by the director per second
Sync Throughput Sent | The number of sync MBs sent per second using this SRDF director
Sync Write Reqs/sec | The number of sync write requests managed by this SRDF director per second.
Syscall Count/sec | The total number of calls seen by this director
Syscall RDF Dir Count/sec | The number of calls that are sent using SRDF to a remote system
Syscall Remote Dir Count/sec | The number of calls that are sent from the local director to another director in the same system
Syscall Time/sec | The time to satisfy the calls by this director
Throughput Received | The size of the data received in MBs for the director
Throughput Sent | The size of the host data transfer in MBs for the director
Throughput Sent and Received | The total read and write MBs on the SRDF director per second.
Tracks Received/sec | Tracks received per second
Tracks Sent/sec | Tracks sent per second
Write Reqs/sec | The write requests per second