Performance metrics for ports on SAN Volume Controller and Storwize systems

A storage environment can include SAN Volume Controller systems, Storwize V7000 systems, and a Storwize V7000 Unified systems. You can include performance metrics for ports and port errors on these systems in performance reports.

Port data

You can create performance reports that include the following information:

Port Send I/O Rate (ops/s)
The average number of I/O operations per second for operations in which data is sent from a port.A send operation is a read operation that is processed, or a write operation that is initiated by the port.
Port Receive I/O Rate (ops/s)
The average number of I/O operations per second for operations in which the port receives data.A receive operation is a write operation that is processed, or a read operation that is initiated by the port.
Total Port I/O Rate (ops/s)
The average number of send operations and receive operations per second.
Port to Host Send I/O Rate (ops/s)
The average number of IOs per second that are sent by the storage system to the hosts that are accessing its storage. Use this metric to help measure host workload against the storage system.
Port to Host Receive I/O Rate (ops/s)
The average number of IOs per second that are received by the storage system from the hosts that are accessing its storage. Use this metric to help measure host workload against the storage system.
Total Port to Host I/O Rate (ops/s)
The average number of IOs per second that are transmitted between the storage system and the hosts that are accessing its storage. Use this metric to help measure host workload against the storage system.
Port to Disk Send I/O Rate (ops/s)
The average number of IOs per second that are sent from the storage system to the back-end storage it is virtualizing. Use this metric to help measure the rate of data that is sent to back-end storage.
Port to Disk Receive I/O Rate (ops/s)
The average number of exchanges per second that are received from back-end storage resources.
Total Port to Disk I/O Rate (ops/s)
The average number of IOs per second that are transmitted between the storage system and the back-end storage it is virtualizing. Use this metric to help measure the rate of data that is sent to back-end storage.
Port to Local Node Send I/O Rate (ops/s)
The average number of IOs per second that are sent to other nodes within the local cluster.  Use this metric to understand the rate of inter-cluster communication.
Port to Local Node Receive I/O Rate (ops/s)
The average number of IOs per second that are received from other nodes within the local cluster.  Use this metric to understand the rate of inter-cluster communication.
Total Port to Local Node I/O Rate (ops/s)
The average number of IOs per second that are transmitted between the resource and other nodes within the local cluster.  Use this metric to understand the rate of inter-cluster communication.
Port to Remote Node Send I/O Rate (ops/s)
The average number of IOs per second that are sent to nodes that are in a remote cluster.  Use this metric to understand the amount of remote replication workload.
Port to Remote Node Receive I/O Rate (ops/s)
The average number of IOs per second that are received from nodes that are in a remote cluster.  Use this metric to understand the amount of remote replication workload.
Total Port to Remote Node I/O Rate (ops/s)
The average number of IOs per second that are transmitted between the resource and nodes that are in a remote cluster.  Use this metric to understand the amount of remote replication workload.
Port Send Data Rate (MiB/s)
The average rate at which data is sent from the port. The rate is measured in MiB per second. A send operation is a read operation that is processed, or a write operation that is initiated by the port.
Port Receive Data Rate (MiB/s)
The average rate at which data is received by the port. The rate is measured in MiB per second. A receive operation is a write operation that is processed, or a read operation that is initiated by the port.
Total Port Data Rate (MiB/s)
The average rate at which data is transferred through the port. The rate is measured in MiB per second and includes both send and receive operations.
Port to Host Send Data Rate (MiB/s)
The average rate at which data is sent to host computers. The rate is measured in MiB per second.
Port to Host Receive Data Rate (MiB/s)
The average rate at which data is received from host computers. The rate is measured in MiB per second.
Total Port to Host Data Rate (MiB/s)
The average rate at which data is transmitted between host computers and the component. The rate is measured in MiB per second and includes both send and receive operations.
Port to Disk Sph_port_send_bandwidth_percentageend Data Rate (MiB/s)
The average rate at which data is sent to back-end storage resources. The rate is measured in MiB per second.
Port to Disk Receive Data Rate (MiB/s)
The average rate at which data is received from back-end storage resources. The rate is measured in MiB per second.
Total Port to Disk Data Rate (MiB/s)
The average rate at which data is transmitted between back-end storage resources and the component. The rate is measured in MiB per second and includes both send and receive operations.
Port to Local Node Send Data Rate (MiB/s)
The average rate at which data is sent to other nodes that are in the local cluster. The rate is measured in MiB per second.
Port to Local Node Receive Data Rate (MiB/s)
The average rate at which data is received from other nodes that are in the local cluster. The rate is measured in MiB per second.
Total Port to Local Node Data Rate (MiB/s)
The average rate at which data is transmitted between the component and other nodes that are in the local cluster. The rate is measured in MiB per second.
Port to Remote Node Send Data Rate (MiB/s)
The average rate at which data is sent to nodes that are in the remote cluster. The rate is measured in MiB per second.
Port to Remote Node Receive Data Rate (MiB/s)
The average rate at which data is received from nodes that are in the remote cluster. The rate is measured in MiB per second.
Total Port to Remote Node Data Rate (MiB/s)
The average rate at which data is transmitted between the component and nodes that are in the remote cluster. The rate is measured in MiB per second.
Port Send Bandwidth Percentage
The percentage of the port bandwidth that is used for send operations. This value is an indicator of port bandwidth usage that is based on the speed of the port.
Port Receive Bandwidth Percentage
The percentage of the port bandwidth that is used for receive operations. This value is an indicator of port bandwidth usage that is based on the speed of the port.
Overall Port Bandwidth Percentage
The percentage of the port bandwidth that is used for send and receive operations. This value is an indicator of port bandwidth usage that is based on the speed of the port.

Port error data

You can create performance reports that include the following information:

Link Failure Rate (count/s)
The average number of miscellaneous fibre channel link errors per second for ports. Link errors might occur when an unexpected Not Operational (NOS) is received or a link state machine failure was detected.
Loss of Sync Rate (count/s)
The average number of times per second that the port lost synchronization with its partner port. These types of errors usually indicate physical link problems, caused by faulty SFP modules or cables, or caused by faulty connections at the switch or patch panel. However in some cases this can also occur due to mismatching port speeds between the partner ports, when auto-negotiation of link speed is disabled.
Synchronization is assumed lost after a timeout interval expires.
Loss of Signal Rate (count/s)
The average number of times per second at which the port lost communication with its partner port. These types of errors usually indicate physical link problems, caused by faulty SFP modules or cables, or caused by faulty connections at the switch or patch panel. However, in some cases, this error can also occur when the maximum link distance between ports is exceeded, for the type of connecting cable and light source.
CRC Error Rate (count/s)
The average number of frames per second that are received in which a cyclic redundancy check (CRC) error is detected. A CRC error is detected when the CRC in the transmitted frame does not match the CRC computed by the receiver. For Brocade switches, this metric includes only the CRC Errors with a good end-of-frame (EOF) indicator.
Primitive Sequence Protocol Error Rate (count/s)
The average number of primitive sequence protocol errors per second that are detected.
This error occurs when there is a link failure for a port.
Invalid Transmission Word Rate (count/s)
The average number of bit errors per second that are detected.
Zero Buffer-to-Buffer Credit Timer (microseconds)
The number of microseconds that the port is not able to send frames between ports because there is insufficient buffer-to-buffer credit.
In Fibre Channel technology, buffer-to-buffer credit is used to control the flow of frames between ports. Buffer-to-buffer credit is measured from the last time that metadata was collected.
If this metric is not available, use the Port Send Delay Time metric instead.
Zero Buffer-to-Buffer Credit Percentage
The amount of time, as a percentage, that the port was not able to send frames between ports because of insufficient buffer-to-buffer credit. The amount of time value is measured from the last time that metadata was collected. In Fibre Channel technology, buffer-to-buffer credit is used to control the flow of frames between ports.
Port Congestion Index
The estimated degree to which frame transmission was delayed due to a lack of buffer credits. This value is generally 0 - 100. The value 0 means there was no congestion. The value can exceed 100 if the buffer credit exhaustion persisted for an extended amount of time. When you troubleshoot a SAN, use this metric to help identify port conditions that might slow the performance of the resources to which those ports are connected.