| Measures reported by VnxSpPortTest
Storage ports help the storage processors receive and process I/O requests. These ports typically take the SCSCI IDs, 0 through 3. By periodically checking port status and measuring the I/O load on the ports, you can identify overloaded ports, isolate the storage processor they support, and thus proactively detect potential/existing load-balancing irregularities and/or processing bottlenecks with the storage processors. The VnxSpPortTest test facilitates this port check.
For every port configured on each of the storage processors (A and B) supported by the VNX storage system, this test reports the port state, the I/O load on the ports, the processing ability of the ports, and the SFP state. In the process, the test not only points administrators to overloaded ports, but also puts a finger on ports that are slow when processing I/O requests.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| Link_state |
Indicates the link state of this port. |
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If the storage port is up and running, then this measure will report the value Up. If not, then, this measure will report the value Down.
The numeric values that correspond to each of the states discussed above are available in the table below:
| Numeric Value |
Measure Value |
| 0 |
Down |
| 1 |
Up |
Note:By default, this measure reports the above-mentioned Measure Values to indicate the link state of the port. The graph of this measure however, represents the port status using the numeric equivalents - 0 or 1. |
| Port_state |
Indicates the current state of this port. |
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The operational state of a port can be Online, Offline or Not Applicable.
The numeric values that correspond to each of the states discussed above are available in the table below:
| Numeric Value |
State |
| 1 |
Online |
| 2 |
Offline |
| 0 |
Not Applicable |
Note:By default, this measure reports the above-mentioned States to indicate the status of the port. The graph of this measure however, represents the port status using the numeric equivalents - 0 to 2. |
| SFP_state |
Indicates the current state of the SFP on this port. |
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Small form-factor pluggable (SFP) modules are compact, hot-pluggable transceivers inserted into the SFP or SFP+ slot of an I/O module in a Block and File VNX5300 platform. This transceiver module provides uplink optical interfaces, laser send or transmit (TX) and laser receive (RX). This measure reports the current state of this module.
The values that this measure can report and their corresponding numeric values are listed in the table below:
| Numeric Value |
Measure Value |
| 1 |
Online |
| 2 |
Faulted |
| 3 |
Other |
| 0 |
Removed or None |
Note:By default, this measure reports the above-mentioned Measure Values to indicate the status of a port. The graph of this measure however, represents the port status using the numeric equivalents - 0 to 3. |
| Reads |
Indicates the number of reads per second made on this port. |
Reads/Sec |
Comparing the value of these measures across ports will clearly indicate which port is overloaded - it could also shed light on irregularities in load balancing across the ports. |
| Writes |
Indicates the number of writes per second made on this port. |
Writes/Sec |
| Data_reads |
Indicates the rate at which data is read through this port. |
Blocks/Sec |
These measures are good indicators of the I/O processing ability of the ports. You can also compare the value of these measures across ports to identify which port is the slowest when handing I/O requests, and which processor that port is configured on. By closely tracking the value of these measures for that port over time, you can proactively detect potential processing bottlenecks and also figure out when the slowdown occurs - when reading from or writing to the storage processor? |
| Data_writes
| Indicates the rate at which data is written through this port. |
Blocks/Sec |
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