| Measurement |
Description |
Measurement Unit |
Interpretation |
| State |
Indicates the current state of this Host Bus Adapter. |
|
The values reported by this measure and their numeric equivalents are available in the table below:
| Measure Value |
Numeric Value |
| Startup |
1 |
| Uninitialized |
2 |
| Initializing Firmware |
3 |
| Link Not Connected |
4 |
| Waiting For Link Up |
5 |
| Online |
6 |
| Link Disconnected |
7 |
| Resetting |
8 |
| Offline |
9 |
| Offlined by user/system |
10 |
Note:
This measure reports the Measure Values listed in the table above to indicate the current state of this HBA. However, in the graph of this measure, the state is indicated using only the Numeric Values listed in the above table. |
| Is_standby |
Indicates whether/not this HBA is in standby mode. |
Number |
The values reported by this measure and their numeric equivalents are available in the table below:
| Measure Value |
Numeric Value |
| Yes |
1 |
| No |
0 |
Note:
This measure reports the Measure Values listed in the table above to indicate whether this HBA is in standby mode. However, the graph of this measure will be represented using only the Numeric Values listed in the above table. |
| Queue_depth |
Indicates the number of I/O operations that can be run simultaneously i.e., in parallel in the ports of this HBA. |
Number |
A low value is desired for this measure. A high value is characterized by poor response time for the I/O operations and a queue full message. Too many I/O operations may fill the port queue to the maximum leading to a queue full message to the HBA. When a high value occurs, the host operating system may throttle the I/Os to a minimum or otherwise the I/Os may fail leading to performance bottleneck of the storage system. |
| SPF_optical |
Indicates whether/not the configuration of this small form-factor pluggable (SFP) optical transceiver valid. |
|
The SFP optical transceiver serves as the interface to a fiber optic or copper networking cable. Installed SFPs that are not supported for the configuration become invalid and result in connection issues.
The values reported by this measure and their numeric equivalents are available in the table below:
| Measure Value |
Numeric Value |
| Yes |
1 |
| No |
0 |
Note:
This measure reports the Measure Values listed in the table above to indicate whether the configuration of this SFP optical transceiver is valid. However, the graph of this measure will be represented using only the Numeric Values listed in the above table. |
| Resets |
Indicates the number of times the selective Reset LIP (Loop Initialization Primitive) occurred during the last measurement period. |
Number |
Loop Initialization is an essential process for allowing new devices onto the loop, assigning Aribrated Loop Physical Addresses (AL_PAs), providing notification of topology changes, and recovering from loop failure. Following loop initilaization, the loop enters a stable monitoring mode and resumes normal activity. Depending on the number of normal ports (NL_Ports) attached to the loop, an entire loop initialization may take a few milliseconds. A loop initialization can be triggered by a number of causes, the most common being the introduction of a new device. The new device could actually be a former device that has been powered on, or an active device that has been moved from one hub port to another.
A number of ordered sets have been defined to cover the various conditions that an NL_port may sense as it launches the initialization process. These ordered sets, called loop initialization primitive sequences, are referred to collectively as LIPs. An NL_Port issues atleast 12 LIPs to start loop initialization. During loop initialization, each downstream device that are part of the loop receives the LIP stream and enters a state known as Open-init, which suspends any current operations and prepares the device for the loop initialization procedure. The LIPs are forwarded along the loop until all NL_ports, including the originator of the loop, are in Open-init state. At this point, a temporary loop master is selected for conducting the rest of the initialization procedure. The first task of the temporary loop master is to issue a series of four frames that will allow each device on the loop to select a unique AL_PA. A LIP reset is used to perform a vendor specific reset at the loop port specified by this AL-PA value. These LIP resets are used to temporarily cure connectivity issues. Prolonged resets should be noted and the underlying actual connectivity issues should be resolved. |
| Crc_errors |
Indicates the number of Cyclic Redundancy Check (CRC) errors that occurred during data trafficking in the FC ports of this HBA, during the last measurement period. |
Number |
CRC or Cyclic Redundancy Check is a process that helps in identifying any errors that might occur during the data transmission process. Data is usually transmitted in small blocks, and a CRC value is assigned to each block and transmitted along with it. This CRC value is verified at the destination to ensure that it matches the CRC value transmitted from the source. A CRC error occurs when the two values (source and destination) do not match and the test fails. The main benefit of CRC is that it helps you ensure that data you have received or downloaded is not damaged or corrupt.
By comparing the value of this measure across all FC ports, you can accurately identify most error-prone FC port. |
| Discarded_frames |
Indicates the number of frames that were discarded during the last measurement period. |
Number |
Ideally, the value of this measure should be 0. |
| Initiators_connected |
Indicates the number of initiators that were connected to this HBA during the last measurement period. |
Number |
|
| link_breaks |
Indicates the number of times the link failed (broke) during the last measurement period. |
Number |
Ideally, the value of this measure should be 0. |
| Spurious_interrupts |
Indicates the number of spurious signals in the cable during the last measurement period. |
Number |
|
| Protocol_errors |
Indicates the number of Fiber Channel Protocol (FCP) errors that occurred during the last measurement period. |
Number |
Ideally, the value of this measure should be 0. |
| Scsi_dropped |
Indicates the number of SCSI requests that were dropped since the last measurement period. |
Number |
|
| Logins |
Indicates the total number of logins during the last measurement period. |
Number |
|
| Logouts |
Indicates the total number of logouts during the last measurement period. |
Number |
|