The ifstat command output displays several statistics when you use the command for the Quad Gigabit Ethernet Controllers.
The following table describes the statistics in the RECEIVE section of the ifstat command output:
Statistic | Definition |
---|---|
Frames/second | Rate of received frames per second. |
Bytes/second | Rate of received bytes per second. |
Errors/minute | Rate of errors (which led to frames being lost) per minute. |
Discards/minute | Rate of packets discarded per minute due to unavailable resources. |
Total frames | Total frames received by the interface. |
Total bytes | Total bytes received by the interface. |
Total errors | Total errors that occur on the interface. |
Total discards | Total number of packets that were discarded in spite of undetected errors. This number is a sum of the "No buffers", "Bus overruns", and "Queue overflows" statistics. |
Multi/broadcast | Total number of multicast or broadcast packets received. |
No buffers | Number of times the driver could not allocate a buffer and a packet was dropped. This might occur when your storage system is busy. If the count increases continually, it is an indication that a software component is not returning buffers. |
Non-primary u/c | Number of Ethernet frames received for the partner's MAC address after a failover in an HA pair. |
Tag drop | Number of tagged frames dropped on an interface that is not configured to support VLAN tagging. |
Vlan tag drop | Number of tagged frames dropped that do not match the VLAN tags configured on the interface. |
Vlan untag drop | Number of untagged frames dropped on an interface that is configured to be part of a VLAN. |
CRC errors | Number of packets received with bad CRC. |
Runt frames | Number of received frames that were less than the minimum size (64 bytes) and had a valid CRC. |
Fragment | Number of received frames that were less than the minimum size and had a bad CRC. |
Long frames | Number of received frames that were greater than the maximum size and had a valid CRC. |
Jabber | Number of received frames that were greater than the maximum size and had a bad CRC. |
Alignment errors | Number of frames that are misaligned and contain CRC errors. |
Bus overruns | Number of times the adapter's receive FIFO overflowed and a packet was dropped. This occurs when the bus is too busy and the adapter cannot transfer data into host's memory. This might also occur when your storage system CPU is too busy and cannot process the received packets fast enough. |
Xon | Number of XON frames received when receive or full flow control is enabled. |
Xoff | Number of XOFF frames received when receive or full flow control is enabled. |
Jumbo | Number of good packets received that were larger than the standard Ethernet packet size when jumbo frames are enabled. |
The following table describes the statistics in the TRANSMIT section of the ifstat command output:
Statistic | Meaning |
---|---|
Frames/second | Rate of transmitted frames per second. |
Bytes/second | Rate of transmitted bytes per second. |
Errors/minute | Rate of errors (which led to frames being lost) per minute. |
Discards/minute | Rate of packets discarded per minute due to unavailable resources. |
Total frames | Total frames that were transmitted on the interface. |
Total bytes | Total bytes that were transmitted on the interface. |
Total errors | Total errors that occur on the interface. |
Total discards | Total number of discarded packets even though no errors were detected. This number is a sum of the "No buffers" and "Queue overflows" statistics. |
Multi/broadcast | Total number of multicast or broadcast packets transmitted. |
Queue overflows | Number of outgoing packets dropped because the driver's queue was full and might indicate a system problem. |
No buffers | Number of times the driver failed to allocate a buffer for the transmit packet. |
Max collisions | Number of frames that encountered more than one collision, but less than the maximum allowed. Only valid in half-duplex mode. |
Single collision | Number of frames that encountered exactly one collision. Only valid in half-duplex mode. |
Multi collisions | Number of frames that encountered more than one collision, but less than the maximum allowed. Only valid in half-duplex mode. |
Late collisions | Number of collisions that occurred outside the collision window. Only valid in half-duplex mode. |
Xon | Number of XON frames transmitted when send or full flow control is enabled. |
Xoff | Number of XOFF frames transmitted when send or full flow control is enabled. |
Jumbo | Number of packets transmitted that were larger than the standard Ethernet frame size (1,518 bytes). |
The following table describes the statistics in the LINK INFO section of the ifstat command output:
Statistic | Meaning |
---|---|
Current state | Current state of the interface:
|
Up to downs | Number of times the link is switched between the up status and the down status. |
Speed | Speed of link negotiated or set. |
Duplex | Duplex of the link negotiated or set. |
Flow control | Operational (autonegotiated) flow control setting. |