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Statistics for FAS250/ FAS270 network interfaces

RECEIVE section statistics  Top

The following table describes the statistics in the RECEIVE section of the ifstat command output when you use the command on a FAS250/FAS270 network interface.

Statistic

Meaning

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 per minute of packets discarded due to unavailable resources.

Total frames

Total frames that are received on the interface.

Total bytes

Total bytes that are received on the interface.

Multi/broadcast

Total number of multicast or broadcast packets received.

Total discards

Total number of "No buffers" packets that were discarded even though no errors were detected.

No buffers

Number of times the driver could not allocate a buffer and a packet was dropped. This might happen when your storage system is very busy. If the count increases continually, it might indicate 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 a cluster configuration.

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.

Runt frames

Number of received frames that were less than the minimum size (64 bytes) and had a valid CRC.

Long frames

Number of received frames that were greater than the maximum size and had a valid CRC.

CRC errors

Number of packets received with bad CRC.

Length errors

Number of frames received by the MAC where the actual number of bytes received did not match the length given in the Ethernet header.

Code errors

The number of frames received by the MAC that had a code error signaled by the Physical (PHY) layer.

Dribble errors

The number of frames received by the MAC with an alignment error. This is not used for 1000Mb/s operation.

TRANSMIT section statistics  Top

The following table describes the statistics in the TRANSMIT section of the ifstat command output when you use the command on a FAS250/FAS270 network interface.

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 per minute of packets discarded due to unavailable resources.

Total frames

Total frames that are transmitted on the interface.

Total bytes

Total bytes that are transmitted on the interface.

Multi/broadcast

Total number of multicast or broadcast packets transmitted.

Total discards

Total number of packets that were discarded even though no errors were detected. This number is a sum of the "No buffers" and "Queue overflow" statistics.

Queue overflow

Number of outgoing packets dropped because the driver's queue was full. It might indicate a system problem.

No buffers

Number of times the driver fail to allocate a buffer for the transmit packet.

CRC errors

Number of packets transmitted by the MAC with CRC errors. This can happen only when the MAC is not appending the CRC to the transmitted packets.

Abort errors

Number of packets aborted during transmission. This could be because of a FIFO underrun.

Runt frames

Number of packets smaller than the minimum frame size (64 bytes) transmitted by the MAC.

Long frames

Number of packets larger than the maximum frame size transmitted by the MAC.

Single collision

Number of frames that encountered exactly one collision. Only valid in half-duplex mode.

Late collisions

Number of collisions that occurred outside the collision window. Only valid in half-duplex mode.

Deferred

Number of times a packet was aborted by the MAC due to excessive collisions during transmission.

If 16 consecutive collisions occur during transmission of a packet, the transmission is deferred and MAC aborts the packet.

LINK INFO section statistics  Top

The following table describes the statistics in the LINK INFO section of the ifstat command output when you use the command on a FAS250/FAS270 network interface.

Statistic

Meaning

Current state

Current state of the interface:

  • up or down--The state of the link.
  • cfg_down--The interface is configured down.
  • enabling--The interface is coming up.
Up to downs

Number of times the link toggled between up and down.

Speed

Speed of the link negotiated or set.

Duplex

Duplex of the link negotiated or set.

Flow Control

The operational flow control setting.

For information on how the operational flow control setting is determined, see Chapter 1, Network Interface Configuration.

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