wafl.cop events

Contributors

wafl.cop.flowcontrol.end

Severity

NOTICE

Description

This message occurs when the system is out of the flow control mode which was earlier initiated as a high number of volumes were receiving modify operations concurrently beyond a certain threshold.

Corrective Action

(None).

Syslog Message

The node is out of the flow control mode which was earlier initiated as a high number volumes were receiving modify operations concurrently beyond a certain threshold (%lu).

Parameters

high_concurrency_flowcontrol_thres (LONGINT): System defined threshold beyond which high-concurrency flow control mode is triggered.

wafl.cop.flowcontrol.start

Severity

NOTICE

Description

This message occurs when the system is in a very high concurrency mode; i.e., when a high number of volumes receive modify operations concurrently beyond a certain threshold. The system is automatically getting into a flow control mode, where it may hold ops on certain volumes for longer time in order to reduce high-concurrency related impacts.

Corrective Action

If the flow control situation is long-lived, and the delays are not acceptable, the concurrency level among the volumes need to be brought down by moving the volumes (preferably the ones encountering delays) out of this node.

Syslog Message

Very high number of volumes (%lu) are receiving modify operations concurrently. The node is in a flow control mode (threshold: %lu). As a result few volumes may experience higher delay in latency.

Parameters

concurrent_vvols_cnt (LONGINT): Number of volumes actively receiving modify operations.
high_concurrency_flowcontrol_thres (LONGINT): System defined threshold beyond which high-concurrency flow control mode is triggered.

wafl.cop.high.concurrency

Severity

NOTICE

Description

This message occurs when the system is in high-concurrency mode; i.e., when a high number of FlexVol® volumes receive modify operations concurrently during a monitoring interval. High concurrency might cause degradation in performance.

Corrective Action

(None).

Syslog Message

A high number of FlexVol volumes are receiving modify operations concurrently. Interval (ms): %lu, Aggregate: %s, Frequency: %lu out of %lu times, Threshold criteria: more than %u FlexVol volumes were concurrently receiving modify operations, Distribution: %s.

Parameters

monitoring_interval (LONGINT): Duration of monitoring interval in milliseconds.
aggr (STRING): Name of the aggregate.
cp_above_vvol (LONGINT): Number of Consistency Points (CPs) with FlexVol volumes participating above the vvol_threshold value in this monitoring interval.
total_cp_in_interval (LONGINT): Number of CPs that happened in the monitoring interval.
vvol_threshold (INT): Minimum number of FlexVol volumes in a CP to call it a "highly concurrent CP".
histogram (STRING): A histogram [b1 : v1, b2 : v2, …​, b8 : v8], where "b" represents bin ID and "v" represents count of the corresponding bin ID.