Documentation

Wafl-Check

Checks the filer for WAFL-related counters (e.g. consistency-points per second).

Usage

$ check_netapp_pro.pl Wafl -H <host> [-z cp_count] [-l 'wafl_avail_bufs generated CP'|...] [--help] [...]

Description

Checks the filer for WAFL-related counters like the rate of consistency-points (cp) per second. Since there are different counters for different types of cp you have to specify the label of the cp-type.

A list of supported counters and it's labels is printed via the --counter switch.

The information gathered from this plugin corresponds to the CPty-column of sysstat -x 1. The most interesting types are

back-to-back CP: The filer is having a tough time keeping up with writes.
deferred back-to-back CP: The back to back condition is getting worse.

Hint: Calling the getter with the switch --discover=counters will explain each available counter in detail.

Simple Examples

[S1] ./check_netapp_pro.pl Wafl -H filer -l 'back-to-back CP'

Check the rate of back-to-back CP.

NETAPP_PRO WAFL OK - 1 file system checked.
wafl: 0.0/s cp_count (back-to-back CP)
| wafl=0/s;10;20;0;

[S2] ./check_netapp_pro.pl Wafl -H filer -l 'deferred back-to-back CP'

Check the rate of deferred back-to-back CP.

NETAPP_PRO WAFL OK - 1 file system checked.
wafl: 0.0/s cp_count (deferred back-to-back CP)
 | wafl=0/s;10;20;0;

Advanced Examples

Hint: The input for advanced examples is shortend. Replace the '...' below with ‑H <your filers ip or host-name>

[A1] ./check_netapp_pro.pl Wafl ... --explore=counters

Shows all counters and its labels supported by the check.

Counters (unit) supported by wafl:
 cp_count (/s)
 Labels of cp_count:
 wafl_timer generated CP
 snapshot generated CP
 wafl_avail_bufs generated CP
 dirty_blk_cnt generated CP
 full NV-log generated CP
 back-to-back CP
 flush generated CP
 sync generated CP
 deferred back-to-back CP
 container-indirect-pin CP
 low mbufs generated CP
 low datavecs generated CP