The "wafl" parameter you are asking for is one of the "hidden" mode performance parameters.
There are the privilege levels "admin", "advanced" and "XXX".
You will need "XXX", which I probably may not write down here. Ask your NetApp support guy for this word.
If not, you'll get a "Unknown/invalid object name 'wafl'"
ssh USER@FILERNAME "priv set -q XXX ; stats explain counters wafl cp_count"
will give you:
Counters for object name: wafl
Description: Array of counts of different types of CPs
Size: 13 column array
Column names: 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, wafl_avail_vbufs generated CP, deferred back-to-back CP, container-indirect-pin CP, low mbufs generated CP, low datavecs generated CP
For other subjects, like "system" this will be enough:
ssh USER@FILERNAME "stats explain counters system"
This answer was given by an FAS270 with NetApp Release 7.3.7P3. 🙂