Can someone tell me what the WAFL_Ex process means, it is @ 180% on my filer (sysstat -M)

[TOMASYAWORKS]

Can anyone tell me what the WAFL_Ex is when i read the output of the sysstat -M output is WAFL_Ex = 170 and (Kahu) 89%

Is there a good manual about the -M mode, cant find it.

[martin_fisher]

Hi - Have you read this thread here:

https://communities.netapp.com/thread/22448

[TOMASYAWORKS]

Tnx Martin, i did read it, but it is not answering my question, what does Wafl_ex en why is it at 180%.

They seem to have the same problem, but the bug is fixed in 8.2 GA, which i am running. Scrub is not completed, but suspended right now.

Tomas

[Marcfe]

Hello TOMASYAWORKS,

did you find a solution to this problem? Seems that we have the sam Problem with one of our customers: slow ndmp to tape, high WAFL_Ex and suspended aggr scrubs

Thank you

Marc

[hariprak]

Hi,

WAFL_ex represents parallel WAFL processing while Kahuna represents serial WAFL processing. These two logical domains are mutually exclusive, meaning either Kahuna can be active on 1 CPU, or WAFL_ex can be active on 1+ CPUs, but both Kahuna and WAFL_Ex cannot be active at the same time. Depending on the workload, it is possible for Kahuna to limit the amount of work that can be performed by WAFL_ex. It is important to note that this type of bottleneck is a simple variation on the previous condition.

For more details you can refer KB article https://kb.netapp.com/support/index?page=content&id=3014084&actp=search&viewlocale=en_US&searchid=1416471937172

Thanks