2014-04-13 11:32 PM
Currently we are suffering from high CPU on compression en de-compression on our CIFS only filer. A sent perfstat.out to Netapp states that the CPU is working hard to decompress files while accesing them.
Is there a way to monitor compression en de-compression action with specific counters in DFM, or command line?
And what are the counters to look at? When do we reach a bottleneck, so we need to turn it off.
Users experience slow CIFS access on this filer. Sometimes it is slow, some time it is fast. There is not really a pinpoint on exact time.
2014-04-14 03:53 AM
This is one of the most interesting questions I've seen recently !
The short answer -
As far as I can tell compression and decompression is part of the kahuna domain - it isn't CIFs specific.
You might want to try and look for a correlation between CPU(or kahuna) and cifs read activity in OnComand Unified Manager (DFM).
I don't advise customers to turn on compression in high read activity environs, we do caution that it can be a CPU hit on decompression.
I'm going to try and run some tests on my lab environ here, and see if I can tell you any more...
I hope this response has been helpful to you.
At your service,
Eugene E. Kashpureff
Senior Netapp Instructor, Unitek Education
(P.S. I appreciate points for helpful or correct answers.)
Me thinks I'm in love with my job !