If you have Performance Advisor (Operations Manager 4.x or OnCommand 5) running in the environment you can create a view to monitor the FlashCache cards' performance. It's easier on the eyes and brain than watching CLI based stats in my opinion.
Here's the KB on how to do it: https://kb.netapp.com/support/index?page=content&id=1012673
There's an error in the KB at the following line though:
dfm option set perfAdvisorShowDiagCounters=enable
should be
dfm option set perfAdvisorShowDiagCounters=Yes
From: toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of Woods, Mark Sent: Monday, December 12, 2011 5:16 PM To: Jeff Mohler; Fletcher Cocquyt Cc: toasters@teaparty.net Subject: RE: Installing & Testing Flash Cache cards
This NetApp technical report has some information that will be helpful, including how to exclude/include data from specific volumes. There is a link to it on the Flash Cache web page of NetApp.com.
Flash Cache and PAM Best Practices Guide http://media.netapp.com/documents/tr-3832.pdf
From: toasters-bounces@teaparty.netmailto:toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net]mailto:[mailto:toasters-bounces@teaparty.net] On Behalf Of Jeff Mohler Sent: Monday, December 12, 2011 3:03 PM To: Fletcher Cocquyt Cc: toasters@teaparty.netmailto:toasters@teaparty.net Subject: Re: Installing & Testing Flash Cache cards
1) Just put it in the preferred slot, according to the NOW site docs for your box. 2) You can use the priority command to set a volume to keep/reuse/never status in PAM (very nice) 3) Cache Age, is next to...useless. It used to mean something, back in 5.0 and earlier...but you wanna use On Mon, Dec 12, 2011 at 2:39 PM, Fletcher Cocquyt <fcocquyt@stanford.edumailto:fcocquyt@stanford.edu> wrote: We are taking delivery of a couple flash cache cards (512Gb demo units) soon. I plan to install them in our standby 3270 cluster then present several cache enabled volumes for various benchmark us cases (Oracle, VMware, Web etc)
Qs: 1 - how easy/hard is the physical installation? Any gotchas to avoid? 2 - can I enable / disable caching on the volumes to help define the benefit flash cache is providing? 3 - how do I best monitor the flash cache metrics (I use cacti to graph "Cache Age" currently)..so..
Check the wafl:wafl:read_io_* stats. That will show WHERE requested blocks are being service from:
wafl:wafl:read_io_type.cache:95% wafl:wafl:read_io_type.ext_cache:4% wafl:wafl:read_io_type.disk:0%
Put that together with PAM stats using the stats command to review the status of the ext_cache_obj counters..and you will learn and see a lot. :)
thanks
-- Fletcher Cocquyt Principal Engineer Information Resources and Technology (IRT) Stanford University School of Medicine [cid:image001.jpg@01CCB8F6.202E1BA0] Email: fcocquyt@stanford.edumailto:fcocquyt@stanford.edu Phone: (650) 724-7485tel:%28650%29%20724-7485
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