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.eduwrote:
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 Email: *fcocquyt@stanford.edu* Phone: (650) 724-7485
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