AFF, NVMe, EF-Series, and SolidFire Discussions

Flash Cache: which volume is breaking it?

vladimirzhigulin

Hi,

 

I have a filer with 512Gb FlashCache, please have a look at the graph generated by Performance Manger.

 

Questions:

 

1. Is it ok / normal to have 60% hit rate?

2. How can I tell what volume causes spikes in "miss" ~ every hour? I can not match it against workload of any volume, again looking at PM graphs.

 

Thanks,

Vladimir

2 REPLIES 2

Re: Flash Cache: which volume is breaking it?

AGUMADAVALLI

use the following command at ontap prompt:

stats show -p flexscale-access

stats show ext_cache_obj

You will have a better understanding of how flexcache  is working.

thank you,

AK G

Re: Flash Cache: which volume is breaking it?

vladimirzhigulin

AK G,

Thanks, i know about these two. It doesn't tell you which volume triggers "Evict" .. this is what I'm really after.

Vladimir

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