If your workload fills the cache, it should be. If your workload churns or is smaller then the amount of cache, it could not. Either way, it speaks to if block are ejected/invalidated due to size constraints of the cache.
Maybe netapp should expose some new counters for reasons why a block was invalidated, or ejected.
-Blake
On Mon, Sep 19, 2011 at 1:48 PM, Eugene Vilensky evilensky@gmail.com wrote:
On Mon, Sep 19, 2011 at 3:37 PM, Blake Golliher thelastman@gmail.com wrote:
. (stats show -i 1 ext_cache_obj:ec0:usage for example).
Nitpicking on this example, isn't this a stat for % full? That is, on a system which is warmed up, it should be at 100% at all times? I found this useful for what I needed to do with DFM and flash cache:
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