topic Re: Intelligent Caching and NetApp Flash Cache in AFF

Intelligent Caching and NetApp Flash Cache

JohnChen — Wed, 04 Jun 2025 22:22:18 GMT

I have FAS3140 with PAMII - 256GB.

The version is 7.3.7P2 - 7 mode.

I upgrade it to be 8.1.4P1 - 7 mode.

Flash cache works fine after upgrade. However, it noly shows 128GB from Oncmomand Manager System 3.1.2 console.

I also run stats show ext_cache_obj and it shows ext_cache_obj:ec0:size:128 as well.
Am I expected to see this or something goes wrong?

Where is another 128GB ?

Re: Intelligent Caching and NetApp Flash Cache

asulliva — Fri, 08 Jan 2016 19:15:21 GMT

If you haven't already, I would open a support case. Looking at the IMT your configuration appears to be supported, so you'll definitely want to get them involved.

Andrew

Re: Intelligent Caching and NetApp Flash Cache

scottgelb — Fri, 08 Jan 2016 21:09:03 GMT

I remember a release note about the card behing halved like this... flashcache was not supported 8.1 but pamii still was from what I recall.. I can't find the doc or engineering update though but do remember seeing this before.

Re: Intelligent Caching and NetApp Flash Cache

JohnChen — Mon, 11 Jan 2016 12:44:12 GMT

This is due to bug 528788.

http://mysupport.netapp.com/NOW/cgi-bin/bol?Type=Detail&Display=528788

 Data ONTAP 8.0.4 & 8.1.2 and later contain improvements which are expected
 to reduce the severity of the memory contention.  
 
 In case of FAS3140 storage controller, Data ONTAP 8.1.2 and later would 
 reduce Flash Cache usage by 50% to avoid over memory subscription.