How does AppFabric cache calculates the values for RequestCount, ReadRequestCount, WriteRequestCount and MissCount?

When I started to use the Get-CacheStatistics cmdlet to monitor caching activities more intensivley I was often confused. Here an example:

Should not be ReadCount+WriteCount = RequestCount? Why is WriteRequestCount increasing +2 although I just send one put request?

By talking to Microsoft support I figured out how AppFabric cache calculates its numbers (Thanks to Gayathri from Distributed Service Team). Number calculation behavior depends on your configuration, high availability and local cache have a major impact on it.

Activity	RequestCount	ReadRequestCount	WriteRequestCount	MissCount
DataCacheFactory is initialized and Named Cache is up	+1	-	-	-
Put item, not yet in local and server cache	+1	-	+1 (+2 with HA)	+1
Get item from local cache	-	-	-	-
Get item from server cache, local cache has expired	+1	+1	-	-
Get item, local and server cache has expired	+1	+1	-	+1

I hope this is helpful for you when you are analyzing the caching behavior for your application.

How to get started with Windows Server AppFabric easily

In my opinion it is really hard to get started with Windows Server AppFabric. There is good material, but it is shuffled around in different sources. A good intro can you find here: this all-in-one intro by Scott Hanslmann this caching intro by Wade Wegener Additional helpful resources are Microsoft's Introduction Part 1 and Microsoft's Introduction Part 2 by Jon Flanders Pluralsight's Hosting Fundamentals Pluralsight's Caching Introduction Microsoft's Caching Documentation Good books are Microsoft Windows Server AppFabric Cookbook and Pro Windows Server: AppFabric Please also watch out for software updates, currently there is CU 4 . To keep yourself updated subscribe to Distributed Services News Feed . Updated my list on 11.03.2014 with one more Download the Windows Server AppFabric Samples

How to fix Windows Server AppFabric Dashboard on Windows Server 2012 / Windows 8

Windows Server AppFabric is a great enhancement for IIS and its caching capabilities are great for .NET applications. But currently there is a very annoying bug regarding its monitoring UI, so called “Dashboard”. Especially for me as a non WF guy (I am actually just working with WCF) it was really hard to figure it out. Hence, many thanks to Gianluca from Distributed Services at Microsoft! Windows Server AppFabric Dashboard does not work on Windows Server 2012 / Windows 8. You will receive this error message "Unable to cast object of type 'System.Management.Automation.PSCustomObject' to type 'Microsoft.ApplicationServer.Management.Data.GroupByInfo'." This error will cause that you cannot see any request statistics neither WF nor for WCF: The reason is, I quote Microsoft here: "[...] the root cause is a powershell script embedded in AF code that returns different results when ran on Windows 2012. This script is about statistics for Idle & per...

How to delete Azure Active-Directories

When I was trying to delete an Azure Active-irectory by using the management portal I have received the error message “Directory contains one or more applications that were added by a user or administrator” and I was really confused. Then I found out this is a common issue. The solution was even more confusing, some PowerShell cmdlets are needed. Unfortunately I was not able to proceed, it was not possible to login with my Microsoft-ID to execute the needed commands. Here I found out I have to install the correct version of the tools. These are located here .

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