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SharePoint 2013 Distributed Cache Service

SharePoint 2013 Distributed Cache Service. Steve Peschka Sr. Principal Architect Microsoft Corporation. Cache Service. There is a new distributed cache service in SharePoint 2013 based on Windows Server AppFabric Distributed Caching

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SharePoint 2013 Distributed Cache Service

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  1. SharePoint 2013 Distributed Cache Service Steve Peschka Sr. Principal Architect Microsoft Corporation

  2. Cache Service There is a new distributed cache service in SharePoint 2013 based on Windows Server AppFabric Distributed Caching It is used in features like authentication token caching and My Site social feeds SharePoint 2013 uses caching features that cloud-based cache (Windows Azure Cache) does not support at this time, so only local cache hosts can be used SharePoint ONLY supports the version of caching that it ships – you cannot independently upgrade it.

  3. Cache Service The config DB keeps track of which machines in the farm are running the cache service It is all provisioned by SharePoint setup A new Windows service – the Distributed Cache service – is installed on each server in the farm when SharePoint is installed

  4. Cache Service SharePoint installs and starts the Distributed Cache service on each server in the farm • It is enabled by default on all servers in the farm except for SQL • You can disable it on a server by using the Services on Server admin page in central admin, BUT – you should use the PowerShell cmdlets to gracefully control it

  5. Cache Setup The farm account is used as service account for Cache Service Like user profile service in SharePoint 2010, during setup the service account should have elevated privileges (i.e. local admin) After setup is complete you should lower the privileges for the account

  6. Distributed Cache in SharePoint 2013 (Default Config) Distributed Cache service (Windows service) Distributed Cache service (Windows service) Distributed Cache service (Windows service) Distributed Cache service (Windows service) Distributed Cache service (Windows service) Other Service Apps Other Service Apps Distributed Cache service (Windows service) Other Service Apps Cluster configuration stored in config DB

  7. General Cache Server Sizing Guidelines Cache servers use about 50% of allocated memory for overhead The maximum recommended RAM per cache server is 16GB Above that will work, but when flushing cache it may take so long to clear out that the server can appear hung You should allocate 2GB RAM to the OS That leaves a maximum of 14GB for cache: 7GB storage and 7GB for overhead Sizing info will be available that will help you determine how much overall cache storage your farm requires In the example above, take total storage required / 7GB = # of cache servers needed

  8. Cache Implementation We recommend that you use servers dedicated to caching – not shared with WFE or service applications The data as a whole is divided and distributed between all cache servers If a server goes down unexpectedly, user performance will suffer until other servers become populated with the data that was lost This process can be accelerated with: User Profile Service - Feed Cache Repopulation Job timer job Clear-SPDistributedCacheItem, Update-SPRepopulateMicroblogLMTCache and Update-SPRepopulateMicroblogFeedCache PowerShell cmdlets If you know you are going to bring a cache server down you should do so gracefully with the Stop-SPDistributedCacheServiceInstancecmdlet This copies the data to other cache servers to minimize the performance impact

  9. Cache Server Performance There are hundred(s) of perf counters; there are also counts exposed via developer’s dashboard # of reads # of writes # of hits # of misses time for read time for write Total I/O (how much data has been transferred in a given period of time)

  10. Cache Service Health The following health rules have been created to help you track the Cache Service (look in the Availabilitysection for most): One of the cache hosts in the cluster is down (Availability) Firewall client settings on the cache host are incorrect (Configuration) Cache host is in throttled state(Availability) The high availability node for SharePoint distributed cache is not available(Availability) – happens when there are less than 2 servers running the cache service There exists at least one cache host in the cluster, which SP doesn't know about (Configuration) – happens when the cache service is disabled in SharePoint but AppFabric Caching Service is running on the machine Cached objects have been evicted(Configuration) – indicates eviction happened across the cache cluster. Not bad in and of itself but may be a clue if it happens frequently and/or there are perf issues

  11. © 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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