Tuesday, April 1, 2014

BLOB cache for Sharepoint

BLOB cache for Sharepoint

Blob cache is used in Sharepoint that to cache the Larger files.In the below Article I explained in very details About the Caches


BLOB Cache/Disk-based caching controls caching for binary large objects (BLOBs) such as image, sound, video, and some static content files like CSS. Disk-based caching is fast. It eliminates the need for database round trips. BLOBs are retrieved from the database once and stored on the Web client. Further requests are served from the cache and trimmed based on security. 

How to enable BLOB caching:

1.   BLOB Cache needs to be enabled from Web.Config.
2.   Make sure that there is enough space in the drive/server where blob cache is stored.
3.   It’s important to understand that BLOB cache is per-machine. So make sure that the BLOB cache settings are consistent across the whole farm. You don’t want one server with 1 GB of BLOB cache and another server with 4 GB of BLOB cache. You might see strange and inconsistency in performance if you don’t configure BLOB cache consistently.
4.   By default, the disk-based BLOB cache is off and must be enabled on the front-end Web server.
5.   In order to enable BLOB cache, locate the Web.Config for the web application and edit it.
6.   The recommended approach for making such changes in Web.Config file is through a feature receiver or PowerShell by making use of SharePoint’s SPWebConfigModification class.

In the Web.Config file, find the following line: 

<BlobCache location="" path="\.(gif|jpg|jpeg|jpe|jfif|bmp|dib|tif|tiff|ico|png|wdp|hdp|css|js|asf|avi|flv|m4v|mov|mp3|mp4|mpeg|mpg|rm|rmvb|wma|wmv)$" maxSize="10" enabled="false" />

In this line, change the location attribute to specify a directory that has enough space to accommodate the cache size.

To add or remove file types from the list of file types to be cached, for the path attribute, modify the regular expression to include or remove the appropriate file extension. If you add file extensions, make sure to separate each file type with a pipe (|), as shown in this line of code.

To change the size of the cache, type a new number for maxSize. The size is expressed in gigabytes (GB), and 10 GB is the default. It is recommended that you not set the cache size smaller than 10 GB. When you set the cache size, make sure to specify a number large enough to provide a buffer at least 20 percent bigger than the estimated size of the content that will be stored in the cache.

To enable the BLOB cache, change the enabled attribute, from "false" to "true".

<BlobCache location="E:\DATA\BlobCache" path="\.(gif|jpg|jpeg|jpe|jfif|bmp|dib|tif|tiff|themedbmp|themedcss|themedgif|themedjpg|themedpng|ico|png|wdp|hdp|css|js|asf|avi|flv|m4v|mov|mp3|mp4|mpeg|mpg|rm|rmvb|wma|wmv|ogg|ogv|oga|webm|xap)$" maxSize="1" enabled="true" />

After enabling blob cache in web.config, do an IISRESET and browse to the /settings.aspx first, instead of home page (Collaboration portal site).
When we browse to the settings.aspx, it will create the following files change.bin, dump.bin and flushcount.bin (all the files will be 1KB in size).
Browse to the home page now, it will create a folder PUBLISHINGIMAGES, all the images rendered from the database will be stored here and the above bin files will also get updated (we can see the difference in file size)
You can use an STSADM command to flush all BLOB caches associated with a specified Web application on different Web front-end computers on the farm:  

stsadm –o setproperty –propertyname blobcacheflushcount –propertyvalue 11 –url http://mywebapp::port

Please Comment if you need Any Help.Your Feed back is always Welcome.I Am Happy to Help !!!!!

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