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Upload large files (>1GB) in SP2010

The default limit of a single upload file in SharePoint is 50MB.

The size limit can be increased upto 2GB, from central admin.
To increase the size limit and any issues faced during upload of large files, check the link below
http://blogs.technet.com/b/sharepointcomic/archive/2010/02/14/uploading-large-files-to-sharepoint-on-windows-server-2008-and-iis7.aspx

As given in the link, it is not recommended to upload large files of size greater than 500MB thru sharepoint.
The reason's why large file uploads are not recommended via browser is listed
  1. Reliably transferring gigabyte or bigger files without breakages over a protocol like HTTP, which is better suited for tiny transfers like images and text.
  2. Not killing your browser because it has to load all that in memory
  3. Not killing your web server because
    1. All that you upload through HTTP post, first gets streamed into IIS Memory, w3wp.exe memory before the ENTIRE FILE finishes uploading .. before it is stored. Which means,
      1. You cannot show an accurate and live progress bar of the upload, IIS gives you no such accurate metric of an upload. All the counters it gives you are approximate.
      2. Your w3wp.exe eats up all server memory – 4GB of it, for a 4GB upload.
      3. A thread is kept busy for the entire duration of the upload, thereby greatly limiting your web server’s capability to serve newer requests.
      4. Kills effective load balancing.
  4. Not killing your content database because,
    1. As you are uploading a very large file, that large file gets written sequentially into the DB, and therefore for a very large file very severely impacts the database performance.
Source - http://blah.winsmarts.com/2010-3-Large_File_Upload_in_SharePoint_2010.aspx

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