Enable RBS and FILESTREAM in SharePoint 2013 and SQL Server 2013
For information please see: http://technet.microsoft.com/en-us/library/ee748631.aspx
To change the minimum blob size used to store on the filing system please use the following command
$cbd = Get-SPContentDatabase “WSS_Content”
$cbd.RemoteBlobStorageSettings.MinimumBlobStorageSize=1048576
$cdb.Update()