How to setup a quota for the whole "Mysite" webapplication in sharepoint 2007?
Is it possible in SharePoint 2010?
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You could do this indirectly by limiting the size of your content databases. Here's an example:
25 Mysites, each with a site collection quota of 2GB. Set your content database up pre-sized to 50GB with auto-grow disabled. Since you have control over the amount of content databases you are dictating how much space that web application can utilize.