We have been having intermittent performance issues with the Panasas filesystem today. This has caused logins and other file operations to hang for up to 30-40 seconds at a time.
Our Systems Team is looking into the issue. If the problem continues, or when we find the root cause of the issue, we'll post an update on our website and on Twitter (https://twitter.com/fsurcc).
In the meantime, thanks for your patience.