- Large number of "File not open for write errors, coming from Storage.Methods.Disk->write_file().

• Long startup times
• Cache cleanup -> removing old cache files
• Create a hashed directory structure to reduce the number of files in a given directory.
• More instrumentation and metrics behind cache usage and time.
• SQLite cache backend.
• memcached backend.
• Null cache backend. (Complete, in CVS)
• Simplify the on-disk hash key -> go from 2 md5 hashes to 1. (Complete, in CVS)
• Sometimes the cache takes up a lot of time, effectively blocking the server. (this may be partially resolved by chunking the cache expiration)

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