Is it safe to put <configdirectory>/proc and <configdirectory>/lock on a tmpfs filesystem?
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It's safe to put both of these in tmpfs, and since they're fairly busy 
it's a good idea for performance reasons. Further, nothing ever removes 
files from <configdirectory>/lock/, so it's probably a good idea in 
general to mount that on tmpfs such that a reboot will purge it. The 
Cyrus code will create all the necessary directory structure under 
<configdirectory>/lock on-demand. 

