I have just moved my tor relay on a raspberry pi on a cheap microsd card, so I would like its I/O to reduce to a minimum to avoid destroying it in a month or so.
I have already set
AvoidDiskWrites 1 DirCache 0
Last thing I'd like to do is to replace all directories on which tor does I/O so that I can replace all of them (them) with a links to external HDs.
Raspberry is running Arch Linux ARM (alarm).