[Dovecot] Best location for indexes?

[Brandon Lamb]

I cant seem to find anything via a google search, so if this has been
answered I apologize.

I am wondering if INDEX=MEMORY is going to give the best performance
versus files? I have a server with directly attached storage, 8 gigs
of ram, about 500 gigs of data.

I am ok with losing and having to rebuild the indexes on a reboot as
the last uptime was over 200 days