In a scenario where you have a VM lamp cluster that is limited on the performance in storage but have a reasonably large amount of RAM available has any admins tried experimenting have the localcachedir pushed to TMPFS?
Does Moodle control how large the localcachedir can get?
How long do the files remain in the local?
Since these files are read only I would think it would not be a big deal if this data is lost. I am experimenting with using a memcached server and using OPCache but wanted to see if setting localcachedir to TMPFS would see any major improvement as well. If you have OPCache (push to TMPFS) and memcached server would you even need to use localcache?
What would be some of the ramifications of doing this?