As archive storage is 10x cheaper and more plentiful than standard SSD storage, I was wondering if I could put part of the IMAP mail store onto that storage.
I'd like to create a new folder in an IMAP client called "Archive", move the /srv/example.co.uk/mailboxes/john.smith/Maildir/.Archive to the archive storage and create a symbolic link from the old location to the archive. I could then tell users that any mail placed in this folder doesn't count towards their quota, but its retrieval will be slower and it won't have an independent backup. I'd have a process that could move folders starting .Archive* in the mailboxes overnight in case the customer adds new folders within this folder.
The question is how slow? Is the Archive storage a physical disc closely connected to the VM with good latency and speeds, just different hardware, or is the data being squirted down a network pipe to an offsite store with latency and speed issues that would make this unworkable?