On 22 Nov 2006, at 19:10, Sarah Walters wrote:
Only a single machine can have write privileges to the mailboxes database at a time.
Actually, only a single process can be writing to a mailboxes database at a time.
Then, assuming the database is closed between changes (can a developer please confirm whether it is kept open by master or not?) you should be able to run multiple IMAP servers over the same filesystem stored on a NAS (network-attached storage, as opposed to SAN).
I'm not sure why closing the database between changes might be important. Multiple imapd processes on backends all access the same mailboxes database. Writes are serialized with locks. If a network filesystem implements these locks correctly, there's no reason why you couldn't run multiple "backends" against a single redundant filesystem. There are a number of examples of people doing this.
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