Zitat von KT Walrus <ke...@my.walr.us>:
Does anyone have any idea of how many IMAP connections a single
cloud VM (4 vCores at 2.4GHz, 30GB RAM, local SSD storage -
non-RAID) can be expected to handle in production. The mailboxes are
fairly small (average 5MB total - 50MB max, as I don’t store
attachments in Dovecot expect those saved through IMAP in the
Sent/Drafts folders) and each user will probably have an average of
2 devices that have the mail clients configured to access each
mailbox.
Can such a server handle 100,000 mailboxes (200,000
devices/clients)? Or is it more like 10,000? Or, even smaller?
The bottleneck of IMAP-operations normally is the number of needed
IOPS for accessing the mail storage, which depends on the mean number
of concurrent users to be expected.
Can such a server handle this number of mailboxes? Most certainly yes.
The real question is: can such a server cope up with the expected load
of concurrent user sessions you are expecting?
