Hello, I would appreciate your suggestions on how to resolve high I/O wait that causes SmarterMail to freeze and require a restart at least once or twice a day:
I’m running the latest Linux build on AWS with 16 cores and 32GB of RAM. The root partition is at 33% usage. The server hosts roughly 1800 email accounts, some exceeding 50GB each. Total storage is 11TB, with 3TB on SSD and 8TB on slower HDD.
Within SmarterMail, I’ve configured emails older than 90 days to be moved to slower storage. On a typical day, there are 250 IMAP connections and 100 MAPI connections, with the rest using webmail.
Current settings:
Max IMAP connections: 500
Max IMAP retrieval threads: 5
IMAP retrieval interval: 10 minutes
Outgoing mail is handled by MailChannels.
The I/O wait spikes occur once or twice daily. However, yesterday the issue worsened when two users with ~70GB mailboxes initiated Outlook archiving to reduce mailbox size. This causes a restart every 10 minutes.
What configuration changes or best practices would you recommend to mitigate this issue? Moving all storage to SSD is not financially viable.
Thank you in advance.