Issue High Load on imapd Maildir

[armanmisdar]

Hi Guys, lately I notice my VPS server is crawling. It takes too long to load the control panel or any website hosted in it. Doing iotop command shows there's a high load on "imapd Maildir" process (refer to the attachment).

Plesk Obsidian 18.0.42

Any advice on how I can fix or reduce the load?

Thank you

 

[Monty]

Do lsof -p <pid> (example: lsof -p 8048) on the imapd process to figure out which Maildir it is (which mail address) and then investigate the maildir of that address. Maybe there are thousands of mails in that mailbox?

You seem to be using Courier-IMAP instead of Dovecot. From my personal experience I can tell you that the performance of Courier-IMAP is much worse than Dovecot. So you may consider switching to Dovecot, but please be aware that this needs careful planning and preparations:

https://support.plesk.com/hc/en-us/articles/115001873973-Is-it-better-to-choose-Dovecot-or-Courier-IMAP-on-Plesk-server-

 

[armanmisdar]

Thanks, Monty, I really appreciate the info provided. Will check it out