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feat(dovecot): disable fsync for LMTP and IMAP services

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This is aimed at reducing SSD wear level.
SSDs wear out because of writes
according to <https://superuser.com/a/440219/1777696>,
so anything reducing the writes should be helpful.

For online users Maildir format that we use
results in first storing the message in new/
and then moving to cur/ and then maybe even deleting
it immediately for users with a single device
or bots. Syncing all these changes to disk
is unnecessary and wears SSDs.
This commit is contained in:
link2xt
2026-04-17 18:52:53 +02:00
committed by l
parent 14dfabf2ff
commit 0aa08b7413
1 changed files with 8 additions and 0 deletions
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8
cmdeploy/src/cmdeploy/dovecot/dovecot.conf.j2
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@@ -133,6 +133,11 @@ protocol lmtp {
# mail_lua and push_notification_lua are needed for Lua push notification handler. # mail_lua and push_notification_lua are needed for Lua push notification handler.
# <https://doc.dovecot.org/2.3/configuration_manual/push_notification/#configuration> # <https://doc.dovecot.org/2.3/configuration_manual/push_notification/#configuration>
mail_plugins = $mail_plugins mail_lua notify push_notification push_notification_lua mail_plugins = $mail_plugins mail_lua notify push_notification push_notification_lua
# Disable fsync for LMTP. May lose delivered message,
# but unlikely to cause problems with multiple relays.
# https://doc.dovecot.org/2.3/admin_manual/mailbox_formats/#fsyncing
mail_fsync = never
} }
plugin { plugin {
@@ -252,6 +257,9 @@ protocol imap {
# sort -sn <(sed 's/ / C: /' *.in) <(sed 's/ / S: /' cat *.out) # sort -sn <(sed 's/ / C: /' *.in) <(sed 's/ / S: /' cat *.out)
rawlog_dir = %h rawlog_dir = %h
# Disable fsync for IMAP. May lose IMAP changes like setting flags.
mail_fsync = never
} }
{% endif %} {% endif %}