We are using the Shared Mailboxes in Dovecot Cluster architecture so the users mailbox should only be accessed by a single backend. We have been running with this architecture for about 2 years with dovecot version 2.3.19 and we had not seen any Inconsistency in map index` messages in the logs.
We had already increased the default vsize_limit to 512M for the lmtp process but maybe we have to increase it more if this error will be occurring repeatedly. This is the relevant configuration stanza for the lmtp service for all backends. service lmtp { unix_listener lmtp { mode = 0666 }
inet_listener lmtp-mod { port = 24 ssl = no } service_count = 0
# Number of processes to always keep waiting for more connections. process_min_avail = 0 process_limit = 0
# If you set service_count=0, you probably need to grow this. vsz_limit = 512M client_limit = 1 } But the question is what causes this inconsistency and if there is any change on 2.3.21 version that might have introduced it, because we did not get any similar logs on previous versions. When this does occur is there a chance that a mailbox might get corrupted? Is the only way to safely mitigate this to wait for the index rebuild to finish?
Thank you, Nikos Pyrgiotis