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I have experienced this on all versions of Dovecot that I?ve used (1.0 - 1.1b6) using IMAP (it?s difficult to test if it?s also there with POP3). What I see is that if there is a peak in disk usage at the time of a specific request that requests stalls. The saturation of disk I/O is momentary but when it?s done (maybe after one or two seconds) Dovecot still waits for its I/O operation instead of