ZFS: data sometimes not getting correctly flushed to disk (possible mmap/write issue)?

Peter Schuller peter.schuller at infidyne.com
Sun Feb 24 11:51:33 UTC 2008

> 3) ktracing gen2.py shows that the py-mutagen library seems to do both
> write()s and read/write mmap()s to the file to update the file.

FWIW, ever since a dovecot installation of mine was moved onto ZFS one gets 
sporadic 'internel errors' from dovecot. Dovecot logs that index files are 
corrupt, and marked broken. Recovery involves re-selecting the IMAP mailbox.

In response to your post, I recently turned OFF use of mmap in dovecot 
(mmap_disable = yes), and the problem seems to have gone away immediately.

If it should show up again in spite of mmap being disabled I will post a 
follow-up, but it's been long enough that I believe the problem to be gone.

/ Peter Schuller

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