For migration of mailbox (including /var/lib/imap and /var/spool/imap), we are using rsync (rsync -avpzH --progress --stats). The total size of mail box (/var/spoo/imap) is 320GB on the old hardware. After rsync is finished running we see the size of /var/spool/imap on the new hardware to be 320GB. After the rsync operation, when reconstruct is run and finished the size of /var/spool/imap is reduced to around 190GB. We find that for some mail boxes, the number of messages is reduced (getting deleted) drastically. For example, before reconstruct, if a particular user is having more than 100 messages, after reconstruct we are observing that the number of messages are very few (few 10's). This is happening for random users. We tried reconstruct on the older hardware also, and found the same behaviour. We have also tried with cyrus-imapd-2.3.16 on the new hardware and saw the same result. Can someone explain/suggest what is happening here and is this a possible bug in reconstruct (cyrus-imapd)
"reconstruct" expunges messages that are marked as deleted, unless you specify the -k flag. That could explain it.
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