Hi. I recently tried to upgrade/migrate our Cyrus deployment from 2.2.13 (on Debian) to 2.4.17 (on Ubuntu 14.04). In our environment, user mailboxes (about 3TB of them) are on iSCSI volumes; everything else is on local disk (which I rsync'ed). I ran into some delays to do with the storage backend configuration, so I didn't actually get to the point of starting imapd on the new server until disturbingly close to the end of our announced downtime window. When I did, I saw that imapd wasn't responding and cyr_expire was running. I was expecting that, but eyeballing what it was doing via strace suggested that it would have taken *over twenty hours* to walk all the mailboxes. (I'm guessing that cyr_expire was doing, perhaps as a side effect, the "full re-parse of all messages, which may take a while" mentioned under "Upgrading from 2.4.3" at http://cyrusimap.org/docs/cyrus-imapd/2.4.17/install-upgrade.php.) So we announced that we were backing out of the upgrade. However, as I was getting ready to back out, I killed the cyr_expire by hand, and at that point imapd started responding and I was able to log in and see my own mail (which I know cyr_expire hadn't gotten to). It was a little slow to initially show my my mail, which suggests that maybe Cyrus was running cyr_expire or its equivalent after I authenticated and before showing my my inbox, but that led me to wonder whether it might be safe (when we repeat the migration) to kill the cyr_expire on initial startup so that Cyrus will start talking IMAP right away, and run it in the background. In case it matters, we have a bunch of emeritus users who occasionally check their mail at our site but don't use it on a day-to-day basis, and a bunch of users who forward their mail elsewhere and leave a copy on our IMAP server as a backup, and a lot of our heavy users are sophisticated enough not to leave all their mail in their inboxes so when we open the floodgates a very large fraction of that ~3TB is not going to be looked at immediately. Jay ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
