Hi, I have a small (3 users) Cyrus IMAP server that started as a very old Debian (Woody or Sarge, I don't remember exactly) and that I upgraded through the years, and yesterday I upgraded from Jessie to Stretch (Cyrus 2.4.17 without caldav, to 2.5.10 with caldav). As I had some trouble in the past with databases migrations between BerkeleyDB versions during some upgrades, and although Cyrus started without any serious problem this time (after minor tuning of some options in the configuration files), I still wanted to check the state of the databases. So, the contents of /usr/lib/cyrus/cyrus-db-types.txt is: ANNOTATION twoskip DBENGINE BerkeleyDB5.3 DUPLICATE twoskip MBOX twoskip PTS twoskip QUOTA quotalegacy SEEN twoskip STATUSCACHE twoskip SUBS flat TLS DEFAULT TLS twoskip USERDENY flat ZONEINFO twoskip (note that in Debian, no format is forced in /etc/imapd.conf) So my first questions is: I thought that Cyrus had abandoned BerkeleyDB a long time ago for skiplist, and then twoskip. Why is it still listed in this file ? Is there a part of Cyrus that still uses it ? Now for the databases themselves. In /var/lib/cyrus the global databases were converted on-the-fly: # file /var/lib/cyrus/*.db /var/lib/cyrus/annotations.db: Cyrus twoskip DB /var/lib/cyrus/deliver.db: Cyrus twoskip DB /var/lib/cyrus/mailboxes.db: Cyrus twoskip DB /var/lib/cyrus/statuscache.db: Cyrus twoskip DB /var/lib/cyrus/tls_sessions.db: Cyrus twoskip DB /var/lib/cyrus/user_deny.db: empty However, the user databases were not converted: # file /var/lib/cyrus/user/*/* /var/lib/cyrus/user/u/user1.seen: Cyrus skiplist DB /var/lib/cyrus/user/u/user1.sub: ASCII text /var/lib/cyrus/user/u/user2.seen: Cyrus skiplist DB /var/lib/cyrus/user/u/user2.sub: ASCII text /var/lib/cyrus/user/u/user3.seen: Cyrus skiplist DB /var/lib/cyrus/user/u/user3.sub: ASCII text So my next questions are: why are the databases still in skiplist format, whereas according to /usr/lib/cyrus/cyrus-db-types.txt, they should be twoskip ? Why didn't Cyrus convert them on-the-fly like the global databases ? Do I have to manually do it myself ? And if I do convert them, will it change anything (performance, reliability, etc etc) ? Also, what about the various databases in the mail directories (cyrus.cache, cyrus.header, cyrus.index) ? For most of them, the "file" command only reports "data". What format are they actually in ? Do I have to convert them too ? My last question is about a planned migration of this home server to a hosted private server. This old server and the new one are now both Debian Stretch and thus, have the same Cyrus version, but they're not the same architecture: the old one is i386, and the new one is amd64. When I mill migrate, will I have to convert the databases through the flat format and back, or can I blindly copy the whole contents of /var/spool/cyrus and /var/lib/cyrus to the new server and expect it to work out of the box ? Thanks a lot in advance for your answers. Regards, -- Raphaël Halimi
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