Hi Raphaël,
Answering below in blue for instance......
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El 14-02-2019 13:27, Raphaël Halimi escribió:
> 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 ?
>
> I SUPPOSE IT COULD SOME DEBIAN STANDARD CONFIG?. WE RUN FREEBSD AND I HAVE
> NEVER SEE THAT FILE.
>
> 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
>
> CYRUS 2.4 CONVERTED DATABASES ON THE FLY. CYRUS 2.5 AND NEWER DON'T. YOU
> SHOULD LAUNCH A "RECONSTRUCT -R -V MAX" FOR THAT PURPOSE.
>
> 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) ?
>
> AS SAID PERHAPS IS A DEBIAN DERIVED CONFIG FOR THE PACKAGE. YES YOU SHOULD
> WITH THE COMMAND ABOVE.
>
> 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 ?
>
> SURE... JUST LAUNCH A RECONSTRUCT -R -V MAX...
>
> 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 ?
>
> WHEN DOING SUCH A MIGRATION, IT WOULD BE BETTER TO SETUP A REPLICATION
> BETWEEN THE 2.4 AND THE NEW 2.5 IN THE HOSTING. YOU SHOULD ENCRYPT THAT
> COMMUNICATION. YOU COULD USE THE OWN CYRUS ENCRIPTION FOR REPLICATION OR
> SOMETHING LIKE OPENVPN. ALTHOUGH IT SHOULD WORK, I WOULDN'T COPY DIRECTLY
> (WITH AN RSYNC OR SCP) THE FILES.
>
> Thanks a lot in advance for your answers.
>
> Regards,
>
> CHEERS!
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