Skiplist should be clean for a 32 bit to 64 bit architecture change. It's all very type-careful internally. It's also endian-change safe, because it uses network-byte-order for everything internally. We definitely did a 32 bit to 64 bit conversion (probably slightly earlier - Debian 6 to 7) at FastMail, and we didn't have any problems. Regards, Bron. On Sat, Jul 23, 2016, at 20:18, Roman Medina-Heigl Hernandez via Info-cyrus wrote: > Hi guys, > > I'm running Cyrus Imap 2.4.16 on Debian 7 (x86) 32 bits and I need to > migrate to 2.4.17(nocaldav) on Debian 8 (x86) ** 64 bits **. > > I've been reading some articles (like this one, which is 6 years old: > https://cynici.wordpress.com/2010/12/06/how-to-migrate-32-bit-cyrus-imapd-mailboxes-to-64-bit/ > ). > > My question is: is it really needed to convert .db from skiplist to > flag, and then back to skiplist , as suggested by many articles? (or > even rebuild mailboxes like in last pointed article). Both machines are > x86, being the only difference 32 vs 64 bits (endianness is same, etc). > > I did a quick test simulating the migration, by simply just copying > /var/lib/imap, /var/spool/mail and /var/spool/sieve. It seems it worked > fine (or at least I couldn't find any problem when running imap with the > migrated data). But I'd need your confirmation this should be sufficient > and I won't find problems in the future. > > I also played with db conversions (skiplist -> flat -> skiplist) and I > have some questions: > - I converted annotations.db (skiplist) to flat and then back to > skiplist. It passed from 11K to 144 bytes (both skiplist)!!! Is it normal? > - I did same exercise obtaining new skiplist db in both machines from a > same flat. I got a vey similar (but not exactly the same) result .db in > both 32 & 64 bits (some minor bytes may change but it didn't seem like > big differences/changes). Maybe some different metadata (I mean not > important), or I should concern about it? > - apart from .db's from /var/lib/imap, should I worry about other > skiplist like .seen files in /var/spool/mail? > > Sorry if there are too much questions but this migration is important, I > cannot loose any data (email data + email metadata: read marks, etc). > > Please, advise! > > Thank you so much in advance and have a nice day! > > -- > Saludos, > -Román > > ---- > 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 -- Bron Gondwana brong@xxxxxxxxxxx ---- 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
