Quick advise regarding Cyrus migration

[Roman Medina-Heigl Hernandez]

Thank you Bron. Then I will proceed simply by rsyncing dirs.

Cheers,
-r

Enviado desde mi dispositivo móvil.

> El 23/7/2016, a las 15:46, Bron Gondwana via Info-cyrus <info-cyrus at lists.andrew.cmu.edu> escribió:
> 
> 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
>> 
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> 
> 
> -- 
>  Bron Gondwana
>  brong at fastmail.fm
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