Replication verification

[Vladimir Klejch]

On Fri, 27 Jun 2008, David Carter wrote:

> On Fri, 27 Jun 2008, Vladimir Klejch wrote:
>
>> I searchig for a  posibility to  use both server's in production as
>> master-master.
>
> Afraid that replication in Cyrus doesn't support full master-master, only
> master/slave. UIDs in IMAP make full master-master rather involved. It is
> possible to run a mix of master and replica mailstores on a single system.

It's not really full master-master. I configured both servers as 
master/slave in cross, with different sync_machineid ( for UID computation 
)  and guid_mode: sha1.

I tested this scenario, and it's working great. Changes on one server are 
replicated to the other one, and this in both directions.



>
>> There are tools like nake_md5 and make_sha1, but the manpages document
>> only howto config them, but not how to realy use them for replication
>> check.
>
> I download the md5 files to a single location and run a 50 line Perl
> script to spot mismatches. You are welcome to a copy of that script.

Yeah ... cann you mail me a copy for inspiration ?? Thanks.

>
> To make sure that the replica is up to date I run sync_client in an extra
> verbose mode (-v -v) and check for unexpected updates. Unfortunately that
> code didn't make it it into the vanilla Cyrus tree because of the
> reorganisation required to run sync_server from master using prot streams
> for communication. It wouldn't take a huge amount of effort to add "-v -v"
> into standard Cyrus.

it would by nice to have methods to check replication in the mainstream. 
:-))

>
> I believe that Fastmail have an external test suite which does spot checks
> on the master and replica versions of each account. This is the opposite
> approach, and makes sense if you have a convenient IMAP client library.
>

I think, that only spot check are good for quick replication test, but not 
for verification of replication status.



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Vladimir `KLEO' Klejch     	Kleo'at'netbox.cz
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