Upgrading cyrus

[Benjamin Seidenberg]

On 09/15/2010 12:07 PM, Jeroen van Meeuwen (Kolab Systems) wrote:
> Patrick Goetz wrote:
>   
>> On 09/14/2010 04:16 PM, Jeroen van Meeuwen (Kolab Systems) wrote:
>>     
>>> Indeed it [cyrus-imapd.cvt_cyrusdb_all] exports the databases on service
>>> shutdown, and then imports them back on service startup; noted that a
>>> condrestart happens on the RPM update, this about covers every thinkable
>>> scenario (or at least those I've had in the past 7 years).
>>>       
>> This seems like it would considerably slow down startup/shutdown on
>> systems with large databases....
>>
>>     
> A spool with 179GB (du -sh, ext3 4k), takes 30 seconds to export and 12 
> seconds to import, noted that this is not the only thing the machine is doing. 
> No raid whatsoever.
>   

I would think the time to do this would be more a function of how many
users are keeping mail in the mail-store than of the amount of spaced
used, given that there are a lot of per-user dbs.

TL;DR version: A bunch of users without much mail might be slower than a
few users with a ton of mail, regardless of how much disk space is consumed.