high-availability again

[zorg]

Hi
I'v seen in the list lot of discussion about availabity but none of them seem to give a complete answers

I have been asked to build an high-availability for 5000 users

I was wondering what is actually the best solution

Using murder 
Idon' t really understand if it can help me. it's purpose is for load balancing.
but some people on this list seem to use it for availabily like this 

- Server A
  - active accounts 1-100
  - replicate accounts 101-200 from Server B
- Server B
  - active accounts 101-200
 - replicate accounts 1-100 from Server A
If B goes down, A takes over the accounts it had
replicated from B.

if someone can explain the detail of this conf ?
 - the tool use to replicate ?
 - what configuration of the MUPDATE make it to switch the user to server A from B ??



Replication with rsync
see to slow the 5000  user

Cluster with block device
 but if you have a heavily corrupted filesystem. yau are stuck. and recovery can be long

Using a SAN : 
Connect your two servers to a SAN, and store all of
Cyrus' data on one LUN, which both servers have access to.  Then, set
your cluster software to automatically mount the file system before
starting Cyrus.
but if you have a heavily corrupted filesystem. yau are stuck. and recovery can be long



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