RAID type suggestion

[Rob Mueller]

Just some thoughts

1. Simon is right about RAID-5 being unreliable. Either use RAID-6 or 
replication to a completely separate system to ensure you have enough 
redundancy
2. Look at having separate RAID-1 for OS AND cyrus meta data, and 
RAID-5+replication or RAID-6 for the data spool

>From our testing, if you separate out the cyrus meta data (eg mailboxes.db, 
quota dbs, cyrus.* files, etc), it gets more IO than the email spool data, 
but takes only 1/20th the storage, so having high speed (eg SAS, 10k RPM 
drives, etc) for it is definitely worthwhile.

Rob