I've read various posts, threads and wiki articles on which RAID config to use for the ZCS server. Looks like RAID5 is not recommended for installs over 100 users. We have around 40 users right now and 60 would be our top end.
System is running ZCS NE 5.0.15, IMAP no POP. Average user account is 5GBs and current quota is 15GBs. We're an advertising/marketing agency and email usage and storage is very high. I'm currently planning for 20GB/account quota at 50 users so 1TB of available storage needed. The reality is many users will have less than 5GBs of mail storage.
Server is CentOS 5.2 on Dell PowerEdge 2850/2950 hardware. I'll be using 15K SAS drives throughout. Ok with RAID5 for mail store or is RAID 10 a better way to go? Will most likely put server OS onto RAID1 cfg w/ 73GB 15K SAS drives and keep /opt on the larger RAID.
Backups will be handled either via NFS or attached storage and not kept on the local RAID.
Do I need to spend the extra money to go for RAID 10 for a ~50 user configuration? It seems that my user storage is much higher than the normal ZCS setup I've seen.