Question : Problem: Raid

What is better Raid 5 or Raid 10?

Answer : Problem: Raid

Hi!

For a system where no downtime is more important then HD speed, you might consider something like the following.

Clusterd servers, each with two scsi controllers.
Two external cabinets to wich both servers are connected.
The external cabinets both run RAID5 and are mirrored to each other. This will cost a bunch but 4 drives needs to fail at the same time, two in each cabinet in order for the need fo tape restore and for cluster to become unavailible either both computers need to fail at same time or all four scsi controllers. Any of theese scenarios is very unlikely to happen.

Or just a little safer you might even consider raid1+5 instead of 1+0.

If money is no object I would as suggested above recommend some sort of SAN and fibre channel.

Regards
/Hans - Erik Skyttberg