depends on what RAID lvl are u running?
Raid 0 does not provide any redundancy at all-so if one hard drive fail--you data are gone.
Raid 1 offer basic mirroring that does provide some data redundancy with a little overhead.
SCSI RAID5 is the best you can get for data security and redundancy. And also the most expensive setup. The card itself is costing more than $1000 bucks to start with (i think).
There are several SCSI cards that will cost between $400-700 so $100 is a bit more high end than needed on a home workstation or any average system. I'm sure if you look in the FS forums you can find some cheaper sometimes as well.
i think there are some ide raid4 or 5 card. I think they are as reliable as scsi -but maybe dont have throughput like the espensive scsi raid.
For non-critical site--any setup will do imho. Raid 1 will be minimum i think for hosting kindda environment.
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