Originally Posted by jbinatl
And I would recommend Raid 6, as the space requirements of this type of array start to work against Raid 5 if and when you have a drive failure. There is a thread around here somewhere about it but basically the statistical failure rate of a hard drive measured in read/write access (in Raid 5) will be exceeded when performing a rebuild upon a single drive failure. This means that there is a high probability of a second drive failure during
the rebuild process, resulting in total data loss. That being said I currently have a 5TB array on Raid 5, which scares me to death. I will be migrating this over to a larger raid 6 array when time and resources permit. Good luck with your build.
I've never had an issue with a RAID 5 in the few years I've been using them. (and even with RAID 0 which I've been using since the late 90's)and certatainly the odds of having two drives fail at the same time are very remote.
I just figure if I haven't had a RAID 0 fail(which only takes one drive failure) in the 11 to 12 years I've been using them, the odds of two drives failing with my RAID 5 setups are even more remote.
Although I do back up my current RAID 0 setups regularly. But I don't make any backups of my RAID 5 setups. The RAID 5 setups are to large for me to back up any way. But my RAID 0 setups are two and three drive configs, with low capacity drives. So the RAID 0 sizes are under 1TB which are easy to backup since they are so small.