RAID 6 vs 10
Posted on 2011-03-07
Hello experts, I need some advice. I have done some research on the different RAID configurations, but would like your advice for my specific situation. First - some background: Due to a bad batch of hard drives (I can only assume) I have suffered 3 catastrophic failures of RAID 5 arrays in the last 18 months, so I am kinda jumpy when it comes to my servers dropping their RAID array.
I am in the position where I am preparing to rebuild a server that will be my organization's main storage server. This server will have Windows Server 2008 on a separate (RAID 1) array. This server will ONLY be a storage server - no other services will be running on it. I have about 200 "heavy" users that access the files frequently and another 1500 "light" users that only access files occasionally. My server has six 500GB hard drives available - storage capacity is not as big a concern as reliability, but I do have about 850GB of data to store (at this point in time).
Which RAID configuration should I use. From what I have read I see the following options:
- RAID 10 (4 drives in the array, 2 hot spares): I could lose 1 drive, and maybe 2 (depending on which drives failed) at the same time. Performance would be best
- RAID 6 (5 drives in the array, 1 hot spare): I could lose 2 drives at the same time - regardless of which drives fail, but performance would be decreased. I would also have more capacity.
I am also open to other suggestions. Thank you.