Linked by Thom Holwerda on Fri 18th Sep 2009 13:40 UTC, submitted by Robert Escue
Hardware, Embedded Systems This is an article which discusses the increase in storage capacity while performance and hard error rates have not improved significantly in years, and what this means for protecting data in large storage systems. "The concept of parity-based RAID (levels 3, 5 and 6) is now pretty old in technological terms, and the technology's limitations will become pretty clear in the not-too-distant future " and are probably obvious to some users already. In my opinion, RAID-6 is a reliability Band Aid for RAID-5, and going from one parity drive to two is simply delaying the inevitable."
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Bounty
Member since:
2006-09-18

8x 300$ 300GB SAS drives = 2400$ for 2TB Raid setup
v.s.
3x 80$ 1TB SATA drives = 240$ for a 2TB Raid setup

So you basically still have to work out your solution to meet a specific projects needs between speed, security etc. I could double the # of SATA drives for RAID 10 and still be waaaaay under the cost of the SAS solution. Might not even need another box to hold the drives. I think array performance is a bigger factor when making a decision because the cost to be overly redundant with SATA is still waaaay cheap.

Reply Score: 2

werfu Member since:
2005-09-15

You're right on the price, but there is one point where the SAS drives win: 8x10k SAS drive is way more faster than 3x any 1TB SATA drive available on the market. And even not taking the hard drive rotation speed into consideration, SAS is more efficient than SATA.

Reply Parent Score: 1

bannor99 Member since:
2005-09-15

Whether you keep SAS interfaces or switch to SATA, the real issue here is the reliability of hard disks.

Solid state disks should and will be the solution.

Reply Parent Score: 1

Robert Escue Member since:
2005-07-08

And what are you using for the disk controller, the enclosure, the filesystem? All of these play a role in the performance and reliability of a storage solution.

If this is something you are going to cook up for home is one thing, if you are putting this together for a customer, its not a road I would go down.

Reply Parent Score: 2