Linked by Thom Holwerda on Mon 18th Jan 2010 16:57 UTC, submitted by wanker90210
Hardware, Embedded Systems ACM's latest journal had an interesting article about RAID which suggested it might be time for triple parity raid. "How much longer will current RAID techniques persevere? The RAID levels were codified in the late 1980s; double-parity RAID, known as RAID-6, is the current standard for high-availability, space-efficient storage. The incredible growth of hard-drive capacities, however, could impose serious limitations on the reliability even of RAID-6 systems. Recent trends in hard drives show that triple-parity RAID must soon become pervasive."
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RE: What about 5-way RAID?
by gilboa on Mon 18th Jan 2010 23:09 UTC in reply to "What about 5-way RAID?"
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seriously at some point it just makes more sense to standardize on RAID 10 doesn't it?

You're wrong.
A. A theoretical RAID7 running only wastes 3 drives - no matter how many drives you have. (15% in 20 drive array). RAID 10 will -always- waste at-least 50% of the space.
B. RAID7 can reliably survive the loss of 3 drives. RAID 10 can only reliably survive the loss of one drive. If you lose two (a full mirror), you lose everything. (The top level strip set is lost)

- Gilboa

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