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[3]: What about 5-way RAID?
by CodeMonkey on Tue 19th Jan 2010 16:37 UTC in reply to "RE[2]: What about 5-way RAID?"
CodeMonkey
Member since:
2005-09-22

RAID 10 can only reliably survive the loss of one drive.


Since it's a stripe of mirrors you can lose all but one drive in each mirror set.


Really you're both right. Best case catastrophic loss: You loose 50% of all your drives, but it's only 1 drive out of each mirror so everything is still fine. Worst case catastrophic loss: You loose both drives in a single mirror and the entire striped array is toast. So you could loose up to 50% of the drives and still be okay or you could loose 2 and be screwed.

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