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[2]: RAID Z
by computeruser on Mon 18th Jan 2010 23:52 UTC in reply to "RE: RAID Z"
computeruser
Member since:
2009-07-21

ZFS is not a standard (unlike, say RAID6). It's an implementation. Far worse, it's a patent encumbered implementation of a triple parity RAID level.

There is no standard detailing RAID-6, just a widely accepted definition.

ZFS happens to implement something with similar redundancy characteristics to RAID-5 and RAID-6 and also implements triple parity.

You'll amazed to hear that most of the world doesn't use OpenSolaris.

So? That doesn't change that OpenSolaris supports triple parity right now. Since OpenSolaris has networking support, including CIFS, iSCSI, and NFS serving, it can still be useful to those who don't currently use OpenSolaris.

As far as I remember, OpenSolaris' modified grub cannot boot from ZFS RAID. (And nothing beats losing your boot record + kernel on a production machine, right?)

ZFS is not the only way to provide redundancy for a boot partition.

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