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 Laurence on Tue 19th Jan 2010 10:20 UTC in reply to "RE: RAID Z"
Laurence
Member since:
2007-03-26


A. 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.

It's not the standard but it's a standard.
And while I agree with you that an agreed open standard for triple parity RAID is needed, there is at least already a file system available for use which supports such.
Plus at least said implementation is open source (even if it is patent encumbered)


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

What about FreeBSD or Linux (albeit via FUSE)?
Or how about one of the many other Solaris derived projects from pure Solaris to Nexenta (OpenSolaris plus debian user space tools)?

Besides - if you're business is large enough where triple parity RAID (or lack of) is a serious issue, then I'm sure they can either afford to run a dedicated *Solaris file server (even it's only virtualised) or learn how to run their additional tools on *Solaris.


C. 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?)

You're right, however OpenSolaris can boot for a ZFS mirror.

And why would you want to boot off your large data drives anyway?
It would make more sense to keep your OS separate from your production data.



Don't get me wrong, I'm not suggesting that there isn't a need for an official standard.
However I'm also saying don't be quick to dismiss ZFS just because it proprietary.

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