Farkas Levente wrote:
hi,
what's the current recommended superblock to use for a newly created
raid5-6 array with 6 pieces of 1tb disk? by default mdamd use 0.90. is
it worth to change it to any 1.x format?
anyway is there any advantage of a raid6 over raid5+1spare disk? afaik
raid5 will be faster and use less cpu and both case 2 disk can failed.
thanks in advance.
Let me be Devil's Advocate. The advantage of raid6 is that it will
survive the failure of two drives at the same time, while a spare must
be rebuilt (a good argument for fast rebuild and let response go to blazes).
The advantage of raid5+S is that with a failure of a single drive you
run your io in recovery mode, and it is slow, while after rebuild on the
spare raid5+S is as fast as ever.
I have been trying some things with raid5e, and as soon as I find a good
primer on using events to kick the recovery off I will be able to report
some sucess with this. My POC uses a script, and works fine if I poll to
detect the disk failure.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
"You are disgraced professional losers. And by the way, give us our money back."
- Representative Earl Pomeroy, Democrat of North Dakota
on the A.I.G. executives who were paid bonuses after a federal bailout.
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