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Re: RAID stripe size (was: 5.1 RAID5 write performance)
Hello. I like this explanation. Can you help clarify by giving a
On Jun 6, 9:50am, Thor Lancelot Simon wrote:
} Subject: Re: RAID stripe size (was: 5.1 RAID5 write performance)
} On Mon, Jun 06, 2011 at 03:24:15PM +0200, Edgar Fu? wrote:
} > > Ah, yes, the old
cycle. Gets me every time.
} > OK, I've fixed that (before doing the tests I reported the last two days).
} > So, what's the advantage of a larger sectPerSU?
} > It appears to me that the raidctl manpage should note that
} > -- the stripe size should match fsbsize
} Wait. I didn't notice this until just now. This is not right.
} The filesystem block size (or, where this is not possible, the maximum
} cluster size the filesystem will write) should be equal to sectPerSU
} times the number of data (not parity) disks. The sectPerSU value is
} the *per-component* stripe size, not the total amount of data written
} across all components in one stripe.
>-- End of excerpt from Thor Lancelot Simon
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