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raidframe and ffs block size interaction

To: netbsd-users%NetBSD.org@localhost
Subject: raidframe and ffs block size interaction
From: "Jonathan A. Kollasch" <jakllsch%kollasch.net@localhost>
Date: Tue, 27 Sep 2011 14:19:56 -0500

How do you get maximum performance out of a RAID-1 raid(1) and still use
2KiB or 4KiB FFS frag sizes?  The misalignment of some FFS cylinder
groups causes many accesses to be split when the recon unit is 64KiB.

I don't consider using 16KiB or 32KiB recon units or 8k frags a solution.

        Jonathan Kollasch

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