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Date: Sun, 19 Aug 2007 21:41:47 -0400
From: Howard Goldstein <hg@queue.to>
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Subject: Re: graid5, 3 consumers, unaligned access
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Howard Goldstein wrote:
> Due to a bug in the twe driver I've noticed quite a few accesses to the
> graid5 consumer that aren't on 512 byte boundaries.  These are all 3
> identical drives with identical geometries.  The unaligned accesses

Identical geometries as far as fdisk thought, but not geom.  Could this
be the problem?  twed0 is the device that has an issue with unaligned access

cally:/usr/src/sys/geom/raid5$ geom disk list
Geom name: ad5
Providers:
1. Name: ad5
   Mediasize: 163928604672 (153G)
   Sectorsize: 512
   Mode: r1w1e3
   fwsectors: 63
   fwheads: 16

Geom name: ad8
Providers:
1. Name: ad8
   Mediasize: 320072933376 (298G)
   Sectorsize: 512
   Mode: r6w6e9
   fwsectors: 63
   fwheads: 16

Geom name: ad10
Providers:
1. Name: ad10
   Mediasize: 320072933376 (298G)
   Sectorsize: 512
   Mode: r6w6e9
   fwsectors: 63
   fwheads: 16

Geom name: twed0
Providers:
1. Name: twed0
   Mediasize: 320072933376 (298G)
   Sectorsize: 512
   Mode: r4w4e6
   fwsectors: 63
   fwheads: 255