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Date:      Thu, 10 Apr 2014 11:27:12 +0200
From:      Dirk-Willem van Gulik <dirkx@webweaving.org>
To:        freebsd-hackers@freebsd.org
Subject:   Hardware raid v.s. 'soft errors'
Message-ID:  <FF1DB9B2-7B90-4102-81B6-3F4251B7043B@webweaving.org>

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Got two AAC hardware raid machines - slightly differently configured. =
Both are (about once every other year) giving an error like

	g_vfs_done():aacd1p8[READ(offset=3D1757508976640, =
length=3D65536)]error =3D 5

while the hardware raid is healthy - and passes all its validations. As =
do the disks (we=92ve replaced disks on those machines some 4 or
5 times - with no real impact/change - still above issue every 18 months =
or so) As far as I can trace this through the kernel - these
errors *really* come from the ATA in the AAC - correct ?

The odd thing is that it happens on two machines - with slightly =
different AAC cards; and with a different upgrade history. Both are now
9.2-RELEASE-p3 - but the issue has propagated from 7.2 upward.

Any suggestions as to where to look ? And specifically - is there a way =
in the AAC to intercept events/errors at an even lower level ? Or
should I be assuming this to be more in raid card firmware territory ?

Dw=



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