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Date:      Wed, 10 Jul 2002 21:37:39 -0500 (CDT)
From:      User Boone <boone@bp6.adlistings.com>
To:        freebsd-stable@freebsd.org
Subject:   Re: strange ATA behavior with -STABLE
Message-ID:  <200207110237.g6B2bdk65338@bp6.adlistings.com>

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I've noticed a problem on two totally different machines with RAID1 ATA volumes
after the patch in -STABLE.  What I'm seeing is errors from the second drive
in the set, consisting of ad6 timeouts on READ and WRITE, followed by a    
controller reset.  The errors are very infrequent and occasional, and have
sometimes been followed by a kernel panic, though 99% of the time they just
log the error and go on.

I swapped out the second drive, and still had the problem.  I switched the
drives around, and the problem stayed with the second controller.

This is on two systems.  One is an SMP system with a Promise Fasttrak TX2 100
controller (its a dual P-III 1GHz box), the other is a different motherboard,
P3-700, and I'm using a CMD 646 chipset and was just letting the ATA driver
make a mirror (i.e. the motherboard BIOS has no idea the drives are mirrored).

I'm not using tagged queueing, and the only significant commonality with the
boxes is the presence of a RAID1 array.

Has anyone else seen this happening?

On a side note, I broke the mirrors on both boxes and made the drives standalone.  I then mounted the second drive on both and moved my relatively active mysql
database to the second controller (the second system is set up as a MySQL
replica of the first).  I've not seen one error since I got rid of the RAID1
arrays.

The drives on one system are IBM DTLA 15GB drives, and the other system is running Maxtor 60GB D740X U133 drives with the fluid bearings.

Hope these observations are of some assistance.

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