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Date:      Tue, 21 Jul 1998 13:48:08 +0200 (MET DST)
From:      Willem Jan  Withagen <wjw@surf.IAE.nl>
To:        karl@mcs.net
Cc:        scsi@FreeBSD.ORG
Subject:   Re: AHC errors under load.
Message-ID:  <199807211148.NAA05663@surf.IAE.nl>
In-Reply-To: <19980720175223.53615@mcs.net>
References:  <199807202153.VAA16546@digi.digiware.nl>

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In article <19980720175223.53615@mcs.net> you write:
>This is VERY bad.  You now have trash in at least one file (if you're
>lucky), or a wrecked directory structure (if you're unlucky).
>
>Find the cause.  
>
>Like immediately.  
>
>Termination problems can cause this problem, and it should be treated with
>EXTREME severity.

Well it's not that serious, since I was only running bonnie and iozone
on that volume, as part of a stress-test.
I guess it failed.

You say termination? Could it be funcky firmware?

But I'm still wondering what the messages mean??
Is it because a device did not respond? Did the controller forget about
things? .....

--WjW

>> I got the message below, some more junk, and then the AHC resets the bus.
>> But the system is still up and running.
>> First time I eve see this.
>> Can anybody explain what happened?

>> 
>> hobby kernel log messages:
>> > sd2(ahc0:9:0): data overrun of 16777215 bytes detected in Data-Out phase.  Tag == 0x9.  Forcing a retry.
>> > sd2(ahc0:9:0): Have seen Data Phase.  Length = 65536.  NumSGs = 15.
>> > sg[0] - Addr 0x3326000 : Length 4096
>> > sg[1] - Addr 0x627000 : Length 8192
>> > sg[2] - Addr 0x3ea9000 : Length 4096
>> > sg[3] - Addr 0x3baa000 : Length 4096
>> > sg[4] - Addr 0x206b000 : Length 4096
>> > sg[5] - Addr 0x242c000 : Length 4096
>> > sg[6] - Addr 0x396d000 : Length 4096


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