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Subject: ACK/NAK timeout
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Hi,

I have the following config:

1. DG43GT motherboard with 4GB memory
2. br10i SAS adapter
3. 16x Toshiba SAS drives connected to expander backplane.

I am able to create a zfs pool ok without any errors but as soon as I
do a scrub on that pool I get tons of scsi errors.

Here is my dmesg output:

http://pastebin.com/81AUsG6q

(da3:mpt0:0:12:0): READ(6). CDB: 8 0 b2 f1 6f 0
(da3:mpt0:0:12:0): CAM status: SCSI Status Error
(da3:mpt0:0:12:0): SCSI status: Check Condition
(da3:mpt0:0:12:0): SCSI sense: ABORTED COMMAND asc:4b,3 (ACK/NAK timeout)

I have a similar setup with desktop SATA drives and I see no issues.

I have tried replacing motherboard and SAS adapter but no luck.

I have already tried following in my loader.conf

hw.pci.enable_msix="0"
hw.pci.enable_msi="0"


Any help would be appreciated.

Thanks.