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To: Chris Murphy <lists@colorremedies.com>
Cc: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: btrfs on whole disk (no partitions)
From: "Martin K. Petersen" <martin.petersen@oracle.com>
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Date: Mon, 23 Jun 2014 07:34:38 -0400
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	Murphy's message of "Sun, 22 Jun 2014 12:31:44 -0600")
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>>>>> "Chris" == Chris Murphy <lists@colorremedies.com> writes:

Chris> Does anyone know if blktrace will intercept the actual SCSI
Chris> commands sent to the drive? Or is there a better utility to use
Chris> for this? When I use it unfiltered, I'm not seeing SCSI write
Chris> commands at all.

# echo scsi:scsi_dispatch_cmd_start > /sys/kernel/debug/tracing/set_event 
# echo 1 > /sys/kernel/debug/tracing/tracing_on
[do stuff]
# cat /sys/kernel/debug/tracing/trace

-- 
Martin K. Petersen	Oracle Linux Engineering