linux-kernel - Re: absurdly high "optimal_io

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Message-ID: <yq1389u95wu.fsf@sermon.lab.mkp.net>
Date:	Fri, 07 Nov 2014 14:17:37 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Chris Friesen <chris.friesen@...driver.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	lkml <linux-kernel@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>, Mike Snitzer <snitzer@...hat.com>
Subject: Re: absurdly high "optimal_io_size" on Seagate SAS disk

>>>>> "Chris" == Chris Friesen <chris.friesen@...driver.com> writes:

Chris> Apparently the "hdparm -I" command is giving bogus data as well.
Chris> I've seen that happen if the drive is on a RAID controller--I
Chris> assume that could cause problems with firmware updates too?

I'd suggest trying /dev/sgN instead.

But yes, some RAID controllers require you to use their tooling and
won't allow direct passthrough.

-- 
Martin K. Petersen	Oracle Linux Engineering
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