linux-ext4 - Re: How to use mkfs.ext4 "stride=" on RAID correctly?

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Message-ID: <yq1y6jy7gok.fsf@sermon.lab.mkp.net>
Date:	Sat, 16 Jan 2010 00:38:19 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Mike Mestnik <cheako@...i.com>
Cc:	Ric Wheeler <rwheeler@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: How to use mkfs.ext4 "stride=" on RAID correctly?

>>>>> "Mike" == Mike Mestnik <cheako@...i.com> writes:

>> Recent changes upstream export alignment and optimal IO size for you
>> (at least for software RAID/dm devices) and for some external arrays
>> if the vendor exports the information in a standard way.
>> 
Mike> Would this include eSATA DAS units?  Example: LaCie 4big Quadra

No.  Only SCSI devices report the necessary information.  There are no
comparable fields in ATA-ACS.

Mike> I can't discover or alter the IO size on this device and have not
Mike> received an answer from LaCie support.  They did say something to
Mike> the effect of "We don't have this information in our
Mike> documentation, so it must be I.P. that I can't disclose."

I.e. "we source this controller from a company in China and have no
idea".

-- 
Martin K. Petersen	Oracle Linux Engineering
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