From: "H. Peter Anvin" <hpa@zytor.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Andreas Dilger <adilger@sun.com>, Karel Zak <kzak@redhat.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
util-linux-ng@vger.kernel.org
Subject: Re: [ANNOUNCE] util-linux-ng v2.17 (stable)
Date: Sun, 10 Jan 2010 23:27:10 -0800 [thread overview]
Message-ID: <4B4AD2CE.8040207@zytor.com> (raw)
In-Reply-To: <yq1ocl187ww.fsf@sermon.lab.mkp.net>
On 01/10/2010 10:36 PM, Martin K. Petersen wrote:
>>>>>> "Andreas" == Andreas Dilger <adilger@sun.com> writes:
>
> Andreas> I agree whole heartedly. We steer users very sharply away from
> Andreas> using partitions at all, because on h/w RAID devices the
> Andreas> 512-byte offset from fdisk completely kills RAID-5/6
> Andreas> performance.
>
> I don't have a problem aligning to 1MB (taking alignment_offset into
> account) by default but there needs to be an easy override. There are
> RAID arrays that internally compensate for the legacy 63 sector offset
> and we'll cause misalignment if we start at 1MB on those.
>
> I'm heavily lobbying our storage partners to make sure they fill out the
> right SCSI bits if their LUNs are not naturally aligned. But there are
> obviously going to be legacy devices out there that will need manual
> alignment compensation.
>
Yes, but we shouldn't default to braindead mode.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2010-01-11 7:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-08 9:33 [ANNOUNCE] util-linux-ng v2.17 (stable) Karel Zak
2010-01-08 21:43 ` H. Peter Anvin
2010-01-08 22:40 ` Andreas Dilger
2010-01-08 23:33 ` H. Peter Anvin
2010-01-11 6:36 ` Martin K. Petersen
2010-01-11 7:27 ` H. Peter Anvin [this message]
2010-01-11 14:05 ` Pavel Machek
2010-01-11 16:52 ` H. Peter Anvin
2010-01-11 20:17 ` Pavel Machek
2010-01-11 23:26 ` H. Peter Anvin
2010-01-12 13:33 ` Artem Bityutskiy
2010-01-12 13:35 ` Artem Bityutskiy
2010-01-11 19:17 ` Artem Bityutskiy
2010-01-12 7:19 ` Jörn Engel
2010-01-12 8:19 ` H. Peter Anvin
2010-01-12 9:37 ` Jörn Engel
2010-01-12 16:20 ` H. Peter Anvin
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