From: Tobias McNulty <tobias@caktusgroup.com>
To: Stan Hoeppner <stan@hardwarefreak.com>
Cc: Brad Campbell <lists2009@fnarfbargle.com>, linux-raid@vger.kernel.org
Subject: Re: HBA Adaptor advice
Date: Sun, 22 May 2011 16:57:37 -0400 [thread overview]
Message-ID: <BANLkTi=az3ny5m7Mf20t5fnFj79CsowJWg@mail.gmail.com> (raw)
In-Reply-To: <4DD9633E.5000101@hardwarefreak.com>
On Sun, May 22, 2011 at 3:25 PM, Stan Hoeppner <stan@hardwarefreak.com> wrote:
>
> On 5/22/2011 5:09 AM, Brad Campbell wrote:
> > On 22/05/11 17:04, Stan Hoeppner wrote:
> >> It's difficult to align partitions properly on the Green drives due to
> >> native 4K sectors translated by drive firmware to 512B sectors. The
> >> Seagate SAS drive has native 512B sectors.
> >
> > Actually it's not difficult at all. You just make sure all your
> > partitions start on an even multiple of 8 sectors. No magic in it. Just
> > the same as all my SSD partitions start on 512k boundaries.
>
> IIRC from discussions here, mdadm has alignment issues with hybrid
> sector size drives when assembling raw disks. Not everyone assembles
> their md devices from partitions. Many assemble raw devices.
Case in point: I have 4 of these 2TB Green drives in a RAID5 array. I
assembled them from the raw devices (no partition table) without any
special precautions. Am I in trouble? The array seems to be working
fine...
Tobias
--
Tobias McNulty, Managing Member
Caktus Consulting Group, LLC
http://www.caktusgroup.com
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next prev parent reply other threads:[~2011-05-22 20:57 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-19 12:26 HBA Adaptor advice Ed W
2011-05-19 12:36 ` Roman Mamedov
2011-05-19 12:43 ` Mathias Burén
2011-05-19 14:06 ` Michael Sallaway
2011-05-19 19:10 ` Thomas Harold
2011-05-19 21:12 ` Rudy Zijlstra
2011-05-19 21:07 ` Brad Campbell
2011-05-20 20:58 ` Tobias McNulty
2011-05-20 21:23 ` Brad Campbell
2011-05-20 2:08 ` Andy Smith
2011-05-20 5:30 ` Stan Hoeppner
2011-05-21 9:52 ` Ed W
2011-05-20 7:33 ` Ed W
2011-05-20 10:21 ` Stan Hoeppner
2011-05-21 11:17 ` Ed W
2011-05-21 11:29 ` Rudy Zijlstra
2011-05-21 11:54 ` Ed W
2011-05-21 17:37 ` Leslie Rhorer
2011-05-22 9:41 ` Stan Hoeppner
2011-05-22 10:03 ` Rudy Zijlstra
2011-05-23 9:32 ` Ed W
2011-05-21 17:05 ` Leslie Rhorer
2011-05-22 9:04 ` Stan Hoeppner
2011-05-22 10:09 ` Brad Campbell
2011-05-22 19:25 ` Stan Hoeppner
2011-05-22 20:57 ` Tobias McNulty [this message]
2011-05-22 21:13 ` Johannes Truschnigg
2011-05-23 9:48 ` Ed W
2011-05-23 10:44 ` John Robinson
2011-05-22 23:19 ` Brad Campbell
2011-05-23 4:09 ` Roman Mamedov
2011-05-23 5:54 ` Brad Campbell
2011-05-23 6:08 ` Roman Mamedov
2011-05-23 10:42 ` Stan Hoeppner
2011-05-23 11:35 ` David Brown
2011-05-23 6:54 ` Stan Hoeppner
2011-05-23 7:23 ` Brad Campbell
2011-05-22 23:44 ` Brad Campbell
2011-05-23 0:07 ` Brad Campbell
2011-05-23 5:30 ` Stefan /*St0fF*/ Hübner
2011-05-23 10:18 ` Ed W
2011-05-23 9:58 ` Stan Hoeppner
2011-05-23 10:33 ` Ed W
2011-05-23 11:21 ` Stan Hoeppner
2011-05-20 12:18 ` Joe Landman
2011-05-20 12:34 ` Roman Mamedov
2011-05-20 12:36 ` Mathias Burén
2011-05-20 12:48 ` Joe Landman
2011-05-20 13:21 ` Ed W
2011-05-20 14:23 ` Joe Landman
2011-05-20 20:01 ` Andy Smith
2011-05-20 20:12 ` Stan Hoeppner
2011-05-20 20:24 ` Drew
2011-05-20 20:58 ` Stan Hoeppner
[not found] ` <4DD7A100.2010807@wildgooses.com>
2011-05-22 8:13 ` Stan Hoeppner
-- strict thread matches above, loose matches on Subject: below --
2011-05-23 2:11 Jim Schatzman
2011-05-23 3:39 ` Tobias McNulty
2011-05-23 10:42 ` Ed W
2011-05-23 11:14 HBA Adaptor Advice Ed W
2011-05-23 11:55 ` Joe Landman
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