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From: Ed W <lists@wildgooses.com>
To: Johannes Truschnigg <johannes@truschnigg.info>
Cc: Tobias McNulty <tobias@caktusgroup.com>, linux-raid@vger.kernel.org
Subject: Re: HBA Adaptor advice
Date: Mon, 23 May 2011 10:48:39 +0100	[thread overview]
Message-ID: <4DDA2D77.1050604@wildgooses.com> (raw)
In-Reply-To: <4DD97C83.4050907@truschnigg.info>

On 22/05/2011 22:13, Johannes Truschnigg wrote:
> On 05/22/2011 10:57 PM, Tobias McNulty wrote:
>> 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...
> 
> No, you aren't. If you don't create a partition table in the first
> place, there's no possibility for partition boundaries to be mis-aligned
> in regard to the physical sector or erase block size of the underlying
> blockdevice. You could probably still get it wrong if you chose (if

Pardon what is probably a very ignorant question, but someone earlier in
this thread claimed that some adaptors report the size of the disk
slightly differently?  Wouldn't this potentially cause problems if you
needed to move the disks to a different controller?

Additionally if you needed to replace the disk then some new batch might
be some few sectors smaller?  This seems to be the biggest reason for
wanting to add a partition table and then deliberately partition some
10s MB smaller? (Think I saw this exact problem come up several times in
the last few weeks alone?)

Cheers

Ed W

  reply	other threads:[~2011-05-23  9:48 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
2011-05-22 21:13                 ` Johannes Truschnigg
2011-05-23  9:48                   ` Ed W [this message]
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
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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