From: "H. Peter Anvin" <hpa@zytor.com>
To: David Brown <david.brown@hesbynett.no>
Cc: Mikael Abrahamsson <swmike@swm.pp.se>,
Kyle Brantley <kyle@averageurl.com>,
linux-raid@vger.kernel.org
Subject: Re: Issue with md and 4K sector alignment
Date: Thu, 06 Sep 2012 13:34:20 -0700 [thread overview]
Message-ID: <504908CC.2030400@zytor.com> (raw)
In-Reply-To: <5031E72B.8060002@hesbynett.no>
On 08/20/2012 12:28 AM, David Brown wrote:
>
> It would be nice if LVM and md moved towards a bigger native alignment.
> 4K is good enough for hard disks, but for SSD's you want to align
> partitions on erase block boundaries. The standard used by modern fdisk
> and gparted (and tools from the-OS-that-must-not-be-named) is 1 MB - a
> bigger alignment than is necessary for current SSDs, but one that will
> be good enough for the foreseeable future.
>
This is one advantage with superblock 1.0 -- the alignment of the
underlying device is preserved since the metadata is at the end.
-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:[~2012-09-06 20:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-19 21:06 Issue with md and 4K sector alignment Kyle Brantley
2012-08-20 5:36 ` Mikael Abrahamsson
2012-08-20 7:28 ` David Brown
2012-09-06 20:34 ` H. Peter Anvin [this message]
2012-09-07 6:19 ` Mikael Abrahamsson
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