linux-kernel - Re: ATA 4 KiB sector issues.

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Date:	Wed, 17 Mar 2010 01:01:55 -0700
From:	"jdow" <jdow@...thlink.net>
To:	"Tejun Heo" <tj@...nel.org>, "Kevin Easton" <caf@...rana.org>
Cc:	"James Bottomley" <James.Bottomley@...e.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: ATA 4 KiB sector issues.

From: "Tejun Heo" <tj@...nel.org>
Sent: Tuesday, 2010/March/16 20:44


> Hello,
> 
> On 03/17/2010 11:51 AM, Kevin Easton wrote:
>> Can't we fix the problem by defaulting to aligning partitions to
>> start on an LBA that is a multiple of 64260 ?
>> 
>> Such partitions will always be 4KiB-aligned, *and* start-of-cylinder
>> aligned (assuming 255/63, as seems to be the norm).
>> 
>> Sure, that reduces your partition granularity to almost-32-MiB, but
>> that's pretty small potatoes these days (and it's only a *default*, so
>> you could always override that if you really cared, and didn't need 
>> the compatibility).
> 
> The only thing we can gain by that is possible compatibility w/ very
> old operating systems (<=w2k, BTW, it would be great if someone can
> actually test it).  Plus, breaking the first cylinder assumption might
> not be always safe to begin with.  I personally don't think it's
> something worth departing from the behavior most vendors would assume
> from now on (1MiB alignment).  It should be enough and safer to
> provide a mechanism to choose legacy alignment if someone is trying to
> put something which is older than a decade there.
> 
> Thanks.
> 
> -- 
> tejun

WRT very old filesystems - it won't affect Amiga partition tables or
the Amiga FFS. It already understands large block sizes natively. And
that's MY definition of "old" with "very" in front of it.

{^_^}   Joanne Dow
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