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From: "Austin S. Hemmelgarn" <ahferroin7@gmail.com>
To: Christoph Anton Mitterer <calestyo@scientia.net>,
	Sanidhya Solanki <jpage.lkml@gmail.com>
Cc: Qu Wenruo <quwenruo.btrfs@gmx.com>,
	David Sterba <dsterba@suse.cz>,
	jbacik@fb.com, linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size
Date: Tue, 12 Jan 2016 07:23:01 -0500	[thread overview]
Message-ID: <5694F025.1000800@gmail.com> (raw)
In-Reply-To: <1452527868.7801.2.camel@scientia.net>

On 2016-01-11 10:57, Christoph Anton Mitterer wrote:
> On Mon, 2016-01-11 at 06:49 -0500, Sanidhya Solanki wrote:
>> I considered that, but, if you read the specification of modern HDDs
>> carefully, it states that they are 4K or 512e sector size compatible,
>> hence the concession. Also, older drive users may find this
>> preferable.
> But these are powers of 2,... why does one need 768, 3072, 6144, etc.?
768 I don't know, the other two though would provide proper 
stripe-alignment on a 8 or 14 disk hardware RAID6 setup using 512 byte 
sectors (that is, one stripe in BTRFS would span the full array).

I personally think it should be restricted to multiples of 512, as that 
is the smallest sector size on any disk drive that is realistically 
usable with BTRFS.  That would also provide 4k support, and beyond that 
64k (which is where the really big drives are headed anyway), and also 
provide the ability to get proper stripe alignment on almost any 
hardware RAID configuration.


  parent reply	other threads:[~2016-01-12 12:23 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-28 12:24 [PATCH] BTRFS: Adds an option to select RAID Stripe size Sanidhya Solanki
2015-12-28 22:19 ` Christoph Anton Mitterer
2015-12-28 20:38   ` Sanidhya Solanki
2015-12-29  1:21     ` Christoph Anton Mitterer
2015-12-28 21:43       ` Sanidhya Solanki
2015-12-29  3:42         ` Christoph Anton Mitterer
2015-12-29  0:03           ` Sanidhya Solanki
2015-12-29  4:26             ` Christoph Anton Mitterer
2015-12-29  1:31               ` Sanidhya Solanki
2015-12-29  6:03                 ` Christoph Anton Mitterer
2015-12-29  2:23                   ` Sanidhya Solanki
2015-12-29 15:32                     ` Christoph Anton Mitterer
2015-12-29 16:44                       ` Duncan
2015-12-30  2:56                         ` Christoph Anton Mitterer
2015-12-29 18:06               ` David Sterba
2015-12-30 20:00                 ` Christoph Anton Mitterer
2015-12-30 21:02                   ` Duncan
2015-12-30 21:13                     ` Christoph Anton Mitterer
2016-01-02 11:52                 ` Sanidhya Solanki
2016-01-03  1:37                   ` Qu Wenruo
2016-01-03  2:26                     ` Christoph Anton Mitterer
2016-01-05 10:44                       ` David Sterba
2016-01-05 18:48                         ` Christoph Anton Mitterer
2016-01-10  3:11                     ` Sanidhya Solanki
2016-01-11  1:29                       ` Qu Wenruo
2016-01-11 15:43                       ` Christoph Anton Mitterer
2016-01-11 11:49                         ` Sanidhya Solanki
2016-01-11 15:57                           ` Christoph Anton Mitterer
2016-01-11 16:01                             ` Hugo Mills
2016-01-12 12:23                             ` Austin S. Hemmelgarn [this message]
2016-01-12 12:07                               ` Sanidhya Solanki
2015-12-29 13:39 ` David Sterba
2015-12-29 11:15   ` Sanidhya Solanki
2015-12-29 17:06     ` David Sterba
2015-12-29 21:32       ` Sanidhya Solanki
2015-12-30  6:39       ` Sanidhya Solanki
2015-12-30 11:59         ` Qu Wenruo
2015-12-30  9:54           ` Sanidhya Solanki
2015-12-30 14:10             ` Qu Wenruo
2015-12-30 11:15               ` Sanidhya Solanki
2015-12-30 15:58                 ` David Sterba
2015-12-30 21:19                   ` Sanidhya Solanki
2015-12-30 16:17               ` David Sterba
2015-12-30 21:21                 ` Sanidhya Solanki
2016-01-05 10:33                   ` David Sterba
2015-12-31  0:46                 ` Qu Wenruo
2016-01-05 10:16                   ` David Sterba
2015-12-30 19:48               ` Christoph Anton Mitterer

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