From: Stan Hoeppner <stan@hardwarefreak.com>
To: Joe Landman <joe.landman@gmail.com>,
Phillip Susi <psusi@ubuntu.com>,
joystick <joystick@shiftmail.org>
Cc: linux-raid <linux-raid@vger.kernel.org>
Subject: Re: The chunk size paradox
Date: Thu, 02 Jan 2014 16:42:42 -0600 [thread overview]
Message-ID: <52C5EB62.1090807@hardwarefreak.com> (raw)
In-Reply-To: <52C5BC28.2020003@gmail.com>
On 1/2/2014 1:21 PM, Joe Landman wrote:
> On 01/02/2014 01:02 PM, Stan Hoeppner wrote:
>> On 1/2/2014 10:31 AM, Phillip Susi wrote:
>>> On 1/2/2014 10:41 AM, Stan Hoeppner wrote:
>>>> First, there is no such thing as a 4K sector in Linux. Sectors are
>>>> 512 bytes. Filesystem blocks and memory pages are 4K.
>>>
>>> Of course there is. Disks with 4k sectors are becoming more and more
>>> popular.
>>
>> Please read: https://en.wikipedia.org/wiki/Advanced_Format
>>
>> There are no native 4K sector drives on the market. Linux does not
>
> Untrue.
>
> http://storage.toshiba.eu/cms/en/hdd/hard_disk_drives/product_detail.jsp?productid=452
From that page:
Physical parameters
Bytes/sector (Host) 512
Bytes/sector (Disk) 4096 kByte
>
> http://www.seagate.com/www-content/product-content/constellation-fam/constellation-cs/en-us/docs/terascale-hdd-data-sheet-ds1793-1-1306us.pdf
From that page:
Configuration
Heads/Disks 8/4
Bytes per Sector (512-byte emulation) 4096
Damn, you had me salivating Joe. These are both AF 512e drives, not
native 4K.
> and many others.
I've not yet seen an announcement from anyone. I'm not all seeing, but
I'd think such an announcement would cross my RADAR.
> 512 byte sector native drives are now far less common, with many of the
> drives being native 4096 bytes with a translation layer for legacy
> systems that require 512 bytes. This is infamous for wreaking havoc
> with alignment.
Exactly. Which is why so many of us wish native 4K drives would be
released. And, again, AFAIK, nobody is shipping a native drive.
They're all still 512e. I'd love for someone to prove me wrong here by
pointing one out that is available, preferably more than one.
--
Stan
next prev parent reply other threads:[~2014-01-02 22:42 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-30 18:48 The chunk size paradox Phillip Susi
2013-12-30 23:38 ` Peter Grandi
2013-12-31 0:01 ` Wolfgang Denk
2013-12-31 13:51 ` David Brown
2014-01-02 20:08 ` Phillip Susi
2014-01-02 14:49 ` joystick
2014-01-02 15:24 ` Phillip Susi
2014-01-02 15:41 ` Stan Hoeppner
2014-01-02 16:31 ` Phillip Susi
2014-01-02 18:02 ` Stan Hoeppner
2014-01-02 19:10 ` Phillip Susi
2014-01-02 22:49 ` Peter Grandi
2014-01-02 23:16 ` Stan Hoeppner
2014-01-03 1:02 ` Phillip Susi
2014-01-02 19:21 ` Joe Landman
2014-01-02 22:42 ` Stan Hoeppner [this message]
2014-01-02 22:56 ` Carsten Aulbert
2014-01-03 0:19 ` Phillip Susi
2014-01-03 1:24 ` Stan Hoeppner
2014-01-03 3:14 ` Joe Landman
2014-01-03 3:19 ` Stan Hoeppner
2014-01-03 4:24 ` Stan Hoeppner
2014-01-02 23:22 ` Peter Grandi
2014-01-03 3:09 ` Joe Landman
2014-01-03 4:58 ` Joe Landman
2014-01-02 22:32 ` Wolfgang Denk
2014-01-03 14:51 ` Benjamin ESTRABAUD
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