Received: (at 15056) by debbugs.gnu.org; 9 Aug 2013 04:53:41 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Aug 09 00:53:41 2013 Received: from localhost ([127.0.0.1]:48539 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1V7eho-0001by-OB for submit <at> debbugs.gnu.org; Fri, 09 Aug 2013 00:53:41 -0400 Received: from mail2.vodafone.ie ([213.233.128.44]:30443) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <P@HIDDEN>) id 1V7ehn-0001bl-1P for 15056 <at> debbugs.gnu.org; Fri, 09 Aug 2013 00:53:39 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApMBANN0BFJtTdNT/2dsb2JhbAANTr9mgnWBL4MYAQEBBDIBRhALDQEKCRYPCQMCAQIBRQYNAQcBAa51khiQGweEDgOeKoNpiHyBOg Received: from unknown (HELO [192.168.1.79]) ([109.77.211.83]) by mail2.vodafone.ie with ESMTP; 09 Aug 2013 05:53:33 +0100 Message-ID: <520475CC.2050505@HIDDEN> Date: Fri, 09 Aug 2013 05:53:32 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= <P@HIDDEN> User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: Filipus Klutiero <chealer@HIDDEN> Subject: Re: bug#15056: Please indicate the meaning of block sizes in filesystem information References: <5204717E.1090606@HIDDEN> In-Reply-To: <5204717E.1090606@HIDDEN> X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 15056 Cc: 15056 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: 0.0 (/) On 08/09/2013 05:35 AM, Filipus Klutiero wrote: > Severity: wishlist > > stat -f provides information on the filesystem, including block sizes: >> Block size: 4096 Fundamental block size: 4096 > The unit used in unfortunately not specified. Considering the fdisk output I get... >> Sector size (logical/physical): 512 bytes / 512 bytes >> I/O size (minimum/optimal): 512 bytes / 512 bytes > ... I guess bits are the unit. always bytes There are generally 3 layers of block sizes between the file system and device: 1. physical defined by the hardware device 2. logical the smallest addressable unit used for the device 3. file system ditto for the file system So your numbers above are not the same item being represented. They're all in bytes and represent different values 1,2,3 above thanks, Pádraig.
bug-coreutils@HIDDEN:bug#15056; Package coreutils.
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Date: Fri, 09 Aug 2013 00:35:10 -0400
From: Filipus Klutiero <chealer@HIDDEN>
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Subject: Please indicate the meaning of block sizes in filesystem information
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Severity: wishlist
stat -f provides information on the filesystem, including block sizes:
> Block size: 4096 Fundamental block size: 4096
The unit used in unfortunately not specified. Considering the fdisk output I get...
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
... I guess bits are the unit.
Note that the first measure ("Block size") is quite ambiguous. http://www.hitachi.co.jp/Prod/comp/soft1/manual/jp1en/d3R4900e/PCAU0135.HTM has some block size terminology which might help (if that's indeed the type of block we mean):
> The basic block size (FFBS: Fundamental Filesystem Block Size) used in the field table of this record is the allocation unit used during file system creation. The number of blocks that corresponds to the basic block size is called the /basic block count/. The logical block size (PFBS: Preferred Filesystem Block Size) is the allocation unit used during input/output operations. The number of blocks that corresponds to the logical block size is called the /logical block count/.
--
Filipus Klutiero
http://www.philippecloutier.com
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Severity: wishlist<br>
<br>
stat -f provides information on the filesystem, including block
sizes:<br>
<blockquote type="cite">Block size: 4096 Fundamental block
size: 4096</blockquote>
The unit used in unfortunately not specified. Considering the fdisk
output I get...<br>
<blockquote type="cite">Sector size (logical/physical): 512 bytes /
512 bytes<br>
I/O size (minimum/optimal): 512 bytes / 512 bytes<br>
</blockquote>
... I guess bits are the unit.<br>
<br>
Note that the first measure ("Block size") is quite ambiguous.
<a class="moz-txt-link-freetext" href="http://www.hitachi.co.jp/Prod/comp/soft1/manual/jp1en/d3R4900e/PCAU0135.HTM">http://www.hitachi.co.jp/Prod/comp/soft1/manual/jp1en/d3R4900e/PCAU0135.HTM</a>
has some block size terminology which might help (if that's indeed
the type of block we mean):<br>
<blockquote type="cite">The basic block size (FFBS: Fundamental
Filesystem Block Size) used in the field table of this record is
the allocation unit used during file system creation. The number
of blocks that corresponds to the basic block size is called the <font
face="Times New Roman"><i>basic block count</i></font>. The
logical block size (PFBS: Preferred Filesystem Block Size) is the
allocation unit used during input/output operations. The number of
blocks that corresponds to the logical block size is called the <font
face="Times New Roman"><i>logical block count</i></font>.</blockquote>
<pre class="moz-signature" cols="998">--
Filipus Klutiero
<a class="moz-txt-link-freetext" href="http://www.philippecloutier.com">http://www.philippecloutier.com</a></pre>
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Filipus Klutiero <chealer@HIDDEN>:bug-coreutils@HIDDEN.
Full text available.bug-coreutils@HIDDEN:bug#15056; Package coreutils.
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