Received: (at submit) by debbugs.gnu.org; 1 Feb 2016 17:04:48 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Feb 01 12:04:48 2016 Received: from localhost ([127.0.0.1]:45392 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aQHuC-0008Ma-H7 for submit <at> debbugs.gnu.org; Mon, 01 Feb 2016 12:04:48 -0500 Received: from eggs.gnu.org ([208.118.235.92]:57779) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from <bcl@HIDDEN>) id 1aQHuB-0008MD-J1 for submit <at> debbugs.gnu.org; Mon, 01 Feb 2016 12:04:48 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <bcl@HIDDEN>) id 1aQHtv-0007ai-JI for submit <at> debbugs.gnu.org; Mon, 01 Feb 2016 12:04:36 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_05 autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:56528) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <bcl@HIDDEN>) id 1aQHtv-0007ae-Ga for submit <at> debbugs.gnu.org; Mon, 01 Feb 2016 12:04:31 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48745) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <bcl@HIDDEN>) id 1aQHts-0000Xp-A0 for bug-parted@HIDDEN; Mon, 01 Feb 2016 12:04:31 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <bcl@HIDDEN>) id 1aQHtn-0007a5-Jt for bug-parted@HIDDEN; Mon, 01 Feb 2016 12:04:28 -0500 Received: from mx1.redhat.com ([209.132.183.28]:43898) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <bcl@HIDDEN>) id 1aQHtn-0007Zq-EG for bug-parted@HIDDEN; Mon, 01 Feb 2016 12:04:23 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (Postfix) with ESMTPS id 6586830C7D2; Mon, 1 Feb 2016 17:04:22 +0000 (UTC) Received: from lister.brianlane.com ([10.3.113.18]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u11H4K3W026069 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 1 Feb 2016 12:04:21 -0500 Date: Mon, 1 Feb 2016 09:04:20 -0800 From: "Brian C. Lane" <bcl@HIDDEN> To: bug-parted@HIDDEN Subject: Re: bug#22496: why does the parted math look wrong - Q1 ? Message-ID: <20160201170420.GA9409@HIDDEN> References: <56AD21AC.1060401@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <56AD21AC.1060401@HIDDEN> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.1 (----) X-Debbugs-Envelope-To: submit Cc: cj@HIDDEN X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://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: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Reply-To: parted-devel@HIDDEN Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -4.1 (----) On Sat, Jan 30, 2016 at 03:48:44PM -0500, Chris Johnson wrote: > Hi, > > I need some education on how parted is doing math. ;-) It would probably be better to have this discussion on the devel list, not the bug tracker: parted-devel@HIDDEN AFAIK nobody uses cylinders for anything these days. I certainly haven't used them for over a decade. Why aren't you using sectors? As far as understanding the math, you're probably going to have to look at the code :) -- Brian C. Lane | Anaconda Team | IRC: bcl #anaconda | Port Orchard, WA (PST8PDT)
bug-parted@HIDDEN:bug#22496; Package parted.
Full text available.Received: (at submit) by debbugs.gnu.org; 31 Jan 2016 18:39:14 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun Jan 31 13:39:14 2016 Received: from localhost ([127.0.0.1]:43431 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aPwu1-0001K6-G0 for submit <at> debbugs.gnu.org; Sun, 31 Jan 2016 13:39:14 -0500 Received: from eggs.gnu.org ([208.118.235.92]:34135) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from <debianbugs@HIDDEN>) id 1aPvcl-0007oN-P7 for submit <at> debbugs.gnu.org; Sun, 31 Jan 2016 12:17:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <debianbugs@HIDDEN>) id 1aPvcf-000223-RU for submit <at> debbugs.gnu.org; Sun, 31 Jan 2016 12:17:14 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50 autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:57925) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <debianbugs@HIDDEN>) id 1aPvcf-00021m-NI for submit <at> debbugs.gnu.org; Sun, 31 Jan 2016 12:17:13 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53322) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <debianbugs@HIDDEN>) id 1aPvce-0001TY-GF for bug-parted@HIDDEN; Sun, 31 Jan 2016 12:17:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <debianbugs@HIDDEN>) id 1aPvca-0001v7-5i for bug-parted@HIDDEN; Sun, 31 Jan 2016 12:17:12 -0500 Received: from ns3003043.ip-151-80-42.eu ([151.80.42.189]:41550) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <debianbugs@HIDDEN>) id 1aPvcZ-0001pU-VC for bug-parted@HIDDEN; Sun, 31 Jan 2016 12:17:08 -0500 Subject: Re: bug#22496: why does the parted math look wrong - Q1 ? To: bug-parted@HIDDEN From: Narcis Garcia <debianbugs@HIDDEN> Date: Sun, 31 Jan 2016 18:16:48 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x Message-ID: <E1aPvcZ-0001pU-VC@HIDDEN> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Sun, 31 Jan 2016 13:39:12 -0500 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://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: <https://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: -4.0 (----) I see inconsistent data when printing table. It shoud be: Number Start End Size File system Name Flags 1 0cyl 121600cyl** 121601cyl* zfs 9 121600cyl** 121601cyl 2cyl* * Starting cylinder should be the first cylinder and count in the amount ** Strange ending at same cylinder that other partition begins. The problem may be partitions aren't created in cylinders (but sectors), and you try to calculate numbers based on a worng unit now. On 30/01/16 21:48, Chris Johnson wrote: > Hi, > > I need some education on how parted is doing math. ;-) > > The drive is 1 TB. > > # parted /dev/rdsk/c7t1d0p0 > GNU Parted 2.3.0 > Using /dev/rdsk/c7t1d0p0 > Welcome to GNU Parted! Type 'help' to view a list of commands. > (parted) unit cyl > unit cyl > (parted) p > p > Model: Generic Ide (ide) > Disk /dev/rdsk/c7t1d0p0: 121601cyl > Sector size (logical/physical): 512B/512B > BIOS cylinder,head,sector geometry: 121601,255,63. Each cylinder is 8225kB. > Partition Table: gpt > > Number Start End Size File system Name Flags > 1 0cyl 121600cyl 121600cyl zfs > 9 121600cyl 121601cyl 1cyl > > * > Question 1)* > > Based on the parted value 8225KB per cylinder, I would think that > sectors per cylinder could be calculated thus > > 8225 KB/cyl * 1024 Bytes/KB = 8422400 Bytes/cyl > > and 8422400 Bytes/cyl / 512 Bytes/sector = 16450 sectors per cylinder > > However, I would also think that sectors per cylinder could be > calculated thus: > > > 255 * 63 = 16065 sectors per cylinder > > Obviously these numbers do not match. > > Just for the heck of it, in case when parted says 1 KB it means 1,000 > bytes not 1,024 bytes, I did this math. > > 8225 * 1000 = 8225000 / 512 = 16064.4531 sectors per cylinder > > which is certainly closer to the value you get from 255 * 63 but it > really doesn't make any sense to me to be thinking that we are getting a > fractional number of sectors in a given cylinder. > > > Thanks for your insight.
bug-parted@HIDDEN:bug#22496; Package parted.
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Date: Sat, 30 Jan 2016 15:48:44 -0500
From: Chris Johnson <cj@HIDDEN>
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Hi,
I need some education on how parted is doing math. ;-)
The drive is 1 TB.
# parted /dev/rdsk/c7t1d0p0
GNU Parted 2.3.0
Using /dev/rdsk/c7t1d0p0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) unit cyl
unit cyl
(parted) p
p
Model: Generic Ide (ide)
Disk /dev/rdsk/c7t1d0p0: 121601cyl
Sector size (logical/physical): 512B/512B
BIOS cylinder,head,sector geometry: 121601,255,63. Each cylinder is 8225kB.
Partition Table: gpt
Number Start End Size File system Name Flags
1 0cyl 121600cyl 121600cyl zfs
9 121600cyl 121601cyl 1cyl
*
Question 1)*
Based on the parted value 8225KB per cylinder, I would think that
sectors per cylinder could be calculated thus
8225 KB/cyl * 1024 Bytes/KB = 8422400 Bytes/cyl
and 8422400 Bytes/cyl / 512 Bytes/sector = 16450 sectors per cylinder
However, I would also think that sectors per cylinder could be
calculated thus:
255 * 63 = 16065 sectors per cylinder
Obviously these numbers do not match.
Just for the heck of it, in case when parted says 1 KB it means 1,000
bytes not 1,024 bytes, I did this math.
8225 * 1000 = 8225000 / 512 = 16064.4531 sectors per cylinder
which is certainly closer to the value you get from 255 * 63 but it
really doesn't make any sense to me to be thinking that we are getting a
fractional number of sectors in a given cylinder.
Thanks for your insight.
--------------010503040505010102090305
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<font face="Courier New, Courier, monospace">Hi,<br>
<br>
I need some education on how parted is doing math. ;-)<br>
<br>
The drive is 1 TB.<br>
<br>
# parted /dev/rdsk/c7t1d0p0<br>
GNU Parted 2.3.0<br>
Using /dev/rdsk/c7t1d0p0<br>
Welcome to GNU Parted! Type 'help' to view a list of commands.<br>
(parted) unit
cyl <br>
unit cyl<br>
(parted)
p <br>
p<br>
Model: Generic Ide (ide)<br>
Disk /dev/rdsk/c7t1d0p0: 121601cyl<br>
Sector size (logical/physical): 512B/512B<br>
BIOS cylinder,head,sector geometry: 121601,255,63. Each cylinder
is 8225kB.<br>
Partition Table: gpt<br>
<br>
Number Start End Size File system Name Flags<br>
1 0cyl 121600cyl 121600cyl zfs<br>
9 121600cyl 121601cyl 1cyl<br>
<br>
</font><font face="Courier New, Courier, monospace"><b><br>
Question 1)</b><br>
<br>
Based on the parted value 8225KB per cylinder, I would think
that sectors per cylinder could be calculated thus<br>
<br>
8225 KB/cyl * 1024 Bytes/KB = 8422400 Bytes/cyl <br>
<br>
</font><font face="Courier New, Courier, monospace">and 8422400
Bytes/cyl / 512 Bytes/sector = 16450 sectors per cylinder<br>
<br>
</font><font face="Courier New, Courier, monospace">However, I would
also think that sectors per cylinder could be calculated thus:<br>
255 * 63 = 16065 sectors per cylinder<br>
<br>
Obviously these numbers do not match.<br>
<br>
Just for the heck of it, in case when parted says 1 KB it means
1,000 bytes not 1,024 bytes, I did this math.<br>
<br>
8225 * 1000 = 8225000 / 512 = 16064.4531 sectors per
cylinder<br>
<br>
which is certainly closer to the value you get from 255 * 63 but
it really doesn't make any sense to me to be thinking that we are
getting a fractional number of sectors in a given cylinder.<br>
<br>
<br>
</font><font face="Courier New, Courier, monospace">Thanks for your
insight. </font><br>
</body>
</html>
--------------010503040505010102090305--
Chris Johnson <cj@HIDDEN>:bug-parted@HIDDEN.
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