Date: Fri, 29 Jun 2012 16:24:01 +0300 (EEST) From: Sayetsky Anton <vsjcfm@gmail.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/169542: gpart: partition alignment doesn't works on MBR Message-ID: <201206291324.q5TDO14h030776@jw.lds.net.ua> Resent-Message-ID: <201206291330.q5TDUDE0033459@freefall.freebsd.org>
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>Number: 169542
>Category: bin
>Synopsis: gpart: partition alignment doesn't works on MBR
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Jun 29 13:30:13 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Sayetsky Anton
>Release: FreeBSD 8.3-RELEASE-p1 amd64
>Organization:
>Environment:
System: FreeBSD jw.local 8.3-RELEASE-p1 FreeBSD 8.3-RELEASE-p1 #0 r235504: Wed May 16 14:33:18 EEST 2012 root@j.local:/tmp/obj/mnt/garbage/build/src/sys/JASONW amd64
>Description:
Alignment values computed by gpart are incorrect when using MBR scheme.
When using GPT - they are correct.
As wee can see below, alignment & size of partitions isn't divideable by 8 when using "-a 4k"
>How-To-Repeat:
********************* MBR **************************
root@jw:~# mdconfig -s 2048m
md0
root@jw:~# gpart create -s mbr md0
md0 created
root@jw:~# gpart show md0
=> 63 4194241 md0 MBR (2.0G)
63 4194241 - free - (2G)
root@jw:~# gpart add -a 4k -t freebsd -s 100m md0
md0s1 added
root@jw:~# gpart add -a 4k -t freebsd md0
md0s2 added
root@jw:~# gpart show md0
=> 63 4194241 md0 MBR (2.0G)
63 63 - free - (31k)
126 204687 1 freebsd (100M)
204813 63 - free - (31k)
204876 3989412 2 freebsd (1.9G)
4194288 16 - free - (8.0k)
********************* MBR **************************
********************* GPT **************************
root@jw:~# mdconfig -s 2048m
md0
root@jw:~# gpart create -s gpt md0
md0 created
root@jw:~# gpart add -a 4k -t freebsd -s 100m md0
md0s1 added
root@jw:~# gpart add -a 4k -t freebsd md0
md0s2 added
root@jw:~# gpart show md0
=> 34 4194237 md0 GPT (2.0G)
34 6 - free - (3.0k)
40 204800 1 freebsd (100M)
204840 3989424 2 freebsd (1.9G)
4194264 7 - free - (3.5k)
********************* GPT **************************
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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