Date: Wed, 11 Feb 2004 19:45:22 +0900 From: Rob <nospam@users.sourceforge.net> To: freebsd-questions@freebsd.org Subject: Re: How to safely merge two slices on harddisk? Message-ID: <402A07C2.50005@users.sourceforge.net> In-Reply-To: <200402110030.49302.malcolm.kay@internode.on.net> References: <4026FBA6.8030001@users.sourceforge.net> <200402092225.35217.malcolm.kay@internode.on.net> <4027C835.1040100@users.sourceforge.net> <200402110030.49302.malcolm.kay@internode.on.net>
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Malcolm Kay wrote:
> On Tue, 10 Feb 2004 04:19, Rob wrote:
>
>>Malcolm,
>>
>>Thank you for your detailed answer to my question.
>>
>>Malcolm Kay wrote:
>>
>>>On Mon, 9 Feb 2004 13:46, Rob wrote:
>>> Do not change the offset of 'f'. If 'g' does not physically
>>> follow 'f' on the disk then this is not going to work -- give up
>>> now!!!
>>
>>How can I find that out? Is it the slice order in the disk label editor
>>from /stand/sysinstall :
>
>
> No! What you want is disklabel (see man page). On 5.x this seems to
> have been replaced by bsdlabel -- but I have no experience with 5.x.
The disklabel output of the disk is:
-------------------------------------------------------------------------
# disklabel /dev/ad1s1c:
[...zip...]
8 partitions:
size offset fstype [fsize bsize bps/cpg]
c:156296322 0 unused 0 0 # (Cyl. 0 - 9728*)
a: 204800 0 4.2BSD 0 0 0 # (Cyl. 0 - 12*)
e: 6348800 204800 4.2BSD 0 0 0 # (Cyl. 12*- 407*)
f: 6348800 6553600 4.2BSD 0 0 0 # (Cyl. 407*- 803*)
g: 6348800 12902400 4.2BSD 0 0 0 # (Cyl. 803*- 1198*)
h: 614400 19251200 4.2BSD 0 0 0 # (Cyl. 1198*- 1236*)
b: 614400 19865600 4.2BSD 2048 16384 91 # (Cyl. 1236*- 1274*)
d:135816322 20480000 4.2BSD 0 0 0 # (Cyl. 1274*- 9728*)
-------------------------------------------------------------------------
I have put the partitions in a new order, such that the Cyl. counts are
continuously running up. Am I right, that g physically follows f here?
If so, that would mean I can merge f and g into one new partition of 6 Gb,
right?
I actually wonder if the label editor of /stand/sysinstall can do what
I want. Since I now know that f and g are back-to-front partitions, I could
remove them and create a single new one; when I write this to disk, I can
let sysinstall also create a new filesystem on the newly merged partition.
I know this is potentially dangerous, but this way I have already
deleted the swap partition, created a new ufs partition instead and
created a file system on that; all in sysinstall.
I believe it is safe, as long as I do not run 'newfs' on the existing
partitions.
Or am I missing something important here?
Thanks,
Rob.
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