Date: Thu, 4 Dec 2003 13:52:54 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Rishi Chopra <rchopra@cal.berkeley.edu> Cc: questions@freebsd.org Subject: Re: growfs says 'we are not growing' ?!?! Message-ID: <20031204195254.GH32713@dan.emsphone.com> In-Reply-To: <3FCF87CF.30207@cal.berkeley.edu> References: <3FCEF97C.2020401@cal.berkeley.edu> <20031204152733.GG32713@dan.emsphone.com> <3FCF87CF.30207@cal.berkeley.edu>
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In the last episode (Dec 04), Rishi Chopra said:
> Any idea why my partitions (da0s1a, da0s1d, da0s1e) don't have valid
> disk labels?
>
> # disklabel -A da0s1d | more
> disklabel: /dev/da0s1d: no valid label found
> # disklabel -A da0s1e | more
> disklabel: /dev/da0s1e: no valid label found
>
> I created the partitions and mount points when installing the os
> using the standard GUI.
You don't run disklabel on partitions; you run it on slices. Most
disks will have a single disklabel, which creates all the partitions
needed. Let me see if I can do an ascii-art drawing of a resize
operation:
Original system:
____________________________________________________
1 |______________________DISK__________________________|
2 |MBR|______Slice 1_________|______Slice 2____________|
3 |_a_|___b___|__d___|___e__|
4 |_/_| |_/var_|_/usr_|
Row 1 is the physical layout. Row 2 is composed of the MBR and fdisk
slices. Row 3 is BSD disklabels, and row 4 is filesystems. In this
example, we'll say da0s1 is a non-unix filesystem and ignore it.
da0s2b is swap, which always uses the entire space given to it, which
is why I didn't extend it to row 4. The disklabel header for Slice 2
is actually embedded in the first block of the first partition which is
why there's no |DL| on row 3 to match the |MBR| for slices on row 2.
UFS filesystems skip the first 8k or 64k in a partition to leave room
for the disklabel header and boot blocks.
Grow RAID array:
_____________________________________________________________
|____________________________DISK_____________________________|
|MBR|______Slice 1_________|______Slice 2____________|
|_a_|___b___|__d___|___e__|
|_/_| |_/var_|_/usr_|
Run fdisk on da0 and grow slice 2:
_____________________________________________________________
|____________________________DISK_____________________________|
|MBR|______Slice 1_________|___________Slice 2________________|
|_a_|___b___|__d___|___e__|
|_/_| |_/var_|_/usr_|
Run disklabel on da0s2 and grow partition e:
_____________________________________________________________
|____________________________DISK_____________________________|
|MBR|______Slice 1_________|___________Slice 2________________|
|_a_|___b___|__d___|_______e_______|
|_/_| |_/var_|_/usr__|
Run growfs on da0s2e and grow the filesystem:
_____________________________________________________________
|____________________________DISK_____________________________|
|MBR|______Slice 1_________|___________Slice 2________________|
|_a_|___b___|__d___|_______e_______|
|_/_| |_/var_|_/usr__________|
--
Dan Nelson
dnelson@allantgroup.com
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