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Re: Disklabel type

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  Re: Disklabel type David <bouncingcats@gmail.com> - 2021-06-27 13:00 +0200
    Re: Disklabel type David <bouncingcats@gmail.com> - 2021-06-27 13:10 +0200

#236523 — Re: Disklabel type

On Sun, 27 Jun 2021 at 20:05, mick crane <mick.crane@gmail.com> wrote:
>
> I don't know what happened here.
> Can I change the Disklabel without messing things up or is it necessary
> ?
>
> root@pumpkin:~# fdisk /dev/sda
> Disk /dev/sda: 223.57 GiB, 240057409536 bytes, 468862128 sectors
> Disk model: KINGSTON SA400S3
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: dos
> Disk identifier: 0x64b83d98
>
> Device     Boot  Start       End   Sectors   Size Id Type
> /dev/sda1  *      2048    499711    497664   243M 83 Linux
> /dev/sda2       501758 468860927 468359170 223.3G  5 Extended
> /dev/sda5       501760 468860927 468359168 223.3G 8e Linux LVM
>
>
> root@pumpkin:~# e2label /dev/sda
> e2label: Bad magic number in super-block while trying to open /dev/sda
> Found a dos partition table in /dev/sda

You're trying to apply a *filesystem* label to a block *device*.
That cannot work.

It's hard to know what your goal is there, but perhaps 'e2label /dev/sda1'
is what you actually want. The partition information above doesn't
suggest any other possibilites that would succeed.

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#236525

On Sun, 27 Jun 2021 at 20:51, David <bouncingcats@gmail.com> wrote:

> You're trying to apply a *filesystem* label to a block *device*.
> That cannot work.

Not the best wording, sorry, I'll try to be a bit clearer.

Your command failed because it tried to apply a *filesystem* label to a
partitioned block device /dev/sda. That cannot work because /dev/sda
is currently not an extN filesystem. /dev/sda rather contains a partition table
and partitions. And in this case, as is very common, it is the partition
that likely contains an extN filesystem. The only partition that you show
that does contain a extN filesystem is /dev/sda1.

/dev/sda2 contains an extended msdos partition, which is not a
extN filesystem.

/dev/sda5 is a logical partition inside /dev/sda2, and
it is being used by LVM, so the device /dev/sda5 also is not
an extN filesystem. Although some of the LVM devices inside it
may well be extN filesystems providing your root and home.

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