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we have rhel 7.2 server , server is VM server

and we add new disk - sde

with the following example we create ext file system with label - disk2

mkfs.ext4 -L disk2 /dev/sde
mke2fs 1.42.9 (28-Dec-2013)
/dev/sde is entire device, not just one partition!
Proceed anyway? (y,n) y
Discarding device blocks: done
Filesystem label=disk2
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
262144 inodes, 1048576 blocks
52428 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1073741824
32 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

so we get

lsblk -o +FSTYPE,LABEL | grep sde
sde                8:64   0     4G  0 disk                       ext4        disk2

is it possible to create on new disk only the label but without creation of file system?

example of expected output ( without file system on disk )

lsblk -o +FSTYPE,LABEL | grep sde
sde                8:64   0     4G  0 disk                         disk2
yael
  • 13,106

3 Answers3

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The labels shown by lsblk (or rather, blkid) in its LABEL column are the file system labels, which are only available on file systems capable of storing a label. A block device with no file system can’t have such a label.

GPT partitions can also be labeled, and lsblk shows that with PARTLABEL. But that’s not an option for whole disks either.

Stephen Kitt
  • 434,908
  • maybe other solution , I will explain my self , lets say we have a new 3 disks , and I want to join one of this disk to VG by some bash script that will do it auto , but script will choose the disk by some identification like label or something similar , so can we do something about this? – yael Jan 26 '21 at 05:17
  • ok then I will post new question – yael Jan 26 '21 at 05:31
  • I post new question per you request - https://unix.stackexchange.com/questions/631027/linux-is-it-possible-to-identify-specific-new-disk-in-order-to-join-the-new-di – yael Jan 26 '21 at 05:44
  • regarding my new post do you think its possible ? – yael Jan 26 '21 at 06:29
2

According to What does disk label mean?

  • There's the label inside partitions (more correctly inside filesystems) just called LABEL by lsblk -f [On all disks but not for special partitions like swap, procfs, sysfs]
  • There's the label outside partitions but in the partition table called PARTLABEL by lsblk -f [Only gpt disks have this capacity]
  • There's the label outermost which as you rightly suspect is more usually called 'partition table'. This last terminology is more used in other Unix cultures eg OpenBSD, Oracle and BSD.
schrodingerscatcuriosity
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On Rhel7 (assuming the backend supports a label)

e2label /dev/sde (display current label) e2label /dev/sde NEWLABEL (Change to or add NEWLABEL)

user103944
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