GNU parted instead of fdisk to avoid 2TB partitions limit
  • Post category:Uncategorized
  • Post comments:0 Comments

We already know how to set up a Disk NAS using iSCSI, but if you want a more than 2TB Linux partition don’t even bother using the traditional fdisk. You’ll have the following message:

# fdisk /dev/sdb
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: The size of this disk is 5.9 TB (5908688535552 bytes).
DOS partition table format can not be used on drives for volumes
larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID
partition table format (GPT).
Creating 2TB partition using Fdisk

The size of the disk in this example is roughly 6 TB. In our case, we need to create a partition >2TB. So, we should use parted command.

Before creating the partition command, we should set the disk label to GPT, it stands for GUID partition table format (GPT).

Use parted’s mklabel command to set disk label to GPT as shown below:

# parted /dev/sdb
GNU Parted 2.1
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) print
Error: /dev/sdb: unrecognised disk label

(parted) mklabel gpt

(parted) print
Model: Unknown (unknown)
Disk /dev/sdb: 5909GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags

Creating >2TB Partition using Parted mkpart

Use parted’s mkpart command as shown below to create partition that is greater than 2TB. In this example, we are creating a partition that is roughly of 6TB in size.

# parted /dev/sdb

(parted) mkpart primary 0GB 5909GB

(parted) print
Model: Unknown (unknown)
Disk /dev/sdb: 5909GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags
1 1049kB 5909GB 5909GB primary

Use mkfs (mkfs.ext4, mkfs.xfs etc.) to format the partition. This will take some time depending the size of the partition. You’ll see that it is “Writing inode tables” and the counter will keep increasing. In this example, it roughly took around 15 minutes to complete the mkfs.

# mkfs /dev/sdb1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
360644608 inodes, 1442550528 blocks
72127526 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
44024 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, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848, 512000000, 550731776, 644972544

Writing inode tables: 3955/44024
Writing inode tables: 5022/44024
Writing inode tables: 7218/44024
Writing inode tables: done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 23 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

Finally, create a fstab entry for this disk and mount it in some create directory (again refer to this article), then check the available disk:

# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 127G 1.6G 119G 2% /
/dev/sdb1 5.3T 59M 5.1T 1% /data

Adapted from:

Disponível em: pt-brPortuguês (Portuguese (Brazil))enEnglish

Leave a Reply