GNU parted instead of fdisk to avoid 2TB partitions limit
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: http://www.thegeekstuff.com/2012/08/2tb-gtp-parted/