A new LUN has no partition or file system when the Linux host first discovers it. You must format the LUN before it can be used. Optionally, you can create a file system on the LUN.
Before you begin
The host must have discovered the LUN.
In the /dev/mapper folder, you have run the ls command to see the available disks.
You can initialize the disk as a basic disk with a GUID partition table (GPT) or Master boot record (MBR).
Format the LUN with a file system such as ext4. Some applications do not require this step.
- Retrieve the SCSI ID of the mapped disk by issuing the multipath -ll command.
The SCSI ID is a 33-character string of hexadecimal digits, beginning with the number 3. If user-friendly names are enabled, Device Mapper reports disks as mpath instead of by a SCSI ID.
# multipath -ll
mpathd(360080e5000321bb8000092b1535f887a) dm-2 LENOVO ,DE_Series
size=1.0T features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| |- 16:0:4:4 sde 69:144 active ready running
| `- 15:0:5:4 sdf 65:176 active ready running
`-+- policy='service-time 0' prio=10 status=enabled
|- 16:0:5:4 sdg 70:80 active ready running
`- 15:0:1:4 sdh 66:0 active ready running
- Create a new partition according to the method appropriate for your Linux OS release.
Typically, characters identifying the partition of a disk are appended to the SCSI ID (the number 1 or p3 for instance).
# parted -a optimal -s -- /dev/mapper/360080e5000321bb8000092b1535f887a mklabel
gpt mkpart primary ext4 0% 100%
- Create a file system on the partition.
The method for creating a file system varies depending on the file system chosen.
# mkfs.ext4 /dev/mapper/360080e5000321bb8000092b1535f887a1
- Create a folder to mount the new partition.
- Mount the partition.
# mount /dev/mapper/360080e5000321bb8000092b1535f887a1 /mnt/ext4