Because 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.
What you’ll need
A LUN that is discovered by the host.
A list of available disks. (To see available disks, run the
lscommand in the /dev/mapper folder.)
About this task
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
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.
# mkdir /mnt/ext4
Mount the partition.
# mount /dev/mapper/360080e5000321bb8000092b1535f887a1 /mnt/ext4