How check LUN size in Linux?

How check SAN LUN Linux?

so the first device in command “ls -ld /sys/block/sd*/device” corresponds to the first device scene in the command “cat /proc/scsi/scsi” command above. i.e. Host: scsi2 Channel: 00 Id: 00 Lun: 29 corresponds to 2:0:0:29. Check the highlighted portion in both commands to correlate. Another way is to use sg_map command.

How many LUNs do I have Linux?

Method-1: How to scan/detect new LUNs and SCSI disks in Linux, using the “/sys” class file

  1. c – Channel on the HBA.
  2. t – SCSI target ID.
  3. l – LUN ID.
  4. n – HBA number.

What is Lun in Linux?

A logical unit number (LUN) is a number used for identifying a logical unit relating to computer storage. A logical unit is a device addressed by protocols and related to fiber channel, small computer system interface (SCSI), Internet SCSI (iSCSI) and other comparable interfaces.

What is a LUN size?

Supported sizes are from 1 to 16 TiB in increments of 1 GiB. The supported ESS LUN sizes are limited to the exact sizes that are specified from 0.1 to 982.2 GB (decimal) in increments of 0.1 GB and are rounded up to the next larger 32 K byte boundary.

How do I find Lun details on OS?

Using Disk Manager

  1. Access Disk Manager under “Computer Management” in “Server Manager” or in the command prompt with diskmgmt.msc.
  2. Right-Click on the side-bar of the disk you wich to view and select “Properties”
  3. You will see the LUN number and the target name. In this example it’s “LUN 3” and “PURE FlashArray”
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How increase LUN size in Linux?

Resizing a LUN:

  1. Increase the size of the LUN on the SAN.
  2. On the server, execute `echo 1 > /sys/block/sdX/device/rescan`.
  3. Resize the MPIO map. a) On SLES11 or SLES12, use `multipathd -k’resize map <MPIO_MAP_NAME>’`

Where is the LUN UUID in Linux?

To see the uuid of a hard disk partition I just boot the system up with a Linux CD and goto my computer mount, click on, the partition I want to see. The uuid number of the Linux partition will be displayed. You can also see disk uuid by running Linux Disk utility after the Linux CD boot up.

Where is New LUN in Linux?

Follow the steps below to scan the new LUN in OS and then in multipath.

  1. Rescan SCSI hosts: # for host in ‘ls /sys/class/scsi_host’ do echo ${host}; echo “- – -” > /sys/class/scsi_host/${host}/scan done.
  2. Issue LIP to FC hosts: …
  3. Run rescan script from sg3_utils:

Is a LUN a volume?

Yes. A LUN is a logical volume from the point of view of the storage. From the client point of view the LUN it is a disc volume that can be partitioned. Volume is a generic term.

What is LUN mapping?

LUN mapping is the process of controlling which hosts have access to specific logical units (LUs) within the disk controllers. LUN mapping is typically done at the storage system level. Host mapping is done at the software level.

How do you make a LUN?


  1. Click Storage > LUNs.
  2. In the LUN Management tab, click Create.
  3. Browse and select an SVM in which you want to create the LUNs.
  4. In the Create LUN Wizard, specify the name, size, type, description for the LUN, and select the Space Reserve, and then click Next.
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