Release notes
Resize a LUN in ONTAP
Suggest changes
-
PDF of this doc site
-
Cluster administration
-
Volume administration
-
Logical storage management with the CLI
-
-
NAS storage management
-
Configure NFS with the CLI
-
Manage NFS with the CLI
-
Manage SMB with the CLI
-
Manage file access using SMB
-
-
-
Security and data encryption
-
Data protection and disaster recovery
-
Collection of separate PDF docs
Creating your file...
You can increase or decrease the size of a LUN.
This procedure applies to FAS, AFF, and current ASA systems. If you have an ASA r2 system (ASA A1K, ASA A90, ASA A70, ASA A50, ASA A30, or ASA A20), follow these steps to increase the size of a storage unit. ASA r2 systems provide a simplified ONTAP experience specific to SAN-only customers.
|
Solaris LUNs cannot be resized. |
Increase the size of a LUN
The size to which you can increase your LUN varies depending upon your version of ONTAP.
ONTAP version |
Maximum LUN size |
|---|---|
ONTAP 9.12.1P2 and later |
128 TB for AFF, FAS, and ASA platforms |
ONTAP 9.8 and later |
|
ONTAP 9.5, 9.6, 9.7 |
16TB |
ONTAP 9.4 or earlier |
10 times the original LUN size, but not greater than 16TB, which is the maximum LUN size. For example, if you create a 100 GB LUN, you can only grow it to 1,000 GB. The actual maximum size of the LUN might not be exactly 16TB. ONTAP rounds down the limit to be slightly less. |
You do not need to take the LUN offline to increase the size. However, after you have increased the size, you must rescan the LUN on the host for the host to recognize the change in size.
Learn more about lun resize in the ONTAP command reference.
Increase the size of a LUN with ONTAP System Manager (9.7 and later).
-
In System Manager, click Storage > LUNs.
-
Click
and select Edit. -
Under Storage and Optimization increase the size of the LUN and Save.
Increase the size of a LUN with the ONTAP CLI.
-
Increase the size of the LUN:
lun resize -vserver <SVM_name> -volume <volume_name> -lun <lun_name> -size <lun_size>Cli -
Verify the increased LUN size:
lun show -vserver <SVM_name>Cli
ONTAP operations round down the actual maximum size of the LUN so it is slightly less than the expected value. Also, actual LUN size might vary slightly based on the OS type of the LUN. To obtain the exact resized value, run the following commands in advanced mode:
set -unit Blun show -fields max-resize-size -volume volume_name -lun lun_name -
Rescan the LUN on the host.
-
Follow your host documentation to make the newly created LUN size visible to the host file system.
Decrease the size of a LUN
Before you decrease the size of a LUN, the host needs to migrate the blocks containing the LUN data into the boundary of the smaller LUN size. You should use a tool such as SnapCenter to ensure that the LUN is properly decreased without truncating blocks containing LUN data. Manually decreasing the size of your LUN is not recommended.
After you decrease the size of your LUN, ONTAP automatically notifies the initiator that the LUN size has decreased. However, additional steps might be required on your host for the host to recognize the new LUN size. Check your host documentation for specific information about decreasing the size of the host file structure.
