Xsan 1.3 and Later: LUNs with capacity larger than 2.0TB may appear as being 2.0TB in size.

Prior to Xsan 1.3, LUNs with actual capacity greater than 2.0TB that have been incorporated into ACFS volumes appear as 2.0TB and are limited to that amount of use, an automatically imposed limit known as "truncation." Xsan 1.3 supports LUNs larger than 2.0TB, but LUNs truncated under previous versions of Xsan will remain truncated.

After updating to Xsan 1.3, you can reclaim the drive space on truncated LUNs by erasing the LUN.

Warning: Erasing a LUN will destroy the data on the LUN which will, in turn, destroy the data on an Xsan volume that incorporates the LUN. Therefore, you must back up all data on the Xsan volume and then delete the Xsan volume before erasing the LUN.

Follow these steps:

Note: If you have a LUN that has been truncated to 2TB and is not part of a volume, you can skip straight to step 8.

1. Back up all data on the Xsan volume.
2. Unmount the volume from all machines.
3. Stop the volume.
4. In Xsan Admin 1.3, choose Setup > Storage.
5. Select the Xsan volume, and click the "-" button to delete the volume.
6. Click Save, and then choose the option to Delete.
7. In Xsan Admin 1.3, choose Setup > LUNs.
8. Select the LUN that needs to be erased, and click the Edit button.
9. Delete the text in the Label field, then click OK.
10. In Xsan Admin 1.3, choose Setup > LUNs. The LUN which was unlabeled will now appear as "Unlabeled."
11. Select the LUN, and click edit.
12. Enter a LUN name, check the box "Allow LUN to exceed 2 TB capacity," and save it.

The LUN will now use the full capacity of its storage.