topic Re: Extend LUN mapped to physical host in ONTAP Discussions

Extend LUN mapped to physical host

OldGreyBeard — Thu, 26 Aug 2021 19:06:12 GMT

Hi all

Based on a FAS 8000 platform we have some 16Tb LUNS presented to physical hosts as a mapped drive for the purposes of a backup location..

All is well with the world.

Except now i need more disk.

Obviously i cant go above the 16Tb limit

I have the spare disk to cut the LUNS but I'm not sure of the process of how to present them as one 32Tb lump..

(or if its even possible... Any ideas at all..?)

Cheers

Paul

Re: Extend LUN mapped to physical host

Ontapforrum — Thu, 26 Aug 2021 20:16:45 GMT

Most NetApp systems including FAS8000 have 16TB max lun size limit. I am afraid, there isn't any solution to go beyond that limit on that series. You might have to either present another LUN, or migrate some of the load off somewhere else.

I think at present only NetApp AFF All-SAN Arrays can go beyond 16TB limitation (I think they support 128TB Luns/300TB Flexvols).

Re: Extend LUN mapped to physical host

pedro_rocha — Fri, 27 Aug 2021 12:55:44 GMT

if it’s windows you could use dynamic disks to overcome that 16TB limit

On linux use LVM.

Re: Extend LUN mapped to physical host

wareer — Mon, 24 Feb 2025 01:12:20 GMT

The size to which you can increase your LUN varies depending upon your version of ONTAP.

ONTAP versionMaximum LUN size

ONTAP 9.12.1P2 and later	128 TB for AFF, FAS, and ASA platforms
ONTAP 9.8 and later	128 TB for All-Flash SAN Array (ASA) platforms 16 TB for non-ASA platforms
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.

https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/What_is_maximum_size_of_the_LUN_which_can_be_provisioned_from_the_Volume