topic Re: Need Help for MIGRATION? in ONTAP Discussions

Need Help for MIGRATION?

JAFFERALI86 — Thu, 05 Jun 2025 06:20:01 GMT

Hi All,

I need your help for the following scenerio.

We have a FAS2040 in use and we had nearly 6 TB inside and we added extra 3 TB by adding extra disk shelf.

Then we added disk to the existing aggregate but some disk in the same raid group and some in new raid group. (12 disk - 5 to existing aggregate and 7 disk to new aggregate).

In this aggregate we had 3 volumes of around 1.87 TB each and we increased the space to 2.84 TB now. We have 3 LUNS created on 3 volumes and mapped to ESX server. We are using ESX4.1.

But now as per VMWare ESX 4.1 will support only LUN upto 2 TB and we need your help to sort this out and do the best practice to decrease the size of the LUN and create new LUN of 1 TB each.

Thanks for your understandings. Your reply is really appreciated.

Thanks,

Jaffer

Need Help for MIGRATION?

JAFFERALI86 — Thu, 30 Aug 2012 07:06:34 GMT

The volumes are thin provisioned. Please help me to plan for my migration.

Re: Need Help for MIGRATION?

saranraj456 — Thu, 30 Aug 2012 09:20:46 GMT

what is the ontap version?

Check for the occupied size of LUN using lun show -v ,if it is ontap 8.0

If the lun occupied size is less than 1 TB so easy you can reduce the LUN size and volume size.

If it is more than 1 TB need to take a backup of VMDK file & do a restore .Also can do a volume migration if the storage space is available.

Saran

Re: Need Help for MIGRATION?

nigelg1965 — Thu, 30 Aug 2012 09:29:24 GMT

I'm assuming that you've not created any new volumes or luns since adding the extra disk capacity.

In that case the answer is fairly simple, just create a new volume and lun to the size you want and use storage vmotion to move the VM guests over (potentially without down time). Once you've cleared a volume, delete it and create a new one to your preferred size, repeating as needed.

In theory you could resize the luns, but I'm not sure VMWare will like that much.

Re: Need Help for MIGRATION?

JAFFERALI86 — Thu, 30 Aug 2012 09:39:12 GMT

Hi Nigel,

Yes I haven't created any new volumes. Could you please let me know how long it will take to reclaim the space when I delete the existing LUN for creating new LUN.

Thanks and Regards,

Jaffer Ali

Re: Need Help for MIGRATION?

JAFFERALI86 — Thu, 30 Aug 2012 09:40:58 GMT

Hi Saran,

The ontap version is 8.0.X.

I will paste the lun show -v tomorrow. Please help me out. If anyone faced the same situation please let me know.

Thanks and Regards,

Jaffer Ali

Re: Need Help for MIGRATION?

nigelg1965 — Thu, 30 Aug 2012 09:58:15 GMT

The space should be available within a few minutes of deleting the lun, if not check the snapshot (NetApp not VMware) and delete as needed.

Re: Need Help for MIGRATION?

saranraj456 — Thu, 30 Aug 2012 12:24:38 GMT

Jafer,

This one is also a great option to go with.

Re: Need Help for MIGRATION?

AGUMADAVALLI — Thu, 30 Aug 2012 14:38:29 GMT

Hi Jaffer,

Create the new LUNS with the existing space and storage vmotion the vm's, it may be a step by step but it will work.

thank you,

aK G

Re: Need Help for MIGRATION?

JAFFERALI86 — Fri, 31 Aug 2012 01:44:39 GMT

Thank you all for your suggestions. Let me try one and share you all my experience. Once again thanks for your time.

Regards,

Jaffer Ali

Re: Need Help for MIGRATION?

JAFFERALI86 — Mon, 03 Sep 2012 02:04:00 GMT

Thank you all. It worked. I created new volume of 1.84 TB and LUN of 1.8 TB and copied the contents and remapped to ESX. Client doesn't have vmotion license . So I copied.

Once again thank you all for your time.

Regards,

Jaffer Ali