Shrink a LUN on E-series

[kevincorrie]

Can anyone tell me if it's possible to shrink a LUN on an E-series SAN?  Just poking around in SANtricity, I don't see where LUN size can be reduced.  Googling hasn't helped either.

[MitchBlackburn]

Shrinking a LUN is only possible if you are using DDP. If you are using standard RAID volume groups, it is not possible. Mitch.

[kevincorrie]

Thanks for the response.  I'm a bit of a layman.  Can you tell me how I'd determine this?

[pedro_rocha]

Hi,

You cannot shrink a LUN on an E-Series array.

You can increase it's size.

You can shrink a Pool if the volume/lun sits on a Pool to reclaim some space to other Pools/Volume Groups.

[kevincorrie]

I'm aware I can increase which, I guess, is why I thought I could also shrink.  I just have a single pool, and I want to add more LUNs which is why I need to recover some free space by shrinking LUNs.

I'm SOL?

[pedro_rocha]

This can give you more info: https://www.netapp.com/pdf.html?item=/media/12421-tr4652.pdf

I still think you cannot shrink a LUN/VOLUME.

You can shrink a POOL. Which contains a LUN/VOLUME.

I think that under storage you can see drive pool or drive raid X:

[ahmadm · Accepted solution]

Under Storage > Pools & Volume Groups, you can determine if the RAID group is a dynamic disk pool or traditional RAID group. For dynamic disk pool (DDP), the pool will be labeled "Drive pool" (see screenshot in previous message). 

Furthermore, the volume must be thin provisioned in order to shrink and reclaim capacity in the pool. Standard volumes cannot be shrunk. 

Standard vs thin volumes:

https://docs.netapp.com/ess-11/topic/com.netapp.doc.ssm-sam-117/GUID-1B5AAF82-71A0-4648-A0F6-4F757DC38C85.html