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Space allocation on NetApp LUN

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Hello,

 

I am wondering if anyone else is experiencing this issue.

 

Short facts about our system:

- NetApp AFF220 IP-Metrocluster (ONTAP 9.6 P3)

- VMware ESXi 6.7 U3

- Thin provisioned LUNs with space allocation disabled

 

Problem is:

- Space reclaim is not working properly

 

How the issue gets visible:

- When I use storage vmotion to migrate a machine with approx 50% unique data from A to B, no space is getting free on the source volume

 

How I can work around this problem:

- Enable space allocation on this LUN, then suddenly the space will get reclaimed

 

Why this is weird:

- We never created our LUNs other than as recommended by NetApp. Plus we need space allocation as a protection function if the LUN runs out of space.

 

Is anyone else experiencing this problem?

 

Best regards and thanks

Alex


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