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ESX 5.5: reclaim thin provisioned space

Posted on 2018-01-12
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Last Modified: 2018-02-04
Hi All,

I'm in the process of migrating an old file server to a new file server.  They both sit on the same SAN volume and are both thin provisioned.

I though as the data moved across it would release the space.  But this doesn't seem to be the case.

Is there a way to release unused thin provisioned space?


Many thanks
D
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Question by:detox1978
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by:CES
ID: 42432868
There is a command called "unmap" that you can run for this:

https://kb.vmware.com/s/article/2057513
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LVL 126
ID: 42432871
What are you expectations, release space where ?
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by:detox1978
ID: 42432906
I've got two VMs on the same datastore.  I thought as I moved files between the two servers the total consumption would stay the same.
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 1000 total points (awarded by participants)
ID: 42432925
so you got two VMs (thin) disks, and you expected the the space in the VMDK to increase as you moved files from it to the other VM disk ?

have a look at this article, you've got some admin/management to do...

https://community.hds.com/docs/DOC-1006003

and to be honest with you, sometimes life is too short to do all this...!!!
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by:detox1978
ID: 42432957
I thought the datastore space would stay the same.  As the files are moving from one  thin provisiined VM to another on the same datastore.  But at the moment the original server is holding onto its space.
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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 1000 total points (awarded by participants)
ID: 42432965
because the blocks have already been written to! and the thin disk has been expanded.....

think of it this way, a zero has become a one......on the sector in the disk...and moving data off, is not going to change that...

the data has not been zeroed, or emptied, it still remains in the NTFS, and could be recovered, just the file table is altered.
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