Recovery of free space Compellent

Hi guys, I installed a new Dell SCv2020 Compellent storage with vSphere U3b 5.5 for an existing customer

I have a deep knowledge of Dell PowerVault storage, but I'm new with Dell Compellent. I read that the snapshots for backups or running Storage vMotion can affect free space on the end due to the native LUN provisioning storage: communities.vmware.com/.../436628; TSTART = 0

The suggestion is run or plan the command "esxcli storage vmfs unmap-l MyDatastore" which calls the primitive SCSI UNMAP manually

I tested a Storage vMotion and indeed space on the source LUN are assigned until this only manually 'no '. I have not yet tested how instant backup affect free space on the storage because I've not yet migrated any VM on the new infrastructure (by the way I use v8 of Veeam Backup who insist a lot about VMware snapshots)

Anyone here can share ideas and comments? Thanks a lot guys

Marco

You are on point, use the tool unmap to reclaim space on the LUN. Compellent thin provisions at the end back and depending on your environment, you should probably be thin provisioning your LUN on the end of VMware. To the wire when you remove VMware servers and vmotion of data store to data store space, will not be recovered on Compellent b/c, that storage is ignorant because data are only is more used. The "fix" for what there is complete integration between VMware and Dell is to run that unmap tool.

What started doing every quarter or so is to run the tool unmap on all LUNS that are thin and put into service (in our environment all volumes). I tested unmap several times and I had no problems with running the tool while the servers are running on this volume. I would say that the tool running on a server that does not have a lot of load work because the CPU spike during unmap (datastore readings will boost as well).

Regarding backups and snapshots, I have no problems with the space about those. Replays freeze blocks of reference data, but once this review has expired the space is recovered. Regarding backups depends on what you use for backups - we use CommVault who will take a glance of the LUN, copy the data off power then release the tension (so for a short period of time, he didn't there ate during the backup space, but it takes a few minutes to copy the data).

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