what is VMFS datastore ?
Create VMFS datastore. VMFS datastores are used as repositories for virtual machines’ files. They can be set up on any SCSI-based storage device that the ESXi host discovers, such as Fibre Channel, iSCSI, or local storage devices.
Space reclamation method
The method can be either priority or fixed. When the method you use is priority, you configure the priority rate. For the fixed method, you must indicate the bandwidth in MB per second.
Space reclamation priority
This parameter defines the rate at which the space reclamation operation is performed when you use the priority reclamation method. Typically, VMFS6 can send the unmap commands either in bursts or sporadically depending on the workload and configuration. For VMFS6, you can specify one of the following options.
It was a bit quiet here in January caused by a new “private project” which has attracted some resources, and will pull more resources in the future.
But this will not stop me from documenting useful stuff. This one is nothing new, but commonly asked by some customers: How do I get my storage capacity back after deleting VMs?!
The outlined steps are all done using esxcli. You need to execute them on a single ESXi host, not on each host in the cluster.
Connect to one of your ESXi hosts using SSH. You can use this small PowerCLI command to enable SSH on a specific host.
Get-VMHost esx1.lab.local | Get-VMHostService | Where Key -EQ “TSM-SSH” | Start-VMHostService
The first step is to identify the datastore(s) from which you want to reclaim storage.
[root@esx1:~] esxcli storage vmfs extent list
Volume Name VMFS UUID Extent Number Device Name Partition
————- ———————————– ————- ———————————— ———
VMDS01 55dc0522-c72eebec-3780-d89d672d7a3c 0 naa.60030d90eca17602ce5c5a54a083e31c 1
We will need the device name, and later the UUID. The next step is to identify if the device is detected as a thin-provisioned disk, and if it is VAAI-capable. I’ve shortened the output of the esxcli output to the necessary output.
[root@esx1:~] esxcli storage core device list -d naa.60030d90eca17602ce5c5a54a083e31c
Thin Provisioning Status: yes
VAAI Status: supported
No we have to verify if all necessary VAAI options are supported.
[root@rzb-esx-1:~] esxcli storage core device vaai status get -d naa.60030d90eca17602ce5c5a54a083e31c
VAAI Plugin Name:
ATS Status: supported
Clone Status: supported
Zero Status: supported
Delete Status: supported
Important for us is the “Delete” primitive. If this is supported, we can use UNMAP to reclaim storage.
[root@rzb-esx-1:~] esxcli storage vmfs unmap -u 55dc0522-c72eebec-3780-d89d672d7a3c
Note: This process will take some time depending on the amount of storage that has to be reclaimed. And it will put some load on your storage, so you might want to run this in a less productive time.
Thanks hope you like it.