Zero Out Free Space
This is post #10 in my December 2013 series about Linux Virtual Machine Performance Tuning. For more, please see the tag “Linux VM Performance Tuning.” When we talked about the rationale behind storing logs centrally one big reason was thin-provisioned virtual disks. Those disks grow over time because filesystems on a virtual machine currently have no way to tell the underlying storage that they’re done using certain blocks on disk. There is a way to make these VMs thin again, and I wrote about it as step 9 in my guide to preparing Linux Template VMs. In short, we run a script on the VM that writes zeroes to most of the free space on the VM: #!/bin/sh # Determine …
