I’ve been working through a process of cleaning and optimising the C drives on a lot of VMs recently. Over time they build up with lots of junk that, when put together with hundreds of VMs, requires a significant amount of extra primary VM storage, backup storage, and increases backup times. These files also take up space within the VM that can cause security and anti-malware updates to fail, and lead to application or logging failures. The reduced free space also leads to increased file fragmentation, which then means more IOs to and from your storage.
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