Check risk of metadata partition filling up with LVM Thin Provisioning

[qubesuser]

According to "man lvmthin" section "Metadata space exhaustion", exhaustion of a thin pool's metadata space can cause "inconsistent thin pool metadata and inconsistent file systems" (and even if that's not accurate it would necessarily stop thin volume creation and thus starting and creating VMs), so it would be important to avoid it.

Currently Qubes installer seems to create a ~100MB metadata partition and also leave ~15-16GB free. According to "man lvmthin" it seems possible to have the metadata partition automatically grow, but it's not clear how, and not clear whether this is enabled by the Qubes installer.

It would be nice to make sure that either the metadata partition is automatically extended up to the 16GB limit or just create a 16GB metadata partition from the start.