Proxmox KVM virtual machine: Cannot delete due to missing storage

Today we encountered a situation where a Proxmox system’s KVM virtual machine refused to delete after the storage volume that it’s virtual HDD resided on was lost; trying to delete the KVM from the web GUI resulted in the following error:  
TASK ERROR: storage ‘proxmoxHDD’ does not exists
  Attempting to delete it from the command line using:  
qm destroy [VM ID]
  …resulted in:  
storage ‘proxmoxHDD’ does not exists
  Fortunately, there’s a way around this. The KVM config files live in:  
  Move or erase the [VM ID].conf file and when you refresh your web GUI the VM should be gone.

ZFS on Linux: Zpool import failed

We upgraded a Proxmox box today which was running ZFS and ran into this rather scary looking error:  
zpool: ../../lib/libzfs/libzfs_import.c:356: Assertion `nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID, &theguid) == 0′ failed.
  Zpools would not import and zpool status did not work. Resolved (so far, anyhow, still testing) by running:  
apt-get install zfsutils
  Another good reason to have test environments…

  Sometimes a Proxmox KVM VM will stop responding to the GUI’s attempts to shut it down; fortunately it’s easy to shut it down from the command line. Make note of the VM ID (next to the name of the VM in the left pane of the Proxmox GUI), log into the server via SSH as root and run:  
qm stop [vmid]
qm stop 124
  Check back in the GUI a few seconds later and you should see that the KVM has stopped.

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  If you are in a terminal and want to find the container IDs (CTID) quickly without opening up a browser, run the following:  
  It should return a list of the container IDs, the VM state, their IP addresses and hostnames like so:  
      CTID      NPROC STATUS    IP_ADDR         HOSTNAME 100         25 running 101         17 running 102         58 running 103         15 running 104         52 running
Quick and easy.

Proxmox 3.2: Enabling NFS on a container (CT) VM

  If you’re trying to figure out why you are getting NFS errors despite having NFS set up properly on the host machine and client VM, this may be the answer. With the VM powered off, run at the Proxmox terminal:  
vzctl set [VM ID] --features "nfs:on" --save
  The next time the VM is powered up NFS should be enabled and you should be able to mount shares correctly. An example:  
vzctl set 104 --features "nfs:on" --save