I have a hyperv-1 host running on Windows 2008 Server with two virtual machines on it.
One virtual machines has 3 additional vhds attached to it. All of fixed size. All are on their own separate volume (within one disk partition) and have about 500-900MB free space left on their volume. The other second virtual machine has only its vm (vhd file) on a separate disk partition.
There have been no problems for (as far as I can tell) years. However, yesterday, I moved the second virtual machine. (this is not the one with the 3 additional vhds). However, it is still on a separate disk partition as these 3 vhd files.
Hyper-v began issuing error 16050: running low on disk space on drive 'X' for one of the 3 vhds and only one of them. The error is occurring once per minute.
My question is:
1) How much free space does there need to be for Hyper-v to not throw this error? The vhd file is 36GB in fixed size, with 900 MB left on the partition it is residing on. Is there a % free space requirement? I cannot find on-line documentation for this.
2) Is there a reason for Hyperv to suddenly issue this error for a VM that's not been tempered with? I thought it may be a hyper-v host glitch, so I rebooted the host machine, but no change. It is also odd that it is issuing this error for only one vhd and not all three. As all vhd's attached to this vm have the same amount or less of free space.
