There is a high load on one of the Parallels Cloud Server (PCS) clustered nodes, containers are not starting properly on it.
Message area of
pstorage -c CLUSTER_NAME top is full of the following messages:
22-05-13 09:45:27 MDS WRN File operation requested by the client at 10.0.2.11:49789 is failed due to licensed capacity limit [+238/60] 22-05-13 09:45:28 MDS WRN File operation requested by the client at 10.0.2.11:49789 is failed due to licensed capacity limit [+...] 22-05-13 09:46:28 MDS WRN File operation requested by the client at 10.0.2.11:49789 is failed due to licensed capacity limit [+238/60]
On any attempt to start a container, the following error appears:
Failed to mount image /vz/private/CTID/root.hdd: Error in do_lock (lock.c:133): The /pstorage/pcs-cluster/private/CTID/root.hdd/DiskDescriptor.xml.lck is locked: Resource temporarily unavailable 
Parallels Cloud Storage license is marked as "GRACED", as the result - all I/O activity is blocked for files located on a PCS cluster.
Use the following command to find out what your license status is:
~# pstorage -c CLUSTER_NAME view-license | grep -i status status="GRACED"
(Replace "CLUSTER_NAME" with the actual PCS storage cluster name.)
Check the output of
pstorage -c CLUSTER_NAME get-event to find the exact message when the license entered "GRACED" status:
~# pstorage -c CLUSTER_NAME get-event ........ 18-10-13 11:32:57.433 MDS WRN: Size of stored data exceeds licensed capacity limit. 18-10-13 11:32:57.439 JRN INF: gen.license_status=7U 18-10-13 11:32:57.439 MDS WRN: License PCSS.01111111.0001 is GRACED
The similar output indicates that you are hitting the license capacity limit of your PCS storage license (PCSS).
An example of a license that allows you to have 100 GB of storage space (100GB is minimal licensed PCS storage capacity):
~# pstorage -c CLUSTER_NAME view-license | grep capacity capacity=100
Verify your PCS cluster mount point:
~# mount | grep pstorage pstorage://CLUSTER_NAME on /pstorage/CLUSTER_NAME type fuse.pstorage (rw)
And then see how many space is occupied:
~# du -sh /pstorage/CLUSTER_NAME 106G /pstorage/CLUSTER_NAME
If your licensed limit is indeed exceeded, consider upgrading your current license to have sufficient storage capacity.