The Question is:
1-How do I reboot the system if I can't see the prompt.
2-Did I lose any data?
The Answer is :
Please follow the documented emergency startup sequence listed
in the OpenVMS System Manager's Manual -- documentation that
specifically targets booting when insufficient system disk space
is available is included -- or please follow the basic sequence
shown in the OpenVMS FAQ for the conversational bootstrap and
then archive and/or delete outdated or unnecessary files.
You obviously lost the ability to write data to the disk when
the disk filled, but no losses of any existing data already on
the disk are expected.
You can use ANALYZE/DISK to verify the disk file structure, if
you are concerned. (With /REPAIR, this will also free up any
disk storage that is allocated to old and outdated caches or to
files that were incompletely deleted, and will report and normally
resolve other such benign file structure conditions, releasing this
disk storage back into the available pool.)
Your OpenVMS version is outdated. Please move to a supported
release, and please apply the available mandatory ECO kits.
(To find the mandatory kits, please see the ECO search engine
referenced in the OpenVMS Frequently Asked Questions (FAQ).
The FAQ also has pointers to the OpenVMS documentation.)