GPFS error messages for file system mount problems

There are error messages specific to file system reading, failure, mounting, and remounting.

6027-419
Failed to read a file system descriptor.
6027-482 [E]
Remount failed for device name: errnoDescription
6027-549
Failed to open name.
6027-580
Unable to access vital system metadata. Too many disks are unavailable.
6027-645
Attention: mmcommon getEFOptions fileSystem failed. Checking fileName.