Issue
During the boot sequence of a Xenta Server the message "Unmap block xxx at remount" occurs.
Environment
Xenta 511
Xenta 527
Xenta 555
Xenta 701
Xenta 711
Xenta 721
Xenta 731
Xenta 913
Cause
Sections of the flash drive are being declared bad and are being removed from the accessible drive map. This can be a natural pruning process of bad sections due to drive damage or that section exceeding the maximum number of writes.
The amount of lost space is:
# of pages * 2 bytes
All hardware 2 Xenta Servers have 16mb flash drives, so it takes a large number of pages to be lost before significant space is lost and will impact performance of the unit.
Resolution
If the number of pages is low and is not increasing then the unit should function normally without any additional action.
If the number of pages is exceeding 50000 or increasing rapidly, then have the Xenta Server repaired or replaced depending on its age.