User's Manual

hp StorageWorks File System Extender User Guide 97
CAUTION: With either parameter, only the migrated generations containing file contents count as file
generations. The migrated generations that contain only file headers (name, standard and extended
attributes, ACLs, ...) or changes to a file alternate data stream do not count as migrated file generations.
Generally, these generations are not preserved during media reorganization.
The boundary migration date and time parameter
If only this parameter is specified, all migrated file data generations created after the boundary migration
date and time parameter are considered as valid.
The number of latest generations parameter
This optional parameter limits the number of generations that would otherwise be considered as valid by
the boundary migration date and time parameter alone.
If the parameter value is smaller than the number of valid generations determined by the boundary
migration date and time parameter, then the set of valid generations is reduced to the number of latest
generations value. Otherwise, the parameter has no effect.
Exceptions to the reorganizational rule
There are two exceptions to the rule defined by the reorganization parameters:
• The newest migrated generation is always preserved, even if it contains only file header changes or
changes to a file alternate data stream.
• If no migrated generation (with file contents) is covered by the specified parameters, the latest
generation with file contents is preserved.
Handling deleted files
Files that were deleted from the HSM file system before the reorganizational scan job (either during
automatic deletion or manually) are handled in a special way. In certain situations, the exceptions above
are not valid for these files.
CAUTION: Files that had been deleted from the HSM file system and whose last “empty” generations are
not covered by the boundary migration date and time or the number of latest generations parameter are
not preserved during media reorganization. All migrated generations of such files are permanently lost.
Scanning media for obsolete data
You can run the scanning step of the reorganization process on all media belonging to a particular FSE
partition, using the following command:
NOTE: You can omit the time part (HH:mm:ss) of the ExpirationDate argument ("YYYY/MM/DD
HH:mm:ss"). In this case, the time 00:00:00 is assumed.
During the execution of the job, fsepartition reports the job execution progress to the standard output,
allowing you to monitor the scanning process in the command shell.
fsepartition --reorg-scan PartitionName "YYYY/MM/DD HH:mm:ss"
[NumberOfGenerations]