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2-24 Operating Tasks 600716 Rev A
File spanning is enabled or disabled for each DataClass group
by the
fsaddclass command. The fsmodclass allows
modification of DataClass group processing parameters while
the
fsfileinfo command reports all the locations of the
spanned file.
Clustering
FileServ supports file clustering. File clustering is the
accumulation of files associated with a DataClass group. When
these files are stored on media, they are seen as one logical file.
Any file in a cluster is retrieved as any other non-clustered
FileServ file.
File clustering can be defined when adding a DataClass group
to the file system (
fsaddclass)orbythefsmodclass
command. File clustering offers two advantages over individual
file storage. The first advantage is the media space saved when
clustering. The amount of space consumed by a cluster of files
is less than the space used if files are stored individually. The
second advantage is that the amount of time to store a cluster of
files is less than the sum of the time required to store each file
separately in the cluster. Clustered file information is sent in
one continuous stream of data to the drive for storage on media.
Unclustered files require the drive to stop, insert tape marks,
file labels, and perform database updates for each file, which
results in increased storage time.
The system administrator controls the maximum size of the
files to be clustered and the clustered file size for all supported
media types.