User's Manual

hp StorageWorks File System Extender User Guide 119
Configuring exclusion from release
After you have modified the FSE partition configuration template or an already used FSE configuration file
with a configured ExcludeFromRelease variable, you have to apply it by running the
fsepartition --add or the fsepartition --modify command, respectively. Potential syntax
errors in the ExcludeFromRelease parameter specification are immediately reported to the standard
command output.
For information on the fsepartition command, see the FSE Command-Line Reference.
Releasing excluded files
The files that have been excluded from release can be unconditionally released using the following
command:
You must run the command on the FSE client that hosts the chosen FSE partition.
For more information on the fsefile command, see the FSE Command-Line Reference.
Release policy parameters
The following are the configuration parameters for release along with their definition and impact. The
combination of these parameters allows a flexible configuration of release behavior.
Critical watermark (CriticalWaterMark)
High watermark (HighWaterMark)
Low watermark (LowWaterMark)
Release interval (ReleaseInterval)
fsefile --release FileName...
Definition The percentage of used disk space that triggers a forced release job.
Impact This parameter value should not be too low as it will result in frequent forced releases (it
should typically be above 95%).
Definition The percentage of used disk space that triggers a regular release job.
Impact Consider the value for acceptable occupation of disk space. If you set a low value, it will
result in numerous regular releases.
Definition The percentage of used disk space that stops the regular release job — the files below
the defined low watermark are not released and remain on the disk.
Impact Consider the value for disk space needed for the number of small files that should not be
released if you want to optimize the use of the FSE implementation.
Definition The frequency of the disk space checks for watermark conditions.
Impact Define this value according to the frequency of recalls and the size of the recalled files. If
this value is too high, for example 5 minutes, and you have constant recalls of large files,
the file system will be overloaded. Such occupation of disk space will make all recalls of
offline files impossible.