User's Manual

HP StorageWorks File System Extender Software user guide 137
Recall timeout (RecallTimeout)
NOTE: Having multiple media copies can speed up file recalls, since any copy can be used for recall. For
further information on multiple copying, see ”Multiple copying” on page 147.
Default recall policy
Default recall policy is defined in the FSE configuration template for FSE partition configuration. For details,
see ”Template for FSE partitions - Recall and Allocation part” on page 305.
Deletion
FSE provides the ability to delete files from HSM file systems. You can use this feature for various purposes,
such as in an Information Lifecycle Management (ILM) environment made necessary by legal requirements,
or for freeing disk space of redundant, out-of-date files.
Automatic deletion process
Automatic deletion is a process executed on an FSE partition. The process is controlled and performed by
a special type of FSE job: the deletion job. You configure FSE deletion jobs by specifying a deletion policy
in each FSE partition configuration file. The deletion policy determines the files considered for deletion and
the criteria that determine when they can be deleted. Although deletion is an automatic process, it can
only be started on an FSE user’s request.
The automatic file deletion process consists of two phases. When an FSE deletion job is initiated, it first
scans the File System Catalog (FSC) for files on the FSE partition and makes a list of the files that satisfy the
deletion policy criteria. This list is then passed to Hierarchical Storage Manager (HSM), which deletes the
files on the HSM file system.
NOTE: Automatic deletion is also supported on WORM HSM file systems. During deletion, the files are
deleted from the HSM file system. Afterwards, the deleted files are “migrated” to the WORM FSE media.
To trigger an FSE deletion job, run the fsefile command, specifying the name of the FSE partition on
which you want to run the deletion job. You can also set up a cron job or an automatic task and include
the fsefile invocation in it. This way, you can completely automate the file deletion tasks.
Linux specific
You can configure a regular cron job for this purpose.
Definition When an application requests an offline file, the RecallTimeout is the time frame
given to FSE for bringing the offline file back online. If FSE cannot bring the file online in
this time frame, the application is notified about it with an error message, but the recall
job continues to run in the background.
Impact This parameter only affects implicit recalls, and is ignored by recall jobs that are
triggered using the fsefile command.
Set the parameter value according to the expected load of the FSE implementation. The
value can be low if your system performance is optimized. If load of the FSE
implementation is significant and the parameter value is too high, the following may
happen:
• At a particular moment all FSE drives are in use.
• There are numerous jobs with higher priorities already running.
• The required medium cannot be found, because it is offline.
In any of the above cases, the recall job fails and Hierarchical Storage Manager notifies
the application or user that the file cannot be recalled.