HP File System Extender (FSE) manual Deletion, Default recall policy, Automatic deletion process

Recall timeout (RecallTimeout)

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.

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Lifecycle Management (ILM) environment made necessary by legal requirements, or for freeing disk space of redundant, out-of-date files.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.

HP StorageWorks File System Extender Software user guide 137