User's Manual

HP StorageWorks File System Extender Software user guide 13
For further information on the recall process and its configuration, see chapter ”Migration, release, recall,
and deletion” on page 123.
Deletion
Deletion is a process of obsoleting and removing obsolete files from HSM file systems. You can use this
process for various purposes, including Information Lifecycle Management (ILM) and freeing disk space of
redundant files.
The criteria that induce file obsolescence on HSM file systems are defined in the deletion policy. Each HSM
file system has its own deletion policy. Deletion is enabled on regular and WORM HSM file systems.
For further information on deletion process and its configuration, see chapter ”Migration, release, recall,
and deletion” on page 123.
FSE components
HSM file system
An HSM file system (HSM FS) is a hard disk area reserved for storage of user files and directories (user
data), and managed by the FSE implementation. The HSM file system is used to store the metadata
(names, attributes, and permissions of user data) and user data that is currently online.
Linux specific
On Linux platform, HSM file system is based on the Ext3 file system; the HSM attributes are stored in Ext3
extended attributes.
Windows specific
On Windows platform, HSM file system is based on the NTFS.
In an FSE installation, an HSM file system represents the primary storage space, and the FSE media
represent the secondary storage space.
An HSM file system can be configured either as a regular file system or as a WORM file system:
• Regular file system
All files and directory operations are supported as known for the native file system of the respective
platform.
• WORM (Write-Once Read-Many) file system
File and directory operations are restricted to read-only after a configured period of time. The limitation
does not include adding files to directories, which can be done in the same way as on a regular file
system.
For details on configuring a WORM HSM file system, see ”Phase 4: configuring FSE partitions” on
page 73.
Hierarchical Storage Manager (HSM) is a component of the HSM file system. As a part of an FSE client, it
handles HSM file system events and manages the migration and release candidate lists. Each mounted
HSM file system has one FSE HSM.
In a distributed FSE implementation, the HSM file systems, their Hierarchical Storage Managers (HSMs),
and the File System Event Manager are located on external FSE clients.
FSE partition
FSE uses FSE partitions to split the storage into multiple entities, meaning that one FSE implementation can
have more than one FSE partition. This way FSE provides the possibility for a complex organization of data
management.
Each FSE partition is related to a single HSM file system and has its own policies and its own File System
Catalog (FSC). This enables you to configure individual policies (migration, release, deletion, and resource
allocation) for a particular FSE partition, according to the characteristics of files and their intended use.
Each configured FSE partition is controlled by one Partition Manager (PM), which creates and manages
FSE jobs for migration, recall, and deletion operations. The Partition Manager is located on the FSE server.
It is included in the FSE server installation package.