User's Manual

hp StorageWorks File System Extender User Guide 15
In a distributed FSE implementation, HSM file system, its HSM, and the File System Event Manager are
located on a separate FSE client.
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 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.
File System Catalog
The File System Catalog (FSC) is a database related to a single FSE partition. It consists of a Data Location
Catalog (DLC) and a Name Space Catalog (NSC).
The Data Location Catalog contains information about location of files on the FSE media. It stores a full
history of file locations.
The Name Space Catalog (NSC) contains metadata of files on an HSM file system. It only stores the latest
generation metadata, which includes directory structure, standard attributes and additional
platform-dependent metadata. This data enables recovery of an HSM file system. For details, see
”Recovery” on page 186.
Linux specific
For HSM file systems located on Linux FSE clients, NSC also stores ownership information of directories and
files.
Windows specific
For HSM file systems located on Windows FSE clients, NSC also stores ACLs (Access Control Lists) and
Alternate Data Streams for user data.
The File System Catalog location is platform-dependent.
Linux specific
File System Catalog is located in the /var/opt/fse/part/PartitionName/fsc directory.
Windows specific
File System Catalog is located in the %InstallPath%\var\part\PartitionName\fsc directory.
The value of %InstallPath% depends on the choice made in the FSE installation process. It defaults to
C:\Program Files\Hewlett-Packard\FSE.
FSE media pool
An FSE partition must have at least one media pool assigned to it. An FSE media pool is configured to
group media of the same type, which have the same characteristics.
Media pools are configured regarding their purpose and correspond to the specifics of FSE partition data
and FSE media types, for example, a WORM or regular disk media pool. Therefore, one media pool
cannot be assigned to multiple partitions in order to keep the files from different FSE partitions separated.
An FSE partition can have assigned multiple media pools which have to be of the same type: "Regular" or
"WORM".
By assigning multiple media pools to one FSE partition, multiple copies of FSE data are made. This kind of
FSE partition configuration is described in ”Multiple copying” on page 131. For more information on
media pool types and their configuration, see ”FSE media pools” on page 81.