User's Manual

hp StorageWorks File System Extender User Guide 259
File System Event
Manager
A daemon/service on the FSE client which receives notification about mount events for the HSM
file system and triggers the startup of the appropriate Hierarchical Storage Manager. The File
System Event Manager process name is fse-fsevtmgr.
forced release Release of all files on an HSM file system, which are on the release candidate list, regardless of
their retention time and file size. Forced release is triggered when the critical watermark of
usage is reached on the HSM file system. The process is stopped in the moment when the high
watermark on the HSM file system is reached. See also ”release”.
formatting A process that partitions a medium into medium volumes, according to the parameters
specified in the FSE media pool configuration. During formatting all data on the medium is
erased. If an FSE medium contains valid FSE user data and you want to format it, you must use
forced formatting.
Full Access Mode
(FAM)
One of the two HSM file system filter operational modes. When HSM file system filter is
operating in Full Access Mode for a particular HSM file system, you are allowed to make
changes to the data located on the HSM file system, and use all the HSM file system
functionality that the FSE system provides. For example, you can create, rename, move or delete
directories and files, and change their data or metadata. In this mode, all data movement
processes (migration, release, recall, deletion) can be executed – by being either triggered
explicitly or started according to the configured FSE partition policies. See also ”Limited Access
Mode (LAM)”.
good medium An FSE medium in its fully operation state. This state lasts as long as the medium is in a good
condition, that is, no write and read errors are detected while writing data to and reading data
from the medium.
Hierarchical Storage
Management
Database (HSMDB)
A database with migration candidate and release candidate lists for files on the HSM file
system. Each FSE partition has its own Hierarchical Storage Management Database.
Hierarchical Storage
Management
Database journal
A file which contains transaction information for Hierarchical Storage Management Databases.
It is designed to increase the database robustness. HSMDB journals contain information about
already applied and pending database transactions. Hierarchical Storage Management
Database journals are located in the directory
/var/opt/fse/part/PartitionName/hsm/journal (on Linux platform) or in the
directory %InstallPath%\var\part\PartitionName\hsm\journal (on Windows
platform).
Hierarchical Storage
Manager (HSM)
A part of the FSE client that handles file system events relevant for the FSE implementation and
enforces migration, release, and recall policies. The Hierarchical Storage Manager process
name is fse-hsm.
Hierarchical Storage
Manager list (HSM
list)
A list of files, maintained by the Hierarchical Storage Manager, which are candidates for
migration or release. HSM lists are: a dirty file list (the list of changed files), a migration
candidate list, and a release candidate list.
high watermark A user-defined value for the high level of disk space usage on an HSM file system. When this
value is reached, a regular release process is started for all files that are on the Hierarchical
Storage Manager's release candidate list and that have passed their migration or recall
retention period, and are larger than the defined MinFileSize.
host
(FSE host)
A computer system that hosts either a consolidated FSE implementation, an FSE server, or an
FSE client.
HSM file system
(HSM FS)
A file system, controlled by the FSE software. It is used to store file metadata (name, attributes,
permissions) and online files of an FSE partition. HSM file systems represent the primary
storage space of an FSE implementation. On Linux platform, HSM file systems are based on the
Linux native Ext3 file system and FSE specific attributes are stored as Ext3 extended attributes.
On Windows platform, HSM file systems are based on the Windows native NTFS file system.