User's Manual

hp StorageWorks File System Extender User Guide 257
deletion policy A set of rules that define expiration periods for groups of directories on an HSM file system.
Files which are older than the expiration period defined by the corresponding deletion policy
can be automatically deleted using the fsefile command. Configuration parameters for the
deletion policy are specified in the FSE partition configuration file. Each FSE partition has its
own deletion policy.
dirty file A file on an HSM file system which has been recently created and not yet migrated, or a file
that has changed since the last migration or recall.
disabled drive An FSE drive which is temporarily put out of operation and cannot be used by migration, recall,
administrative, maintenance and recovery jobs. This is done by changing its status in the
Resource Management Database to “disabled”. The status is set by an FSE administrator with
the fsedrive command. The example situation that calls for disabling the drive is when it
needs cleaning or servicing.
disk buffer
(FSE disk buffer)
Disk space used to hold temporary files processed during migration, recall, and reorganization
jobs. Temporary files are removed after they are written to the FSE media (migration), after they
are recreated on the HSM file system (recall), and after the recycled medium volumes are
initialized (reorganization). Usually, a separate logical volume or disk partition is allocated for
the FSE disk buffer. Temporary FSE disk buffer files are managed by the Back End Agent, and
are located in the directory /var/opt/fse/diskbuf (on Linux platform) or in the directory
%InstallPath%\var\diskbuf (on Windows platform).
disk media pool
(FSE disk media pool)
An FSE disk media pool is a special type of FSE media pool where the migrated data is stored
on disks rather than on tape media. FSE disk media therefore emulate FSE tape media, with the
advantage of being much faster for migrations and recalls. Using and managing FSE disk
media pools is similar to using and managing FSE tape media pools. See also ”media pool
(FSE media pool)”.
disk medium
(FSE disk medium)
A disk medium is one file system mounted to a subdirectory of the directory
/var/opt/fse/dm (on Linux platform) or the directory %InstallPath%\var\dm (on
Windows platform). Disk media emulates tape media and is used for regular archiving of the
data on HSM file systems. The advantage of using disk media is in shortened recall of offline
files. See also ”medium (FSE medium)”.
drive
(FSE drive)
A tape drive inside the FSE library, configured to be used by the FSE implementation.
duplication See ”media duplication”.
enabled drive An FSE drive which is put back in operation by changing its status in the Resource
Management Database to “enabled”. This status is set manually using the fsedrive
command. An enabled drive is fully available for FSE system operation.
erroneous drive An FSE drive which is temporarily put out of operation and cannot be used by migration, recall,
administrative, maintenance and recovery jobs. Its status is automatically set in the Resource
Management Database to “erroneous” as soon as the problems in the drive are detected by the
Back End Agent. Usually, such problems occur when the drive needs servicing.
error log
(FSE error log)
A file that records error messages of the running FSE processes. It stores information on all
major errors that occur during FSE system operation. These errors often require an intervention
of the FSE administrator. Major errors are, for example, failed initialization of an FSE medium,
erroneous FSE drive operation, migration job failure, and so on. The FSE error log also provides
usage statistics that can be used for fine tuning of the FSE configuration. The FSE error log,
named error.log, is located in the directory /var/opt/fse/log (on Linux platform) or in
the directory %InstallPath%\var\log (on Windows platform).