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AMASS Overview
GL-10 Glossary 6-00026-01 Rev A
storage policy
DataMgr migrates files using storage
policies, including Single Copy,
Multi-tier Migration, and File
Replication.
striping
The UNIX operating system allows
AMASS to cache data across multiple
magnetic disks on the server or across
partitions on a single magnetic disk on
the server. This feature improves
AMASS throughput. AMASS divides
the data into segments (stripes) and
writes each segment either to multiple
disks or to partitions on a disk. These raw
disks or raw partitions are defined as
cache space names with the AMASS
installation script. See also cache.
stub file
DataMgr leaves a stub file on a file
system after the original file has been
migrated to AMASS. The original file is
truncated (stubbed) to the smallest
allocatable disk block on the file system
and its contents is replaced with all the
information necessary to access the
migrated file.
T
TCP/IP
Transmission Control Protocol/Internet
Protocol. Runs on top of Ethernet to
provide high-level networking services
to applications. See also IP address.
thrashing
Unnecessary movement of the library’s
robotics. For example, retrieving disc 1,
then disc 6, then 1, then 6. Thrashing
causes access delays and premature
hardware failure.
truncate
Remove the file data blocks from disk,
leaving the inodes on disk. Only files that
remain unchanged since the last storage
to media can have their data blocks
truncated from disk. A FileServ-specific
term.
U
UNIX
™
A computer operating system that runs
on workstations, servers, mainframes,
and supercomputers.