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Glossary 3
195$0FDFKH
Nonvolatile RAM in the filer, used for
logging incoming write data and NFS
requests. Improves system performance
and prevents loss of data in case of a
filer or power failure.
195$0FDUG
Adapter card that contains the filers
NVRAM cache.
SDQLF
A serious error condition causing the filer
to halt; similar to a software crash in the
Microsoft
®
Windows
®
operating sys-
tem environment.
SDULW\ G LV N
Disk on which parity information is
stored for the RAID-4 disk drive array.
Used to reconstruct data in failed disk
blocks or on a failed disk.
3&,
Peripheral Component Interconnect. The
bus architecture used in newer filers.
3'&
Primary Domain Controller. The domain
controller that has negotiated to be, or
has been assigned as, the primary
authentication server for the domain.
3267
Power-on self-tests. The tests run by the
filer after the power is turned on.
39&
Permanent Virtual Circuit. A link with a
static route defined in advance, usually
by manual setup.
TWUHH
A directory on which you can impose
tree quotas, created by the
quota
qtree
command.
5$,'
Redundant arrays of independent disks.
A technique that protects against disk
failure by computing parity information
based on the contents of all the disks in
the array. The filer uses RAID Level 4,
which stores all parity information on a
single disk.
5$,'GLVNVFUXEELQJ
The process in which the system reads
each disk in the RAID group and tries to
fix media errors by rewriting the data to
another disk area.
6&6,DGDSWHU
An expansion card that supports the
SCSI disk drives and tape drives.
6&6,,'
The number of a disk drive on the SCSI
chain (0-6).
VHULDODGDSWHU
An expansion card for attaching a termi-
nal as the console on some filers.
VHULDOFRQVROH
An ASCII or ANSI terminal attached to a
filers serial port. Used to monitor and
manage filer operations.
VKDUH
A directory or directory structure on the
filer that has been made available to net-
work users and can be mapped to a drive
letter on a CIFS client.
6,'
Security identifier.
VQDSVKRW
An on-line, read-only copy of the entire
file system that protects against acciden-
tal deletions or modifications of files
without duplicating file contents. Snap-
shots enable users to restore files and
enable you to back up the filer to tape
while the filer is in use.