Dell PowerVault ML6000 Maintenance Manual page 493

snapshot
A rapid, point-in-time image of a volume created initially on the same disk as the original by duplicating
metadata rather than copying the full data set. Snapshots are often used to protect against data corruption
(viruses, etc.) or to create test or pre-production environments. Snapshots are also often used as a first step
for creating non-disruptive point-in-time backups, and for copying data sets to a second disk to create a full
duplicate copy of the volume. Snapshots are created on disk, and in the same format as the original data.
Snapshots are also referred to as point-in-time copies and as shadow copies.
SNMP (Simple Network Management Protocol)
The protocol governing network management and the monitoring of network devices and their functions.
Similar in function to SAM, except SNMP governs LAN, whereas SAM governs SAN.
SSL (Secure Sockets Layer)
A protocol that provides encrypted communications on the Internet. SSL is layered beneath application
protocols such as HTTP, SMTP, Telnet, FTP, Gopher, and NNTP and is layered above the connection
protocol TCP/IP.
storage device
An appliance containing data that can be accessed, added to, changed, or deleted by the user. The storage
media types include tapes and optical disks. A storage device can be a single disk drive, or can constitute
thousands of tapes in a large tape library.
storage slot
The physical home where a data cartridge resides.
subsystem status
A feature that provides predictive alerts, warning of any loss of connectivity or device failure using local or
remote alerts. Subsystem status allows administrators to correct faults before they affect backup or other
data transfer operations.
tape drive
A device that spins disks and tapes while it reads and writes data in storage.
TCP/IP (Transmission Control Protocol/Internet Protocol)
The communications protocol used by the Internet. It runs on top of Ethernet to provide high-level
networking services to applications.
topology
The logical and/or physical arrangement of stations on a network.
trap
An SNMP alert that is sent when predefined conditions are met. For example, an error trap tests for an error
condition and provides a recovery routine.
UDS (universal drive sled)
The hardware that houses Fibre Channel and SCSI tape drives in a module.
user ID
An alphanumeric value that the password database associates with a login name. Also, UID.
WORM (write once, read many)
A common type of data storage medium, in which data can be read and reread, but not altered, after it has
been recorded.
WWNN (world wide node name)
A unique number assigned by a recognized naming authority. The world wide name is integral to Fibre
Channel operations.
WWPN (world wide port name)
The WWPN is a 64-bit, hard-coded address for each port on an FC-connected device. It is used to identify
available SAN devices at end points.
X-axis, X-position
The horizontal position of the library's robotic arm.
PowerVault ML6000 Maintenance Guide 475