TeraStation III iSCSI User Manual
60
Glossary
Degraded Mode
When errors occur in a RAID 1, RAID 5, or RAID 10 array
because of a failing drive, the array enters degraded
mode to limit data loss. Performance will be lowered,
and though the array will try to maintain data integrity
if possible, data may be lost anyway. For best results,
replace the failing drive as soon as possible.
DHCP (Dynamic Host Configuration Protocol) Server
A DHCP server manages network configuration
information for all the devices on a network. If a
compatible client device is connected to the network,
the DHCP server will automatically assign necessary
network information such as IP address, subnet
mask, gateway to the device. With a DHCP server on
the network, you don’t have to configure network
information for each device manually.
Firewall
A firewall is a network device that is designed to block
unauthorized access while permitting authorized
communications. It may be hardware, or software,
or both. It will permit, deny, or proxy traffic between
domains based on rules and other criteria.
Gateway
Device, computer or software which connects networks
together. Packets pass through gateways to travel
between networks.
Hot Spare
A hot spare is an extra hard drive that is connected as
a failover backup to increase reliability. When another
drive fails, the hot spare takes over its functionality
immediately.
Hot Swap
Hot swap components may be replaced without
shutting down or significantly interrupting the system.
IP Address
A unique IP address identifies each network device on
a subnet.
iSCSI (Internet Small Computer System Interface)
A communication protocol that allows SCSI device
communication over a gigabit Ethernet network.
Jumbo Frames
Ethernet communication with frames larger than the
standard 1518 bytes. Common jumbo frame sizes are
4102 bytes, 7422 bytes, and 9694 bytes.
MAC (Media Access Control) address
The unique physical address assigned to each network
card. It consists of 3 bytes for the vendor code
(manufacturer ID) and 6 bytes for the individual user
code. Ethernet sends and receives frames based on
this address.
NTP (Network Time Protocol)
A protocol to correct time via the network. It
periodically synchronize time settings with that of an
NTP server to correct the time.
Port Trunking
Port trunking (link aggregation) uses multiple network
connections in parallel to increase link speed and
redundancy.
RAID (Redundant Arrays of Inexpensive Disks)
A technology that allows computer users to achieve
high levels of storage reliability from low-cost hard
drives by arranging them into arrays for redundancy.
Many types of RAID are available, including the well
known RAID 1 and RAID 5.
Subnet mask
Subnet masks divide networks into groups of
computers that have common, designated IP address
routing prefixes.
TCP/IP (Transmission Control Protocol / Internet
Protocol)
The standard communication protocol for Ethernet
networks and the Internet. It is a combination of the
Summary of Contents for TeraStation III TS-IXL
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