LUN. LUNs can be exposed over iSCSI and
Fibre Channel. When associated with an iSCSI
target, a LUN forms a unique iSCSI block device
that can be accessed by one or more iSCSI
initiators. When exposed to the common Fibre
Channel target on the , a LUN forms a block
device identified by a unique HBA port WWN
that can be accessed by one or more FC
initiators.
M
Management target
Each storage pool on the has a Management
target (mgmt) assigned to it by the system, by
default. The management target allows a VSS
(Volume Snapshot Service or Volume Shadow
Copy Service) host to create and manipulate
shadow copies (point-in-time snapshots) of the
data in LUNs on the . The VSS host connects to
a storage pool’s Management target via iSCSI to
view, create, and manage snapshots of the
LUNs in the storage pool. You can assign a
CHAP (Challenge Handshake Authentication
Protocol) user to the Management target to
restrict access to LUN snapshots in a storage
pool, to specific VSS hosts.
Manual replication
In asynchronous replication, an offline, or
manual, replication is a replication process that
you start manually on a storage pool. With offline
replication, you can replicate the data in the
storage pool to the remote , or to a USB storage
device attached to the primary .
Mb
Megabit. Approximately one million (1,000,000)
bits.
Mb/s
(Megabits (Mb) per second) Used to describe the
speed of network data transmission.
MPIO (Multipathing I/O)
MPIO is designed to provide multiple paths to
SAN storage. It provides connection failover and
load balancing benefits to strengthen the stability
of a network storage environment.
N
NAS
(Network-attached storage) File-level computer
data storage connected to a computer network
providing data access to clients on the network.
Network-attached storage uses specialized
hardware, software, or both, and is often a
specialized device built from the ground up for
storing and serving files.
NDMP
(Network Data Management Protocol) Protocol
used to transport data between network attached
storage (NAS) devices and backup devices. This
removes the need for transporting the data
through the backup server itself, thus enhancing
speed and removing load from the backup
server.
NetBIOS
(Network Basic Input/Output System) API that
allows applications on separate computers to
communicate over a local area network.
NetBIOS offers 3 services: Name service (UDP
port 137), Datagram distribution service (UDP
port 138). and Session service (TCP port 139).
NFS
(Network File System) A protocol allowing a user
on a client computer to access files over a
network in a manner similar to how local storage
is accessed. Used in most UNIX environments
for folder or device sharing.
NIS
(Network Information Service) One of the three
UNIX directory services supported by the . NIS
is a client–server directory service protocol for
distributing system configuration data such as
user and host names between computers In a
UNIX network environment. It was originally
called Yellow Pages or YP. A NIS/YP system
maintains and distributes a central directory of
user and group information, host names, e-mail
Glossary
Nexsan Unity Hardware Reference Guide
www.nexsan.com
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