NetApp StorageGRID Webscale 10.4 Installation And Maintenance Manual page 59

LDR service
Local Distribution Router. The LDR service manages the storage and transfer of content
within the StorageGRID Webscale system. The LDR service is present on the Storage
Node.
LUN
See object store .
mDNS
Multicast Domain Name System. A system for resolving IP addresses in a small network
where no DNS server has been installed.
metadata
Information related to or describing an object stored in the StorageGRID Webscale
system; for example, ingest time.
MLAG
Multi-Chassis Link Aggregation Group. A type of link aggregation group that uses two
(and sometimes more) switches to provide redundancy in case one of the switches fails.
MTU
Maximum transmission unit. The largest size packet or frame that can be sent in any
transmission.
namespace
A set whose elements are unique names. There is no guarantee that a name in one
namespace is not repeated in a different namespace.
nearline
A term describing data storage that is neither "online" (implying that it is instantly
available, like spinning disk) nor "offline" (which can include offsite storage media). An
example of a nearline data storage location is a tape that is loaded in a tape library, but is
not mounted.
NFS
Network File System. A protocol (developed by SUN Microsystems) that enables access
to network files as if they were on local disks.
NMS service
Network Management System. The NMS service provides a web-based interface for
managing and monitoring the StorageGRID Webscale system. The NMS service is present
on the Admin Node. See also,
node ID
An identification number assigned to a service within the StorageGRID Webscale system.
Each service (such as an NMS service or ADC service) must have a unique node ID. The
number is set during system configuration and tied to authentication certificates.
NTP
Network Time Protocol. A protocol used to synchronize distributed clocks over a variable
latency network, such as the Internet.
object
An artificial construct used to describe a system that divides content into data and
metadata.
object segmentation
A StorageGRID Webscale process that splits a large object into a collection of small
objects (segments) and creates a segment container to track the collection. The segment
container contains the UUID for the collection of small objects as well as the header
Admin Node .
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