Administrator Guide

Table 43. Glossary of ME4 Series terms (continued)
Term Definition
SFTP SSH File Transfer Protocol. A secure secondary interface for installing firmware updates, downloading
logs, and installing security certificates and keys. All data sent between the client and server will be
encrypted.
SHA Secure Hash Algorithm.
shelf See enclosure.
sideplane A printed circuit board to which components connect longitudinally within an enclosure.
SLP Service Location Protocol. Enables computers and other devices to find services in a local area
network without prior configuration.
SMART Self-Monitoring Analysis and Reporting Technology. A monitoring system for disk drives that monitors
reliability indicators for the purpose of anticipating disk failures and reporting those potential failures.
SMC Storage Management Console. The web application that is embedded in each controller module and is
the primary management interface for the storage system.
SMI-S Storage Management Initiative - Specification. The SNIA standard that enables interoperable
management of storage networks and storage devices.
The interpretation of CIM for storage. It provides a consistent definition and structure of data, using
object-oriented techniques.
SMI-S is not supported for a system with 5U84 enclosures.
snapshot A point-in-time copy of the data in a source volume that preserves the state of the data as it existed
when the snapshot was created. Data associated with a snapshot is recorded in both the source
volume and in its associated snap pool. A snapshot can be mapped and written to. Snapshots that can
be mapped to hosts are counted against the snapshot limit, whereas transient and unmappable
snapshots are not.
snapshot tree A group of virtual volumes that are interrelated due to creation of snapshots. Since snapshots can be
taken of existing snapshots, volume inter-relationships can be thought of as a “tree” of volumes. A
tree can be 254 levels deep. See also base volume, child volume, parent volume, source volume.
SNIA Storage Networking Industry Association. An association regarding storage networking technology
and applications.
source volume A volume that has snapshots. Used as a synonym for parent volume. SSD Solid-state drive.
SSH Secure Shell. A network protocol for secure data communication.
SSL Secure Sockets Layer. A cryptographic protocol that provides security over the internet.
standard volume A volume that can be mapped to initiators and presented as a storage device to a host system, but is
not enabled for snapshots.
Storage Controller See SC.
storage system A controller enclosure with at least one connected expansion enclosure. Product documentation and
interfaces use the terms storage system and system interchangeably.
syslog A protocol for sending event messages across an IP network to a logging server. This feature
supports User Datagram Protocol (UDP) but not Transmission Control Protocol (TCP).
thin provisioning A virtual-storage feature that allows actual storage for a virtual volume to be assigned as data is
written, rather than storage being assigned immediately for the eventual size of the volume. This
allows the storage administrator to overcommit physical storage, which in turn allows the connected
host system to operate as though it has more physical storage available than is actually allocated to it.
When physical resources fill up, the storage administrator can add storage capacity on demand.
tier A homogeneous group of disks, typically of the same capacity and performance level, that comprise
one or more virtual disk groups in the same pool. Tiers differ in their performance, capacity, and cost
characteristics, which forms the basis for the choices that are made with respect to which data is
placed in which tier. The predefined tiers are:
178 Glossary of terms