SNIA Online Dictionary

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OASIS	[General] The Organization for the Advancement of Structured Information Standards. See https://www.oasis-open.org.
object	[General], [Data Management], [Data Security] [General] An instantiated instance of a class in an Object Oriented system. [Data Security] In the context of access control, an entity such as an information system resource to which access is controlled and/or usage of which is restricted to authorized subjects. [Data Management] The encapsulation of data and associated metadata.
object drive	[Storage System] A storage element that directly provides object services.
object service	[Storage System] Object-level access to storage.
object storage	[Storage System] A storage device that provides object services. Object storage includes DSaaS.
object-oriented	[General] A methodology for decomposing an entity or problem by its key abstractions, versus by its procedures or steps. The key abstractions become classes in an information or data model, and embody well-defined behaviors called methods, with a unique set of data attributes. An instance of a class is an object.
OC-n	[Network] An optical carrier data rate that is a multiple of the fundamental SONET rate of 51.84 Mbits/sec. OC-3 (155 Mbits/sec), OC-12 (622 Mbits/sec), OC-48 (2488 Mbits/sec) and OC-192 (9953 Mbits/sec) are currently in common use. See Asynchronous Transfer Mode.
OData	[Management] The Open Data Protocol. OData is an OASIS standard protocol that enables the creation and consumption of RESTful APIs.
OData service	[Management] A service conforming to the OData standard. OData allows resources, identified using Uniform Resource Locators (URLs) and defined in a model, to be published and edited by Web clients using simple HTTP messages.
offline backup	[Data Recovery] A form of backup in which the data being backed up is not accessed by applications for the duration of the backup.
offline data	[Data Management] Data that may not be accessible for an extended period of time, for example data on removable media at a remote site. See near-online data.
OM1	[Network] A designation for a multimode optical fiber with a 62.5 micrometer core diameter and a bandwidth-length product of 200 MHz*km for 850 nm optical signals. This fiber is typical of FDDI installations. Specified by ISO 11801 second edition.
OM2	[Network] A designation for a multimode optical fiber with a 50 micrometer core diameter and a bandwidth-length product of 500 MHz*km for 850 nm optical signals. This fiber is typical of 1 Gb/s Ethernet and Fibre Channel installations. Specified by ISO 11801.
OM3	[Network] A designation for a multimode optical fiber with a 50 micrometer core diameter and a bandwidth-length product of 2000 MHz*km for 850 nm optical signals. Specified by ISO 11801.
OM4	[Network] A designation for a multimode optical fiber with a 50 micrometer core diameter and a bandwidth-length product of 4700 MHz*km for 850 nm optical signals. Specified by ISO 11801.
OM5	[Network] A designation for a multimode optical fiber with a 50 micrometer core diameter and a bandwidth-length product of 4700 MHzkm for 850 nm optical signals and a bandwidth-length product of 2470 MHzkm for 953 nm optical signals. Specified by ISO 11801.
online backup	[Data Recovery] A form of backup in which the data being backed up may be accessed by applications during the backup. Online backup of a set of data is usually accomplished using a frozen image of the data.
Op/s	[Storage System] Operations per second. This is similar to IOPS but includes non-read and non-write operations (e.g., NFS SETATTR call, SCSI TEST UNIT READY). Op/s is the preferred term as opposed to OPS or OPs since these terms are more often associated with the plural operations.
Open Group	[General] An organization for open systems standards and their certification. UNIX, management, and security standards are developed within the Open Group, homed at www.opengroup.org.
open interconnect	[Computer System] Synonym for standard interconnect.
operating environment	[Computer System] A collective term for the hardware architecture and operating system of a computer system.
operational	The condition of a receiver that is capable of receiving an encoded bit stream based on the rules defined by FC-FS-2 for the FC receiver state machine.
Operational Recovery	[Data Recovery] Recovery of one or more applications and associated data to correct operational problems such as a corrupt database, user error or hardware failure. Operational recovery may use a point in time copy or other techniques that create a consistent set of recoverable data.
optical fall time	[Network] The time interval required for the falling edge of an optical pulse to transition between specified percentages of the signal amplitude.
optional characteristics	[Standards] Characteristics of a standard that are specified by the standard but not required for compliance, but which, if implemented, must be implemented as defined in the standard.
Ordered Set	[Fibre Channel] A transmission word with a special character in its most significant position and data characters in the remaining three positions. An Ordered Set is identified by the combination of special codes and data bytes that, when encoded, result in the generation of the transmission characters specified for the ordered set. Ordered Sets are used for low-level Fibre Channel link functions such as frame demarcation, signaling between the ends of a link, initialization after power on, and some basic recovery actions.
Originator	[General], [Fibre Channel] 1. [General] In a negotiation, the party that initiates the negotiation. 2. [Fibre Channel] With reference to an Exchange, the Nx_Port that sent the frame that caused the Exchange to become open.
Originator Exchange_Identifier	[Fibre Channel] An identifier assigned by an Exchange Originator to identify an Exchange.
OSD	[Storage System] Acronym for Object Storage Device.
out-of-band	[Network] A separate data stream sent over a different protocol than the primary data stream. An example is management information. See in-band.
out-of-band data deduplication	[Storage System] Deprecated synonym for post-process data deduplication.
over provisioning	[Storage System], [Management] Purposely providing more capacity than advertised. The over provisioned capacity is used to replace capacity that is no longer useable (e.g., due to media defects or wear out). The over provisioned capacity is reserved for controller use, is not addressable by the user, and is used to improve performance and device life.
oversubscription	[Computer System] A property where more services are requested than are able to be delivered.
overwrite procedure	[Data Security] A process of writing patterns of data on a medium for the purpose of obliterating data that was formerly stored there. See purge.
OX_ID	[Fibre Channel] Acronym for Originator Exchange_Identifier.