SSS PTS SNIA Technical Position 17
Version 2.0.1
2 Definitions, symbols, abbreviations, and conventions
2.1 Definitions
2.1.1 ActiveRange: Specified as ActiveRange(start:end), where “start” and “end” are
percentages. ActiveRange (AR) is the range of LBA’s that may be accessed by the pre-
conditioning and/or test code, where the starting LBA# = start%*MaxUserLBA and the
ending LBA# = end%*MaxUserLBA.
2.1.2 Cache: A volatile or non-volatile data storage area outside the User Capacity that may
contain a subset of the data stored within the User Capacity.
2.1.3 Client: Single user desktop or laptop system used in home or office.
2.1.4 CPU Usage: amount of time for which a central processing unit (CPU) is used for
processing instructions. CPU time is also measured as a percentage of the CPU's
capacity at any given time.
2.1.5 Data Excursion: As used in the definition of Steady State, shall be measured by taking
the absolute value of the difference between each sample and the average.
2.1.6 Enterprise: Servers in data centers, storage arrays, and enterprise wide / multiple user
environments that employ direct attached storage, storage attached networks and tiered
storage architectures.
2.1.7 Client: laptop or desktop computers used in small office, home, mobile, entertainment
and other single user applications.
2.1.8 Fresh Out of the Box (FOB): State of SSS prior to being put into service.
2.1.9 IO Demand: Measured # of OIOs executing in the host.
2.1.10 Logical Block Address (LBA): The address of a logical block, i.e., the offset of the block
from the beginning of the logical device that contains it.
2.1.11 Latency: The time between when the workload generator makes an IO request and when
it receives notification of the request’s completion.
2.1.12 MaxUserLBA: The maximum LBA # addressable in the User Capacity.
2.1.13 Measurement Window: The interval, measured in Rounds, during which test data is
collected, bounded by the Round in which the device has been observed to have
maintained Steady State for the specified number of Rounds (Round x), and five Rounds
previous (Round x-4).
2.1.14 Nonvolatile Cache: A cache that retains data through power cycles.
2.1.15 Outstanding IO (OIO): The number of IO operations issued by a host, or hosts, awaiting
completion.
2.1.16 OIO/Thread: The number of OIO allowed per Thread (Worker, Process)
2.1.17 Over-Provisioned Capacity: LBA range provided by the manufacturer for performance
and endurance considerations, but not accessible by the host file system, operating
system, applications, or user.
2.1.18 Pre-conditioning: The process of writing data to the device to prepare it for Steady State
measurement.
(a) Workload Independent Pre-conditioning (WIPC): The technique of running a
prescribed workload, unrelated to the test workload, as a means to facilitate convergence
to Steady State.
(b) Workload Dependent Pre-conditioning (WDPC): The technique of running the test
workload itself, typically after Workload Independent Pre-conditioning, as a means to put
我的内容管理
展开
