EMC Symmetrix DMX-3 Product Guide
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Glossary
SRDF Symmetrix Remote Data Facility. SRDF consists of the microcode and
hardware required to support Symmetrix remote mirroring.
SSID For the Symmetrix DMX storage control emulations, this value
identifies the physical components of a logical DASD subsystem. The
SSID must be a unique number in the host system. It should be an
even number and start on a zero boundary.
stage The process of writing data from a disk drive to global memory. See
also promotion, destage.
storage control unit
(SCU)
The component in the Symmetrix subsystem that connects the
Symmetrix system to the host channels. It performs channel
commands and communicates with the disk directors and global
memory. See also channel director.
string A series of connected disk drives sharing the same disk director.
striping The process of segmenting logically sequential data and writing the
segments to multiple physical disk drives.
Symmetrix DMX Symmetrix Direct Matrix is the architecture of nonblocking direct
matrix interconnect design that supports up to 128 direct paths
through the Symmetrix DMX global memory directors for the
Symmetrix DMX systems.
synchronous
transmission
A timing protocol that uses a master clock with a clock period and
allowable offset that holds the sending and receiving devices in the
desired phase relationship.
T
target A SCSI device that performs an operation requested by an initiator.
terabyte (TB) The TB
2
value is based on the convention:
1 TB = 1024 * 1024 * 1024 * 1024 bytes.
The TB
10
value is based on the convention:
1 TB = 1000 * 1000 * 1000 * 1000 bytes.
Although these values are expressed differently, their values are
equivalent
.
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