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fibre channel
A gigabit-speed network technology primarily used for storage
networking.
firmware
Software embedded into a storage device. It may also be referred to as
Microcode.
full duplex
The concurrent transmission and the reception of data on a single link.
G
Gbps
Gigabit per second.
granularity of differential data
Refers to the size or amount of data transferred to the S-VOL during an
update cycle. Since only the differential data in the P-VOL is transferred
to the S-VOL, the size of data sent to S-VOL is often the same as that of
data written to the P-VOL. The amount of differential data that can be
managed per write command is limited by the difference between the
number of incoming host write operations (inflow) and outgoing data
transfers (outflow).
GUI
Graphical user interface.
I
I/O
Input/output.
initial copy
An initial copy operation involves copying all data in the primary
volume to the secondary volume prior to any update processing. Initial
copy is performed when a volume pair is created.
initiator ports
A port-type used for main control unit port of Fibre Remote Copy
function.
IOPS
I/O per second.
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Hitachi Simple Modular Storage Copy-on-Write SnapShot User's Guide
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Glossary–7
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