Redundant And Non-Redundant Components; Single Point Of Failure; Sfp Transceivers, Fiber-Optic Cables, And Copper Cables - Quantum StorNext QD7000 Hardware Manual

10 | Hardware Cabling Guide
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system.
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Redundant and non-redundant components

In storage area network technology, redundancy means that essential services are implemented using
duplicated components in such a way that if one component fails, an alternative component continues
to provide the service. This redundancy ensures the availability of data in case a component fails.
In most RAID systems, most of the components are redundant, but the system might not be fully
redundant. In other words, there might be one or two components whose individual failures would
cause loss of access to data. Therefore, a
configured to make sure that the duplicate components can be accessed in case of a failure. The
manner in which the system is cabled is an essential component of creating a successfully configured
redundant system.

Single point of failure

Any component or path that is not duplicated (redundant) or whose failure can cause loss of data
access is called a potential
components that present a potential single point of failure. Choose a cabling topology that does not
create a single point of failure.

SFP transceivers, fiber-optic cables, and copper cables

Fibre Channel host connections use fiber-optic cables while InfiniBand host connections use either
fiber-optic or copper cables. If your system will be connected with Fibre Channel or InfiniBand fiber-
optic cables, you must install an active SFP transceiver (for Fibre Channel) or QSFP transceivers (for
InfiniBand) into each port in which a fiber-optic cable will be connected before you plug in the fiber-
optic cable. Connections for 10-Gb/s iSCSI use copper or optical cables with SFP transceivers.
Connections for 1-Gb/s iSCSI use copper cables with RJ-45 connectors and do not require SFP
transceivers. Connections for SAS use copper or optical cables with SFF 8088 or SFF 8644
connectors and do not require SFP transceivers.
The following figures show the two types of cables that use SFP transceivers. Note that your SFP
transceivers and cables might look slightly different from the ones shown. The differences do not
affect the performance of the SFP transceivers.
Risk of exposure to laser radiation – Do not disassemble or remove any part of a
Warning:
Small Form-factor Pluggable (SFP) transceiver because you might be exposed to laser radiation.
1. Active SFP transceiver
2. Fiber-optic cable
SANtricity Power Guide for Advanced Users for your operating
fully redundant system duplicates all components and is
single point of failure . The cabling scenarios in this document note the