Dell PowerVault MD1000 SAS Solution Manuale - Pagina 13

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A REFERENCE GUIDE FOR OPTIMIZING DELL™ MD1000 SAS SOLUTIONS

External SAS Cables

Depending on the enclosure topology, one or two external SAS cables may be attached between

the host system(s) and the PowerVault MD1000 storage enclosure. SAS cables use four active 3

Gbps SAS lanes in a single cable to deliver an aggregate of 12.0 Gbps connection. All PowerVault

MD1000 SAS cables purchased from Dell have been tested and comply with the ANSI SAS 1.0

standard. Dell supports using only Dell-provided cables.

External SAS Connector Types

SAS uses a 25-pin connector whose specification is governed by the SFF-8470 specification. For

more information, refer to the specification referenced in Appendix A.

Regardless of the topology, the PowerVault MD1000 storage enclosure also provides some

common capabilities as listed below:

Redundancy Capabilities

Management Redundancy

•

With two EMMs installed, the PowerVault MD1000 storage enclosure's internal enclosure

functions on the PowerVault MD1000, such as temperature regulation, LED control, and

alarm control, are maintained in the event of an EMM failure. However, even with dual

EMMs installed, enclosure status will not be reported to the host in the event of an EMM

failure.

Power Supply and Cooling Redundancy

•

The PowerVault MD1000 storage enclosure requires that both power supplies be installed

for normal operation. The system can operate using a single power supply for a limited

time in the event a power supply fails or is removed for service.

The PowerVault MD1000 storage enclosure provides four individually controlled fans, two

installed in each power supply. The unit is thermally designed to continue operating in the

event of one fan blower failure (3+1 cooling redundancy). In the event of a fan failure, the

power supply containing the failed fan must be replaced.

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