Installing SAS controllers or controller enclosures.............................................................................33
Preparing the server...........................................................................................................................33
Connecting SAS cables and power cords..........................................................................................34
Overview........................................................................................................................................34
Cabling best practices...................................................................................................................34
Connecting SAS cables to the server or controller enclosure.......................................................35
Connecting SAS cables to cascaded disk enclosures..................................................................36
Connecting power cords................................................................................................................37
configuration...............................44
configuration................................45
Dual domain example — best fault tolerance cabling........................................................................46
Dual domain — best performance cabling.........................................................................................47
Dual domain—alternative cabling.......................................................................................................48
Is the enclosure front fault LED amber?........................................................................................49
Is the enclosure rear fault LED amber?.........................................................................................50
Is the System Health LED amber?................................................................................................50
Is the power supply LED amber?..................................................................................................50
Is the I/O module fault LED amber?..............................................................................................50
Is the fan LED amber?...................................................................................................................51
Effects of a disk drive failure..........................................................................................................52
Compromised fault tolerance.........................................................................................................52
Factors to consider before replacing disk drives...........................................................................52
Automatic data recovery (rebuild).................................................................................................53
Time required for a rebuild.......................................................................................................53
Failure of another drive during rebuild.....................................................................................54
Handling disk drive failures......................................................................................................54
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Contents