Silicon Graphics Total Performance 9300, User Manual

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Chapter 2
2. Storage Enclosures
The storage enclosure is the basic building block of the TP9300. Each storage enclosure
provides redundant power and cooling to its individual components. The storage
enclosures also house the I/O components of the storage system.
There are two types of storage enclosures: controller enclosures and expansion
enclosures. As their name implies, controller enclosures contain the RAID controllers for
the storage system. The expansion enclosures provide expansion disk drive space. The
two types of storage enclosures share many of the same components. The only difference
between controller enclosures and expansion enclosures is the presence or absence of the
RAID controllers.
This chapter describes the components in both the controller and expansion enclosures
in the following sections:
• “Overview” on page 12
• “Disk Drives” on page 16
• “RAID Controllers” on page 17
• “Environmental Status Modules (ESMs)” on page 19
• “Fans” on page 20
• “Power Supplies” on page 21
• “Tray ID Switch” on page 23
• “Link Rate Switch” on page 24
• “SFP Transceivers” on page 25