NEC 320Lb-R manual PCI Adapter Cards, Features of the Storage Bays and Hard Disk Drives

Table 1-9 summarizes the features of storage bays and hard disk drives.

Table 1-9. Features of the Storage Bays and Hard Disk Drives

Feature	Description
Disk drives	Hot pluggable and redundant.
Disk drive speeds	Disk drive spindle speeds of 10,000 RPM for 36Gb and 73GB storage capacity
and storage	disk drives; 15,000 RPM for 18GB storage capacity disk drives.
capacity
Disk drive carrier	Each disk drive is mounted in a disk drive carrier containing a handle, latching
	mechanism, and two status indicators. The status indicators are listed along
	with a description of each in Table 1-5.
Storage bays	The storage bays can contain any combination of disk drive carriers and
	dummy disk drive carriers as long as equivalent drives are mirrored.
	DO NOT remove dummy disk drive carriers from unused slots. They are
	present to direct airflow around the devices.

PCI Adapter Cards

For fault-tolerant systems the 32/64-bit PCI adapter cards must be installed in the PCI modules as redundant pairs. This is so that if a PCI card fails in one PCI module its equivalent PCI card in the other PCI module takes over the I/O operation without the processing being interrupted or having any loss of data or performance.

Located on the rear of each PCI module are PCI adapter-slot status LEDs that monitor the status of each PCI card. See Table 1-4 for a list and description of these PCI adapter-slot status LEDs.

1-24 System Overview