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12 IBM Netfinity EXP300 - Type 3531 Hardware Maintenance Manual
Netfinity EXP300 bays
The following sections describe the hot-swap CRUs, the switch card bay, and the
bridge card bay on the Netfinity EXP300 expansion unit.
With the hot-swap features of the Netfinity EXP300, you can remove and replace hard
disk drives, power supplies/fans, and ESM boards without turning off the expansion
unit. Therefore, you can maintain the availability of your system while a hot-swap
device is removed, installed, or replaced.
Hot-swap drive bays
The following illustration shows the location of the hot-swap drive bays accessible
from the front of your expansion unit. The Netfinity EXP300 supports up to 14 IBM
Ultra160 SCSI or Ultra2 SCSI hard disk drives. These drives come pre installed in a
drive tray. The drive and tray assembly is called a drive CRU (customer replaceable
unit). You can install the drive CRUs in the 14 drive bays on the front of the expansion
unit.
In the following figure, seven of the 14 bays contain drive CRUs, and seven bays
contain filler panels. To maintain proper cooling within your expansion unit, always
keep a filler panel in each drive bay that does not contain a drive CRU. For
information on installing and replacing drive CRUs, refer to “Working with hot-swap
drives” on page 17.
Attention: Never hot-swap a drive CRU when its green activity light emitting diode
(LED) is flashing. Hot-swap a drive CRU only when its amber fault LED is lit (not
flashing) or when the drive is inactive with the green activity LED off (not flashing).
Bridge card bay
The bridge card is accessible from the front of the unit. You can replace the bridge card
CRU but you must turn off the expansion unit before doing so. Refer to “Replacing a
bridge card” on page 22 for step-by-step instructions.
Important information for IBM ServeRAID:
If you are using a ServeRAID software version earlier than the Version 3.50, the
View Configuration screens might show SCSI IDs or bay numbers. If the data
shown on the View Configuration screen begins with 0, it denotes SCSI IDs. If the
data shown on the View Configuration screen begins with 1, it denotes bay
numbers.
Hot-swap drive bays
Filler panel
Bridge card bay