Clustering Support; Getting Help On The World Wide Web; Netfinity Exp300 Bays; Hot-Swap Drive Bays - IBM Netfinity EXP300 Installation And User Manual

Clustering support

Getting help on the World Wide Web

Netfinity EXP300 bays

Hot-swap drive bays

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IBM® Netfinity® EXP300 Installation and User's Guide
Clustering is a feature of the expansion unit. Clustering is a means of sharing SCSI
buses and disk drives among SCSI controllers to provide redundancy of SCSI
controllers and servers. This redundancy is important if a hardware component fails.
If a hardware component fails after clustering has been set up, another server will
take ownership of the disk drives or SCSI bus.
The IBM Netfinity EXP300 supports twin-tailed clustering. With twin-tailed
clustering, you can connect two IBM ServeRAID
unit. In the twin-tailed clustering environment, you can use dual-host controllers
cabled separately to the EXP300 expansion unit; however, only a single logical bus of
13 drives is supported. Each SCSI device on a SCSI bus must have a unique ID. To
prevent conflicts in a twin-tailed configuration, do not install a drive in the bay that
uses SCSI ID 6 because your secondary SCSI ServeRAID controller is set to 6.
Service tip: If you use IBM ServeRAID controllers in a cluster configuration, the
termination power LED on the back of the expansion unit is useful. The ServeRAID
controller provides the signal for termination power. If the termination power LED is
not lit, it indicates that a particular EXP300 expansion unit is not attached to a
controller that is turned on. Make a note of which EXP300 expansion unit is attached
to which server before the hardware is serviced.
Clustering requires additional hardware and specialized software. For more
information, visit the IBM Netfinity Cluster Solutions Web site at:
http://www.ibm.com/pc/us/netfinity/clustering
You can obtain up-to-date information about your IBM Netfinity EXP300, a complete
listing of the options that are supported on your model, and information about other
IBM server products by accessing the IBM web page at:
http://www.ibm.com/pc/us/netfinity
See "Getting help, service, and information" on page 37 for more information.
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. See "Chapter 3. Installing and replacing
devices," on page 25 for more information.
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.
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controllers to an EXP300 expansion