HP LH4r HP Netserver LP 1000r User Guide - Page 24

Boot Priority, Hardware Mirroring

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Chapter 3 Installing Mass Storage Devices Boot Priority The Netserver's boot order should be considered when selecting a boot device. This is especially important if you are installing a board that requires an early number in the boot order. The board's boot priority is set by its location in the boot order. By default the Netserver searches for boot devices in this order: 1. IDE CD-ROM drive 2. Flexible disk drive 3. Embedded SCSI A channel (Hot Swap SCSI Drives) 4. Embedded SCSI B channel (external SCSI Devices) 5. PCI slot 1 6. Network connection The embedded SCSI controller consists of two channels, A and B. Channel A is used to control the Hot Swap SCSI hard drives (3). Channel B is used to control the external SCSI devices. On each SCSI channel, the controller scans for a boot device starting at device ID 0 and works through the ID numbers. The Netserver's embedded controller is always SCSI ID 7. For information about booting from a hard disk connected to an accessory board, see "Installing a Disk Array Controller Board" in Chapter 5, "Installing Additional Boards." NOTE The boot order can be changed using the Netserver's (BIOS) Setup Utility and the SCSI Select Utility. Refer to Chapter 10, "Configuring the HP Netserver," for more information. Hardware Mirroring You may choose to mirror hard drives (RAID 1) in the HP Netserver's hot swap bays. However, doing this through the software slows down disk access time, but using hardware mirroring can help speed up disk access time. Hardware mirroring requires installation of a HP NetRAID Controller in the only PCI adapter slot. An additional SCSI cable must be used to connect the NetRAID board to the SCSI backplane connector. If you do not use a supported HP NetRAID Controller board, ensure you use a DAC with an LVD interface. 18

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Chapter 3
Installing Mass Storage Devices
18
Boot Priority
The Netserver’s boot order should be considered when selecting a boot device.
This is especially important if you are installing a board that requires an early
number in the boot order. The board’s boot priority is set by its location in the boot
order.
By default the Netserver searches for boot devices in this order:
1.
IDE CD-ROM drive
2.
Flexible disk drive
3.
Embedded SCSI A channel (Hot Swap SCSI Drives)
4.
Embedded SCSI B channel (external SCSI Devices)
5.
PCI slot 1
6.
Network connection
The embedded SCSI controller consists of two channels, A and B. Channel A is
used to control the Hot Swap SCSI hard drives (3). Channel B is used to control
the external SCSI devices. On each SCSI channel, the controller scans for a boot
device starting at device ID 0 and works through the ID numbers. The Netserver’s
embedded controller is always SCSI ID 7.
For information about booting from a hard disk connected to an accessory board,
see "Installing a Disk Array Controller Board" in Chapter 5, "Installing Additional
Boards."
NOTE
The boot order can be changed using the Netserver’s (BIOS)
Setup Utility and the SCSI Select Utility.
Refer to Chapter 10,
"Configuring the HP Netserver," for more information.
Hardware Mirroring
You may choose to mirror hard drives (RAID 1) in the HP Netserver’s hot swap
bays. However, doing this through the software slows down disk access time, but
using hardware mirroring can help speed up disk access time.
Hardware mirroring requires installation of a HP NetRAID Controller in the only
PCI adapter slot.
An additional SCSI cable must be used to connect the NetRAID
board to the SCSI backplane connector.
If you do not use a supported HP
NetRAID Controller board, ensure you use a DAC with an LVD interface.