HP LH4r Integrated HP NetRaid Controller Configuration Guide - Page 33

Step B. Plan Arrays and Logical Drives

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Chapter 4 Planning SCSI Transfer Rate On Worksheet A, record the SCSI transfer rate for each channel. The default SCSI transfer rate is Ultra2, because the internal hot-swap mass storage cage supports Ultra2 disk drive modules. However, you can change the SCSI transfer rate to Fast or Ultra if the channel is connected to an external mass storage enclosure. Refer to your system or external mass storage system documentation to determine whether your disk enclosure supports Fast, Ultra, or Ultra2 SCSI drives. NOTE If you have connected a second hot-swap mass storage cage to SCSI B, your SCSI transfer rate for this channel should also be Ultra2. Any non-hot-swap SCSI devices have a separate SCSI connector that isolates the Ultra2 drives from the nonhot-swap, single-ended devices. Step B. Plan Arrays and Logical Drives There are two ways to set up arrays and logical drives. • Automatic configuration is explained for those users who do not want to customize their arrays and logical drives. • Custom configurations permit you to create exactly the configuration that best suits your needs. Automatic Configuration Automatic mode defines the arrays and logical drives for you, and sets their parameters. It makes configuration easy. Automatic mode uses the following rules to define arrays: • If integrated HP NetRAID is enabled for SCSI B, Automatic mode does not distinguish non-hot-swap devices from hot-swap disk drives in the mass storage cage or other enclosure. Both the hot-swap and non-hotswap devices are incorporated into the RAID subsystem. • It scans the physical drives, starting at SCSI ID 0 on Channel 0, and it groups the physical drives by capacity, with up to five drives in an array. • Each array is defined as a single logical drive, and array spanning is not used. 27

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Chapter 4
Planning
27
SCSI Transfer Rate
On Worksheet A, record the SCSI transfer rate for each channel. The default
SCSI transfer rate is Ultra2, because the internal hot-swap mass storage cage
supports Ultra2 disk drive modules. However, you can change the SCSI transfer
rate to Fast or Ultra if the channel is connected to an external mass storage
enclosure. Refer to your system or external mass storage system documentation to
determine whether your disk enclosure supports Fast, Ultra, or Ultra2 SCSI
drives.
NOTE
If you have connected a second hot-swap mass storage cage to
SCSI B, your SCSI transfer rate for this channel should also
be Ultra2. Any non-hot-swap SCSI devices have a separate
SCSI connector that isolates the Ultra2 drives from the non-
hot-swap, single-ended devices.
Step B. Plan Arrays and Logical Drives
There are two ways to set up arrays and logical drives.
•
Automatic configuration is explained for those users who do not want to
customize their arrays and logical drives.
•
Custom configurations permit you to create exactly the configuration that
best suits your needs.
Automatic Configuration
Automatic mode defines the arrays and logical drives for you, and sets their
parameters. It makes configuration easy.
Automatic mode uses the following rules to define arrays:
•
If integrated HP NetRAID is enabled for SCSI B, Automatic mode does
not distinguish non-hot-swap devices from hot-swap disk drives in the
mass storage cage or other enclosure.
Both the hot-swap and non-hot-
swap devices are incorporated into the RAID subsystem.
•
It scans the physical drives, starting at SCSI ID 0 on Channel 0, and it
groups the physical drives by capacity, with up to five drives in an array.
•
Each array is defined as a single logical drive, and array spanning is not
used.