HP NetRAID 1 Controller - Manual (Page 42)

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3. Press the arrow keys to highlight the physical drives. Press the spacebar to select physical
drives to be associated with the current array. The indicator for the selected drive changes
from READY to ONLIN A [array number]-[drive number]. For example, ONLIN A2-3
means disk drive 3 in array 2. Add physical drives to the current array as desired. Try to use
drives of the same capacity in a specific array. If you use drives with different capacities in an
array, all drives in the array are treated as if they have the capacity of the smallest drive in the
array. The number of physical drives in a specific array determine the RAID levels that can
be implemented with the array.
4. Press Enter to end the selection process. To continue defining arrays, repeat step 3. To begin
logical drive configuration, go to step 5.
5. Press F10 to configure logical drives. The logical drive configuration screen appears. The
window at the top of the screen shows the logical drive that is currently being configured as
well as any existing logical drives. The column headings are:
LD The logical drive number
RAID The RAID level
Size The logical drive size
#Stripes The number of stripes (physical drives) in the associated
physical array
StrpSz The stripe size
Drive-State The state of the logical drive
6. Set the RAID level for the logical drive. Highlight RAID and press Enter. The available
RAID levels for the current logical drive are displayed. Select a RAID level and press Enter
to confirm.
7. Set the spanning mode for the current logical drive. Highlight Span and press Enter. The
choices are:
•
CanSpan: Array spanning is enabled for the current logical drive. The drive can occupy
space in more than one array.
•
NoSpan: Array spanning is disabled for the current logical drive. The drive can occupy space
in only one array.
To be able to span two arrays, they must have the same stripe width (they must contain the
same number of physical drives) and must be consecutively numbered.
The default setting is NoSpan.
8. Set the logical drive size. Move the cursor to Size and press Enter. By default, the logical
drive size is set to all available space in the array(s) being associated with the current logical
drive, accounting for the Span setting and for partially used array space. For example: if the
previous logical drive used only a part of the space in an array, the current logical drive size
is set to the remaining space by default.
9. Open the Advanced menu to set the remaining options.
•
Stripe size: This parameter sets the size of the segment written to each disk in a RAID 0, 1,
3, or 5 logical drive. The default setting is 8 K.
•
Write Policy: This parameter sets the cache write policy. You can set the write policy to
Write-Back or Write-Through. The default setting is WRTHRU.
•
Read-Ahead: This parameter enables the SCSI Read-Ahead feature for the logical drive. Set
this parameter to Normal, Read-Ahead, or Adaptive. The default setting is Adaptive.
•
Cache Policy: This parameter sets read cache operation during data transfers involving the
current logical drive. The default setting is CachedI/O.