HP NetRAID 1 Controller - Manual (Page 55)

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7. Set the spanning mode for the current logical drive. Highlight Span and press Enter. The
options are:
•
CanSpan: Array spanning is enabled for the current logical drive. The logical drive can
occupy space in more than one array
•
NoSpan: Array spanning is disabled for the current logical drive. The logical 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. For example,
assuming Array 2 contains four disk drives, it can be spanned only with Array 1 and/or Array
3, and only if Arrays 1 and/or 3 also contain four disk drives. If the two criteria for spanning
are met, the adapter automatically allows spanning. If the criteria are not met, the Span
setting makes no difference for the current logical drive. In an inconsistent stripe, firmware
always updates the parity stripe to restore consistency. Highlight a spanning option and press
Enter.
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, thus 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 specifies the size of the segments written to each disk in a RAID
0, 3, or 5 logical drive.
•
Write Policy: This option sets the caching method to Write-Back or Write-Through.
•
Read-Ahead: This option enables the SCSI Read-Ahead feature for the logical drive. You
can set this parameter to Normal, Read-Ahead, or Adaptive.
•
Cache Policy: This parameter sets read cache operation during data transfers involving the
selected logical drive.
Press Esc to exit the Advanced Menu.
10. When you are finished defining the current logical drive, highlight Accept and press Enter. If
there is space remaining in the arrays, the next logical drive to be configured appears. To
configure another logical drive, repeat steps 6 to 9. If the array space has been used up, a list
of the existing logical drives appears. Press any key to continue and respond to the Save
prompt.
11. Initialize the logical drives you have just configured. See Initializing Logical Drives later in
this section.
Creating Arrays Using View/Add Configuration
View/Add Configuration allows you to associate logical drives with partial and/or multiple physical
arrays (this is called spanning of arrays).
The existing configuration is left intact, so you can also use View/Add Configuration simply to look
at the current configuration.
1. Choose Configure from the HP NetRAID Express Tools Management Menu.
2. Choose View/Add Configuration from the Configure menu. An array selection window is
displayed showing the devices connected to the current adapter. Hot key information appears
at the bottom of the screen. The hot key functions are: