Configuring an Array
7-32
Compaq Smart Array 5300 Controller User Guide
COMPAQ CONFIDENTIAL
Writer: John Turner File Name: h-ch7 configuring an array.doc
Codename: SilverHammer Part Number: 135606-004 Last Saved On: 7/22/02 10:58 AM
Configuring the New Logical Drive
1.
In the
Logical Configuration View
panel, highlight the new logical drive that
you want to configure, and then press the
Enter
key.
2.
Select
Fault Tolerance
in the
Logical Drive Options
menu, and then press the
Enter
key.
3.
Choose the RAID level that you want and then press the
Enter
key.
4.
Choose
Stripe Size
and then press the
Enter
key.
5.
Choose the stripe size that you want and then press the
Enter
key.
6.
Press the
Esc
key to accept the settings and return to the main manual
configuration screen.
Configuring the Controller Settings
The
Controller Settings
option allows you to choose the drive rebuild priority,
expansion priority, and accelerator ratio for all arrays on the controller.
•
With a
low
priority setting, a rebuild or expansion takes place only when the
array controller is not busy handling normal I/O requests. This setting has
minimal effect on normal I/O operations. However, there is an increased risk that
data will be lost if another physical drive fails while the rebuild is in progress.
•
With a
high
priority setting, the rebuild or expansion occurs at the expense of
normal I/O operations. Although performance is affected, this setting provides
better data protection because the array is vulnerable to additional drive failures
for a shorter time.
NOTE:
Logical drives can be rebuilt only if they are configured for fault tolerance (RAID 1+0,
RAID 5, or RAID ADG). Drive rebuild begins automatically after you have replaced a failed
physical drive in the array.
The accelerator read/write ratio determines the amount of memory allocated to the
read and write caches on the array accelerator. Different applications have different
optimum settings. Some controllers (especially those without battery-backed write
cache) do not allow this ratio to be changed.