NEC Express5800 140Rd-4 User Manual page 116

4-34
– "Advanced Menu"
(a) "Stripe Size": Sets stripe size.
Parameter
248
16
32
64
128
(b) "Write Policy": Sets write policy.
Parameter
WRTHRU
WRBACK
(c) "Read Policy": Sets read policy.
Parameter
NORMAL
READAHEAD
ADAPTIVE
(d) "Cache Policy": Sets cache policy.
Parameter
Cached IO
Direct IO
(e) "Span": Sets Span.
Parameter
CANSPAN
NOSPAN
When SPAN setting is available for the hard disk configuration of the pack, "YES" is displayed by default.
When performing SPAN, create 2 or more sets of the same pack at pack creation. (For SPANNING OF
RAID1 creation; refer to "Setting SPAN" described later for detailed procedures.)
9.
When all settings are completed, select "Accept" and then press Enter to create logical drive. The created logical
drive is displayed in the "Logical Drive Configured" screen.
10.
After creating logical drive, press Esc to close the screen. Go back to the "Save Configuration?" screen and then
select "Yes" to save the configuration.
11.
When the confirmation message shows that the configuration was saved, press Esc to return to the TOP menu
screen.
In the TOP menu screen, select "Objects" → "Logical Drive" → "View/Add Parameters" to check logical drive
12.
information. Setting values for "Write Policy," "Read Policy" and "Cache Policy" can be changed.
Remarks
–
–
–
Default display: recommended set value
Remarks
Write through
Write back (Default display)
Remarks
Does not perform read ahead.
Default display: recommended set value
Read ahead
Performs read ahead when sequential sectors are accessed twice
consecutively.
Remarks
Caches the data read from a hard disk and then transfers it to the
server.
Default display: recommended set value
Remarks
SPAN=YES
SPAN=NO
SPANNING