IBM 866011U - Netfinity 5500 - 8660, Hardware Maintenance Manual

Page: 129 / 402

To change the write policy:
1. Start the ServeRAID Configuration program (see
“Starting the ServeRAID Configuration program” on
page 77).
2. Select Advanced Functions from the Main Menu;
then, press Enter.
3. Select Logical Drive Parms Management from the
Advanced Functions menu; then, press Enter.
4. Select Change Write Policy from the next menu;
then, press Enter.
A screen similar to the following appears.
IBM ServeRAID Adapter Disk Array Configuration Ver. X.XX
Adapter Number: 1 Bus Number: 0 Host ID = Null Config
1. Help
2. Change Write Policy
3. Set NVRAM Cache Controller
4. Exit
Logical Drive Params Management
Array
ID Size
Log
Drv
Size
(MB)
RAID
Level Status
Wrt
Pol
A0
B0
A1
B1
100
100
200
200
RAID-0
RAID-0
RAID-0
RAID-1
OKY
OKY
OKY
OKY
WT
WT
WT
WT
A
B
1920
2006
Select logical drive and press Enter to toggle the write policy. Press the ESC
key to make the change.
Bay
Array
Bay
Array
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Ch 1 Ch 2
INI
RDY
CDR
B
B
HSP
ONL
ONL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
INI
A
A
ONL
ONL
A ONL
5. Locate the Wrt Pol field in the Logical Drive list.
The write policy is shown as either write through
(WT), which is the default setting, or write back (WB).
6. Select the logical drive whose write policy you want to
change.
Attention
If you change the write policy to WB, wait at least
10 seconds after the last operation before you
turn off the system. It takes that long for the
system to move the data from the cache memory
to the storage device. Failure to follow this
practice can result in lost data.
7. Press Enter to change the write policy. (You can
press Enter to toggle between WT and WB.)
8. Press Esc. The Confirm pop-up window appears.
9. Select Yes to save the changes, or select No to
return the setting to its original state; then, press
Enter.
10. Back up the disk-array configuration information to
diskette. See “Backing up the disk-array
configuration” on page 126 for more information.
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