hpacucli configure P410

We are expiriencing problems in configuring of cacheratio param on HP
Smart Array P410. Battery installed. Lates firmware installed.
We are using hpacucli (hpacucli_8.35-7.0.3-5_amd64.deb) on Ubuntu 9.10


=> ctrl all show detail

Smart Array P410 in Slot 4
Bus Interface: PCI
Slot: 4
Serial Number: PACCR9SYN3PL
Cache Serial Number: PACCQ9SY952F
RAID 6 (ADG) Status: Disabled
Controller Status: OK
Chassis Slot:
Hardware Revision: Rev C
Firmware Version: 3.30
Rebuild Priority: Medium
Expand Priority: Medium
Surface Scan Delay: 15 secs
Queue Depth: Automatic
Monitor and Performance Delay: 60 min
Elevator Sort: Enabled
Degraded Performance Optimization: Disabled
Inconsistency Repair Policy: Disabled
Wait for Cache Room: Disabled
Surface Analysis Inconsistency Notification: Disabled
Post Prompt Timeout: 0 secs
Cache Board Present: True
Cache Status: Not Configured
Accelerator Ratio: 100% Read / 0% Write
Drive Write Cache: Disabled
Read Cache Size: 0 MB
Write Cache Size: 0 MB
Total Cache Size: 144 MB
No-Battery Write Cache: Disabled
Cache Backup Power Source: Batteries
Battery/Capacitor Count: 1
Battery/Capacitor Status: OK
SATA NCQ Supported: True

=> controller slot=4 modify cacheratio=25/75

=> controller slot=4 modify cacheratio=?

Available options are:
0% read / 100% write
25% read / 75% write (default value)
50% read / 50% write
75% read / 25% write
100% read / 0% write (current value)


No changes as you can see. Also nothing changes after reboot.
Can you provide us a solution on this issue?