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HP SmartArray p812 problem

Occasional Visitor

HP SmartArray p812 problem

Hello, we have such problem with our SmartArray p812 controller:

We have server running Cetos 5.5 with Postgres database running on raid10 disk (disk consists of 6 SAS HP drives), using iostat we have statistcs such as

cciss/c0d3        0.60    95.00 336.00 47.00  5449.60  1420.80    17.94    26.88   80.20   2.61 100.02
As you see we have 100% utilisation level.. And about 96 + 336 = 432 IOPS. But as we have calculated or IOPS rate must be somwhere ~170*6(disks) =~1000 IOPS. Why is utilisation so high? What we could do in order to lower utilisation and our servers load average? 

heare are smartarray configuration:

Smart Array P812 in Slot 2
   Bus Interface: PCI
   Slot: 2
   Serial Number: PAGXQ0ARHZV0CE
   Cache Serial Number: PBCDF0CRHZV2EL
   RAID 6 (ADG) Status: Enabled
   Controller Status: OK
   Chassis Slot:
   Hardware Revision: Rev C
   Firmware Version: 3.52
   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: OK
   Accelerator Ratio: 50% Read / 50% Write
   Drive Write Cache: Enabled
   Total Cache Size: 1024 MB
   No-Battery Write Cache: Disabled
   Cache Backup Power Source: Capacitors
   Battery/Capacitor Count: 1
   Battery/Capacitor Status: OK
   SATA NCQ Supported: True

And raid disk configuration:

Logical Drive: 4
         Size: 838.3 GB
         Fault Tolerance: RAID 1+0
         Heads: 255
         Sectors Per Track: 32
         Cylinders: 65535
         Stripe Size: 128 KB
         Status: OK
         MultiDomain Status: OK
         Array Accelerator: Enabled
         Unique Identifier: 600508B100105039535854324E360400
         Disk Name: /dev/cciss/c0d3
         Mount Points: /vz/pgsql 838.3 GB
         OS Status: LOCKED
         Logical Drive Label: AEBD9047PACCP9SXT2N6A92B
         Mirror Group 0:
            physicaldrive 5I:1:4 (port 5I:box 1:bay 4, SAS, 450 GB, OK)
            physicaldrive 5I:1:5 (port 5I:box 1:bay 5, SAS, 450 GB, OK)
            physicaldrive 5I:1:7 (port 5I:box 1:bay 7, SAS, 450 GB, OK)
         Mirror Group 1:
            physicaldrive 5I:1:8 (port 5I:box 1:bay 8, SAS, 450 GB, OK)
            physicaldrive 5I:1:10 (port 5I:box 1:bay 10, SAS, 450 GB, OK)
            physicaldrive 5I:1:11 (port 5I:box 1:bay 11, SAS, 450 GB, OK)


SAS Disk are such:

physicaldrive 5I:1:8
         Port: 5I
         Box: 1
         Bay: 8
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 450 GB
         Rotational Speed: 15000
         Firmware Revision: HPD6
         Serial Number: 3QQ08EEH000099075RKT
         Model: HP      DF0450B8054    
         PHY Count: 2
         PHY Transfer Rate: 3.0GBPS, Unknown