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