RAID 1 high I/O waits on CPU.

Hi all!

I have a problem with hardware RAID 1 with PERC H200 controller. There are two SAS HDD size of 1 TB. After OS installation (SLES 11) begins long delays (I/O waits) on the CPU. The system is not already loaded, and I/O waits at the CPU reach 90%. Already reinitialize the RAID array. It is to no avail. I hope for you help.

There is top screens:

 

 

Tasks: 208 total,   1 running, 207 sleeping,   0 stopped,   0 zombie

Cpu0  :  8.7%us,  2.2%sy,  0.0%ni,  0.0%id, 87.9%wa,  0.0%hi,  1.2%si,  0.0%st

Cpu1  :  5.5%us,  1.9%sy,  0.6%ni, 10.1%id, 80.5%wa,  0.0%hi,  1.3%si,  0.0%st

Cpu2  :  3.6%us,  1.0%sy,  0.0%ni, 95.0%id,  0.0%wa,  0.0%hi,  0.3%si,  0.0%st

Cpu3  : 21.9%us,  6.2%sy,  0.3%ni, 58.2%id, 10.1%wa,  2.3%hi,  1.0%si,  0.0%st

Mem:   8039724k total,  5155380k used,  2884344k free,    81024k buffers

Swap:  2104472k total,        0k used,  2104472k free,  4859664k cached

 

 

Sorry for my English. Thanks...