软Raid5负载居高不下正常么?

blkf

我用Debian etch AMD64
技嘉GA-M55plus-S3G,北桥6100,南桥NF430
4块sata硬盘组软raid 5
ext3文件系统

空载的时候load为1
看起来md0_raid5这个进程一直保持活跃

这正常么?

top - 23:27:56 up 27 min, 1 user, load average: 1.06, 0.99, 0.80
Tasks: 51 total, 2 running, 49 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1012976k total, 89016k used, 923960k free, 13604k buffers
Swap: 2963952k total, 0k used, 2963952k free, 18584k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2105 root 10 -5 0 0 0 S 0.3 0.0 0:06.10 md0_raid5
1 root 16 0 6104 692 572 S 0.0 0.1 0:00.71 init