About Disk Load

Hi,
I am confused about disk load. When I use Solaris management console to see disk use I see that there is average 600Kb/sec on disk. But disk busy time is almost %100.
I know that the io capacity of a disk must be much larger 600kb/sec. So I dont understand why disk usage is 100% when io is only 600Kb.
My cpu shows about 50 % wait time and I gues wait time is due to disks.
We have 4 disks with RAID 5.
2 Sparc with 8GB ram. 20 GB swap. 64 bit environment
Any help will be useful
Thanks in advance
Sezai

the%busy time is not what you expect! It is the percentage of the sample time for which there was at least one command active in the HBA.
If you use iostat -xnz 1 to use 1 second sample interval and you see a drive with 100 % busy then that just means that there was at least 1 active command out in the HBA/disk for 100% of that second. Modern disk drives can execute more than 1 command at a time so you can't use the %busy column to determine how busy a disk drive is. You can look at the actv column to see how many commands are running in parallel on that drive.
Solaris implements a throttle for each drive and when you exceed that you will see commands appear in the wait column and that is bad..
The % busy column is used to identify when you have bursty workloads that drop large numbers of commands on the disk drive at the same time and then queueing theory kicks in.
Make sure you don't have anything in the wait column of iostat -xnz 1 and watch the asvc_t doesn't get too big.
tim

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>
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