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тАО11-16-2006 02:06 AM
тАО11-16-2006 02:06 AM
What tools can help identify RAID as source of bottleneck?
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тАО11-16-2006 02:48 AM
тАО11-16-2006 02:48 AM
Re: What tools can help identify RAID as source of bottleneck?
Then, you could do performance test to identify the maximum transfer rate to the disk subsistem, for example using dd. Then, identify if your application can reach that transfer rate.
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тАО11-16-2006 03:02 AM
тАО11-16-2006 03:02 AM
Re: What tools can help identify RAID as source of bottleneck?
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тАО11-16-2006 05:02 AM
тАО11-16-2006 05:02 AM
Re: What tools can help identify RAID as source of bottleneck?
vmstat [interval] [number_of_samples]
For example, using:
vmstat 300 10
Will display 10 samples every 5 minutes (300 seconds).
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тАО11-16-2006 05:08 AM
тАО11-16-2006 05:08 AM
Re: What tools can help identify RAID as source of bottleneck?
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тАО11-16-2006 06:50 AM
тАО11-16-2006 06:50 AM
Re: What tools can help identify RAID as source of bottleneck?
But this is system dependent. As a general rule, a value close to 10 can indicate an I/O problem. As a rule of thumb, consider 25% as high iowait if you have idle cpu.
Iowait can be caused also by paging/swapping acitivities, this occurs if your system memory is not enough, check the swap in swap out columns in the output of vmstat (si/so).
You can also use the "sar -d" and iostat commands to identify the transfers/request per second.
You should also see:
http://www.sarcheck.com/
http://www.linuxquestions.org/linux/answers/Jeremys_Magazine_Articles/Hunting_I_O_Bottlenecks_with_iostat