Dear Ganglia developers
first, thanks for your work on this great project!
I currently stuck in an issue with monitoring disk access. I'm using the
diskstat python module and tried to get out how much bytes actually were
read/written from/to the disk. I noticed the calculation for
bytes_per_second in the code [1] what leads to something like
"reads_merged_delta * 512_Bytes_per_sector / 15s_delta_time"
My question: is the value in reads_merged spanning over only one sector
or could one read be from multiple sectors?
If multiple sectors were read with for 1 read_merged, should the # of
read sectors also considered in this calculation?
I'm not sure a) if I understand the /proc/diskstat info wrong or b) if
there is a bug in the diskstat module.
Can you help me to figure that out?
Thank you all!
Best
Christopher
[1]
https://github.com/ganglia/monitor-core/blob/master/gmond/python_modules/disk/diskstat.py#L304
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