Howdy,
How do I tell remotely how heavy is the disk activity on a Linux box?
CPU usage doesn't say anything, since low CPU usage could mean either
light load or that everybody is blocked waiting for disk I/O. Checking
whether processes are blocked won't distinguish between those that await
disk I/O and those that await socket input, for instance.
My primary goal is to determine whether disk usage is a performance
bottleneck in a web server (Apache+PHP+MySQL). In case the solution is
driver-specific (low-level counters?), I'm using RAID1 on SCSI, kernel
2.2.
Regards,
Eran Tromer
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