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How does sar collect/calculate disk utilization %?
Unicorn Meta Zoo #1: Why another podcast?
Announcing the arrival of Valued Associate #679: Cesar Manara
Come Celebrate our 10 Year Anniversary!Trouble interpreting iostat's tps measureWhat's going on with my server? High load, lots of idle CPU time, low disk utilizationWhat does the fields in sar -B output mean?Debian Installer Preseed with Somewhat Dynamically Allocated Software RAIDsar command to generate only CPU utilization and network statistics in LinuxSar: what does totsck stand forRelation between disk IOPS and sar tpsHow do storage IOPS change in response to disk capacity?How are CPU time and CPU usage the same?interpreting disk stats using sar
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I'm pretty sure sar's disk utilization % shows how much of the disk is being utilized at any given time, but how does it calculate that? I found:
%util
Percentage of CPU time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100%.
In the sar man page, but that doesn't answer much for me - the CPU could be issuing I/O requests infinitely but that doesn't necessarily mean that the disk is at capacity - would it not be more appropriate to measure when requests start becoming latent as a ceiling for how hard a disk is being hit?
linux performance sar
asked Apr 17 at 21:56
LocaneLocane
229417
add a comment |
I'm pretty sure sar's disk utilization % shows how much of the disk is being utilized at any given time, but how does it calculate that? I found:
%util
Percentage of CPU time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100%.
In the sar man page, but that doesn't answer much for me - the CPU could be issuing I/O requests infinitely but that doesn't necessarily mean that the disk is at capacity - would it not be more appropriate to measure when requests start becoming latent as a ceiling for how hard a disk is being hit?
linux performance sar
asked Apr 17 at 21:56
LocaneLocane
229417
add a comment |
I'm pretty sure sar's disk utilization % shows how much of the disk is being utilized at any given time, but how does it calculate that? I found:
%util
Percentage of CPU time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100%.
In the sar man page, but that doesn't answer much for me - the CPU could be issuing I/O requests infinitely but that doesn't necessarily mean that the disk is at capacity - would it not be more appropriate to measure when requests start becoming latent as a ceiling for how hard a disk is being hit?
linux performance sar
asked Apr 17 at 21:56
LocaneLocane
229417
I'm pretty sure sar's disk utilization % shows how much of the disk is being utilized at any given time, but how does it calculate that? I found:
%util
Percentage of CPU time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100%.
In the sar man page, but that doesn't answer much for me - the CPU could be issuing I/O requests infinitely but that doesn't necessarily mean that the disk is at capacity - would it not be more appropriate to measure when requests start becoming latent as a ceiling for how hard a disk is being hit?
linux performance sar
linux performance sar
asked Apr 17 at 21:56
LocaneLocane
229417
asked Apr 17 at 21:56
LocaneLocane
229417
asked Apr 17 at 21:56
LocaneLocane
229417
asked Apr 17 at 21:56
LocaneLocane
229417
asked Apr 17 at 21:56
LocaneLocane
229417
229417
add a comment |
add a comment |
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