On Thu, Apr 26, 2012 at 10:18 PM, Lists lists@benjamindsmith.com wrote:
On 04/20/2012 05:24 AM, Giovanni Tirloni wrote:
On Apr 20, 2012 2:42 AM, "Lists"lists@benjamindsmith.com wrote:
Problem as follows:
Plug in an external USB drive.
Mount it anywhere. Doesn't matter how.
Copy a few GB of data to the drive from a non-USB disk.
Watch the load average "climb" to 5.x, sometimes 10.x or more. Why?
This on an otherwise unloaded system. Doesn't matter how many cores, how much RAM, 32/64 bit, etc.
Why should copying some files to a USB drive cause load averages to climb so high? (and network monitors to freak out?)
It's just a number. Is the system any slower?
Linux adds I/O wait time to the load average calculation.
Problem isn't so much actual "speed" but causing network monitors to freak out due to "high" load average when performing backups. I can make exceptions for servers doing backups, but then I don't get notifications when the load is legitimately high. I can make exceptions only during backup times, but that increases complexity.
Seems silly that load average would climb to 2.x or more copying some files on an otherwise lightly loaded server.
You might be better off monitoring CPU usage instead of load average in Linux.