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ep:labs:03 [2020/08/24 22:22]
gheorghe.petre2608 [Monitoring I/O]
ep:labs:03 [2020/08/24 22:24] (current)
gheorghe.petre2608 [Good to know:]
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 <note tip>Both the swap device (///​dev/​sda1//​) and the file system device (///​dev/​sda3//​) are contending for I/O. Both have __high amounts of write requests per second__ (//w/s//) and __high wait time__ (//await//) to __low service time ratios__ (//​svctm//​). This indicates that there is **contention** between the two partitions, causing both to **underperform**.</​note>​ <note tip>Both the swap device (///​dev/​sda1//​) and the file system device (///​dev/​sda3//​) are contending for I/O. Both have __high amounts of write requests per second__ (//w/s//) and __high wait time__ (//await//) to __low service time ratios__ (//​svctm//​). This indicates that there is **contention** between the two partitions, causing both to **underperform**.</​note>​
  
-==== Good to know: ====+==== Takeaways ​====
  
-<note important>​Takeaways for I/O monitoring:+<note important>​
   * Any time the **CPU is waiting** on I/O, the **disks are overloaded**.   * Any time the **CPU is waiting** on I/O, the **disks are overloaded**.
   * Calculate the amount of **IOPS** your disks can sustain.   * Calculate the amount of **IOPS** your disks can sustain.
ep/labs/03.txt ยท Last modified: 2020/08/24 22:24 by gheorghe.petre2608
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