Issues caused by the low-level system components
This section discusses the issues caused by the low-level system components used in the IBM Spectrum Scale cluster.
- Suboptimal performance due to high utilization of the system level components
In some cases, the CPU or memory utilization on an IBM Spectrum Scale node is higher than 90%. Such heavy utilization can adversely impact the system performance as it affects the cycles allocated to the IBM Spectrum Scale daemon service. - Suboptimal performance due to long IBM Spectrum Scale waiters
Low-level system issues, like slow disks, or slow network, might cause long GPFS waiters. These long waiters cause performance degradation. You can use the mmdiag --waiters command to display the mmfsd threads waiting for events. This information can help resolve deadlocks and improve the system performance. - Suboptimal performance due to networking issues caused by faulty system components
The system might face networking issues, like significant network packet drops or packet errors, due to faulty system components like NIC, drivers, cables and network switch ports. This can impact the stability and the quality of the GPFS communication between the nodes, degrading the system performance.
Parent topic: Performance issues