This topic describes the z/VM® total CPU loads with all running Linux® guests.
Figure 1 shows the z/VM total CPU loads (hypervisor view) with all Linux guests running.
The z/VM total CPU load is an indicator for the utilization of the SUT, where the top CPU consumers are the single ECM node and the ECM database node.
Both z/VM total CPU loads for XFS and Spectrum Scale are shown side-by-side, together with the ICN page throughput for the different SUT load levels.
Figure 1. Spectrum Scale and XFS - z/VM total CPU loads and ICN
page throughput
Observations
For the low load level, the z/VM total CPU was at 600% (6 IFL processors), and for the high load level around 2300% (23 IFL processors). The z/VM total CPU load was similar for both setups.
For Spectrum Scale, the CPU load was up to 750 users which was slightly lower than for XFS.
Only at the high load level was it slightly higher.
Conclusion
The CPU costs for Spectrum Scale (single node cluster) and XFS as FileNet® File Storage Area filesystem are comparable. The expected additional overhead for a parallel filesystem did not
occur in terms of significant additional CPU cost for the ECM node.
