Testing for Scalability - Expert Oracle RAC Performance Diagnostics and Tuning - page 99

Table 4-4. RAP Phase II—Scalability Load on Two Servers

Test # Scalability Factor No. of Users No. of Nodes Iterations Duration

6 10 60 8 5 1 hour

During the process of testing, the following network parameters were increased from their default values
recommended by Oracle in the RAC installation and configuration guides:

fs.file-max = 6815744
fs.aio-max-nr = 3145728
vm.nr_hugepages=18433
net.core.wmem_max=12582912
net.core.rmem_max=12582912
net.ipv4.tcp_rmem= 10240 4194304 12582912
net.ipv4.tcp_wmem= 10240 4194304 12582912
net.core.netdev_max_backlog = 5000
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.ip_local_port_range = 1024 65500

As illustrated in Figure 4-7 , the overall throughput and workload on all eight nodes in the cluster are normal.
The cluster components are scalable and the load average is recorded as the baseline for future comparisons.

Figure 4-7. OEM 11g: 8 Eight-node cluster scalability study