The voting disk is used by Oracle??™s clustering software,
Cluster Ready Services (CRS), to arbitrate ownership of the cluster in case of a private network
failure. The OCR disk is used to maintain all metadata about the cluster: the cluster configuration
and the cluster database configuration.
Kernel Parameters
Most of the ???out of the box??? kernel parameters are set correctly for Oracle except a few; ensure
that the kernel parameters in Table 10-2 are set to the values provided in the table.
NOTE
For 64-bit platforms, if your SGA will be larger than 2GB, the value
for kernel.shmall should be at least as large as the value of the
initialization parameter SGA_MAX_SIZE.
Chapter 10: Real Application Clusters 355
You can confirm that these values are in effect using the following command:
[root@oc1 ~]# /sbin/sysctl -a |
egrep 'sem|shm|file-max|ip_local|rmem|wmem'
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 4194304
net.core.wmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_max = 262144
vm.hugetlb_shm_group = 0
kernel.sem = 250 32000 100 128
kernel.shmmni = 4096
kernel.shmall = 2097152
kernel.shmmax = 2147483648
fs.file-max = 65536
[root@oc1 ~]#
In a default Oracle Enterprise Linux installation, some of these parameters are already set. For
those values that vary from Table 10-2, simply append the parameter name and the value from
the previous sample output to the file /etc/sysctl.
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