Owner's Manual

16 Deployment Guide
Securing Your System
To prevent unauthorized users from accessing your system, Dell recommends that you disable rsh after
you install the Oracle software.
Ty p e chkconfig rsh off to disable rsh.
Verifying the Storage Configuration
While configuring the clusters, create partitions on your Fibre Channel storage. In order to create the
partitions, all cluster nodes must be able to detect the external storage devices. To verify that each node
can detect each storage LUN or logical disk, perform the following steps:
1
For Dell | EMC Fibre Channel storage, verify that the EMC Navisphere
®
agent and the correct
version of PowerPath (see Table 1-6) are installed on each node, and that each node is assigned to the
correct storage group in your EMC Navisphere software. See the documentation that came with your
Dell | EMC Fibre Channel storage for instructions.
NOTE: The Dell Professional Services representative who installed your cluster performed this step. If you
reinstall the software on a node, you must complete this step.
2 Visually verify that the storage devices and cluster nodes are connected correctly to the Fibre Channel
switch (see Figure 1-1 and Table 1-4).
3 Verify that you are logged in as root .
4 On each node , type:
more /proc/partitions
The node detects and displays the LUNs or logical disks, as well as the partitions created on those
external devices.
NOTE: The listed devices vary depending on how your storage is configured.
A list of the LUNs or logical disks that are detected by the node is displayed, as well as the partitions
that have been created on those external devices. PowerPath pseudo devices appear in the list, such as
/dev/emcpowera , /dev/emcpowerb , and /dev/emcpowerc .
5 In the /proc/partitions file, ensure that:
• All PowerPath pseudo devices appear in the file with similar device paths. For example,
/dev/emcpowera , dev/emcpowerb , and /dev/emcpowerc .
• The Fibre Channel LUNs appear as SCSI devices, and each cluster node is configured with the
same number of LUNs.
For example, if the node is configured with a SCSI drive or RAID container attached to
a Fibre Channel storage device with three logical disks,
sda identifies the node’s RAID container
or internal drive, and
emcpowera , emcpowerb , and emcpowerc identifies the LUNs (or PowerPath
pseudo devices).