Owner's Manual

16 Deployment Guide
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Verifying the Storage Configuration
During the cluster configuration described in this document, you will 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).
If the external storage devices do not appear in the
/proc/partitions file:
1 Stop the PowerPath service on all nodes by typing:
service naviagent stop
service PowerPath stop