Owner's Manual

Deployment Guide 19
Verifying the Storage Configuration
While configuring the clusters, create partitions on your Fibre Channel storage system. In order to create
the partitions, all the 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 system, verify that the EMC Navisphere
®
agent and the correct
version of PowerPath (see Table 1-7) 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 system 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 perform this step.
2 Visually verify that the storage devices and the 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 system is configured.
A list of the LUNs or logical disks that are detected by the node is displayed, as well as the partitions
that are 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 names across all nodes.
For example,
/dev/emcpowera , / dev/emcpowerb , and /dev/emcpowerc .
• The Fibre Channel LUNs appear as SCSI devices, and each 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, reboot the node.