Owner's Manual

64 Configuring Database Storage on the Host
To verify that each node can detect each storage LUN or logical disk:
1
For the Dell/EMC Fibre Channel storage system, verify that the EMC
®
Navisphere
®
agent and the correct version of PowerPath
®
are installed on
each node. Verify that each node is assigned to the correct storage group in
the EMC Navisphere software. For instructions, see the documentation
that came with your Dell/EMC Fibre Channel storage system.
NOTE: If you are installing the cluster or reinstalling the software on a node,
you must perform step 1.
2 Visually verify that the storage devices and the nodes are connected
correctly to the Fibre Channel switch (see Figure 3-1 and Table 3-1).
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 these 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 .
In the case of a direct-attached SAS or iSCSI configurations,
the virtual disks appears as
/dev/sdb and /dev/sdc .
Table 7-1. Fibre Channel, Direct-Attached SAS, and EqualLogic Array Nomenclature
Fibre Channel
Storage
Direct-Attached SAS or iSCSI
(MD3000/MD3000i)
EqualLogic Array Volumes
LUNs Virtual disks Volumes
/dev/emcpower(X) /dev/sd(X) /dev/sd(X)
PowerPath Multi-Path (MPIO) Device Mapper