Deployment Guide

18 Deployment Guide
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 small computer system interface (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
On all the nodes , stop the PowerPath service by typing:
service naviagent stop
service PowerPath stop
2
On all the nodes , reload the HBA driver to synchronize the kernel's partition tables by typing:
• For QLogic HBAs:
rmmod qla2300
modprobe qla2300
• For Emulex HBAs:
rmmod lpfc
modprobe lpfc
3 On all the nodes , restart the PowerPath service by typing:
service PowerPath start
service naviagent start
4
Confirm that all the nodes detect the external storage devices by typing:
more /proc/partitions