Owner's Manual

52 Configuring Storage, Oracle User Equivalence, and Networking for Oracle RAC
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 .
• In the case of the PowerVault MD3000 or MD3000i or the EqualLogic
storage array, all the virtual disks or volumes appear in the file with
similar device names across all nodes.
For example:
/dev/sdb , /dev/sdc , and /dev/sdd
• The external storage logical volumes appear as SCSI devices, and each
node is configured with the same number of LUNs, virtual disks or
volumes.
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 identify the LUNs
(or PowerPath pseudo devices).
If the node is configured with a SCSI drive or RAID container attached
to a direct-attached SAS or iSCSI storage device with three virtual disks,
sda identifies the RAID container or internal drive of the node, and sdb ,
sdc , and sdd identify the external storage logical volumes.
6 If the external storage devices do not appear in the /proc/partitions file,
reboot the node.
Adjusting Disk Partitions for Systems Running the
Linux Operating System
CAUTION: In a system running the Linux operating system, align the partition
table before data is written to the LUN/virtual disk. The partition map is rewritten
and all data on the LUN/virtual disk destroyed.
Example: fdisk Utility Arguments
The following example indicates the arguments for the fdisk utility. In this
example, the LUN is mapped to
/dev/emcpowera , and the LUN stripe element
size is of 128 blocks.
NOTE: In this example, the disk /dev/emcpowera already has a primary partition
/dev/emcpowera1 created. In the case of the PowerVault MD3000, MD3000i,
or EqualLogic storage array, the process is performed on /dev/sdb1.