Owner's Manual

66 Configuring Database Storage on the Host
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 is 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 128 blocks.
NOTE: In this example, the disk /dev/emcpowera already contains a primary
partition /dev/emcpowera1. In the case of the PowerVault MD3000, MD3000i,
or EqualLogic storage array, the partitions are created on /dev/sdb1.
fdisk /dev/emcpowera
NOTE: Create a partition on /dev/emcpowera before performing the following
steps.
x # expert mode
b # adjust starting block number
1 # choose partition 1
128 # set it to 128, (This is the default stripe element size on
the Dell/EMC CX series Fibre Channel storage)
w # write the new partition
For LUNs that have a snapshot, clone, or MirrorView image, it is
recommended that you use the fdisk method than the LUN alignment offset
method. It is also recommended that you make a SAN copy of the sources
and targets.