Getting Started Guide

Preparing Shared Storage 23

CAUTION: In a system running the Linux operating system, align the partition

table before the data is written to the Volume. Failure to follow the precaution

could lead to all the data on the Volume to be destroyed.

At the command prompt, type:

1 #> fdisk -u /dev/<block_device>

where <

block_device>

is the name of the block device that you are

adjusting. For example, if the block device is

/dev/mapper/db

, type:

fdisk /dev/mapper/db.

The system displays the following message:

The number of cylinders for this disk is set to

8782. There is nothing wrong with that, but this

is larger than 1024, and could in certain setups

cause problems with:

1)software that runs at boot time (e.g., old

versions of LILO)

2)booting and partitioning software from other OSs

(e.g., DOS FDISK, OS/2 FDISK)

a. Command (m for help): x # To enter the expert

Mode

b. Expert command (m for help): b # To move

beginning of data in a partition

c. Partition number (1-4): 1 # The partition

number to be aligned

d. New beginning of data (128-xxxxx, default

128): 128

NOTE: 1 block = 512 bytes; 128 blocks * 512 bytes = 64KB

e. Expert command (m for help): w # write

NOTE: 128 blocks/64 KB is the default Stripe Element Size of EqualLogic PS

Series and 256 blocks/256 KB is the default Stripe Element Size of the

PowerVault MD 32xx/32xxi Line of storage arrays.

Repeat step 1 for all the disks that need to be aligned.

Book.book Page 23 Tuesday, July 26, 2011 11:33 PM