Getting Started Guide

22 Preparing Shared Storage

#> service multipathd restart Or

#> kpartx –a /dev/mapper/<multipath_disk>

Verify that the partition has been aligned by running the one of the

following command:

•

#> fdisk –ul /dev/<block_device>

•

#> fdisk –ul /dev/mapper/<multipath_device>

Where, <

block_device

> or <

multipath_device

> is the name of the disk

whose partition was aligned.

The following example is of a sample output of the above command on a

block device that has been aligned. If your partition is properly aligned

then you will see the desired starting sector that you set in step 1 under the

Start column against your partition.

Disk /dev/mapper/mpath70: 53.6 GB, 53697576960

bytes

255 heads, 63 sectors/track, 6528 cylinders, total

104878080 sectors

Units = sectors of 1 * 512 = 512 bytes

Reboot the system if your newly created and aligned partition is not

displayed properly.

Adjusting the Stripe Element Size on a Primary

Partition

To use the fdisk utility to adjust a disk partition, perform the following steps:

NOTE: This article assumes that the disk to be aligned already contains a single

primary partition. If you want to the create primary partition, follow the steps in

"Partitioning the Shared Disk" on page 19.

DeviceBoot Start End Blocks Id System

/dev/mapper/mpat

h70p1

1024 104872319 52436096 83 Linux

Book.book Page 22 Tuesday, July 26, 2011 11:33 PM