Getting Started Guide

24 Preparing Shared Storage
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.
2 Repeat step 1 for all the disks that need to be aligned.
3 Run the following command to re-scan all the partitions on node one when
using device mapper:
#> kpartx -a /dev/mapper/<devicename>
On all other nodes run:
#> kpartx -l /dev/mapper/devicename>
NOTE: If your device name does not end in "p1", reboot your system. Proper
name convention would append a "p1" and display as
/dev/mapper/ACFSp1.
4
Verify that the partition has been aligned by running the following
command:
#> fdisk -ul /dev/<block_device>
Where, <block_device> is the name of the block device.
The following example of a sample output of the command executed on a
block device that has been aligned. If your partition is properly aligned
then
128 is displayed 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
5
Reboot the system if your newly created and aligned partition is not
displayed.
DeviceBoot Start End Blocks Id System
/dev/mapper/mpat
h70p1
128 104872319 52436096 83 Linux