564 IBM Flex System V7000 Storage Node Introduction and Implementation Guide
You can dynamically change the SDD path-selection policy algorithm by using the datapath
set device policy SDD command.
You can see the SDD path-selection policy algorithm that is active on the device when you
use the datapath query device command. Example 12-22 on page 563 shows that the active
policy is optimized, which means that the SDD path-selection policy algorithm that is active is
Optimized Sequential.
Example 12-23 shows the volume information from the IBM Flex System V7000 Storage
Node CLI.
Example 12-23 lshost x240_slot11
IBM_4939:FlexSystem-V7000:superuser>lshost x240_slot11
id 0
name x240_slot11
port_count 2
type generic
mask 11111
iogrp_count 4
status online
WWPN 21000024FF2F2549
node_logged_in_count 2
state inactive
WWPN 21000024FF2F2548
node_logged_in_count 2
state active
IBM_4939:FlexSystem-V7000:superuser>lshostvdiskmap x240_slot11
id name SCSI_id vdisk_id vdisk_name vdisk_UID
IO_group_id IO_group_name
0 x240_slot11 0 13 Linux_SUSE_x240 60050760008200052000000000000014 0
io_grp0
IBM_4939:FlexSystem-V7000:superuser>
12.6.3 Creating and preparing the SDD volumes for use
Follow these steps to create and prepare the volumes:
1. Create a partition on the vpath device, as shown in Example 12-24.
Example 12-24 fdisk example
[root@Palau ~]# fdisk /dev/vpatha
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF
disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
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