Installation guide

Chapter 28. Miscellaneous storage topics
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multipath {
wwid 1IET_00010004
alias oramp1
}
multipath {
wwid 1IET_00010005
alias oramp2
}
multipath {
wwid 1IET_00010006
alias oramp3
}
multipath {
wwid 1IET_00010007
alias oramp4
}
}
Multipath devices are created in the /dev/mapper directory. The above example will create 4
LUNs named /dev/mapper/oramp1, /dev/mapper/oramp2, /dev/mapper/oramp3 and /
dev/mapper/oramp4.
4. Enable the multipathd daemon to start at system boot.
# chkconfig multipathd on
# chkconfig --list multipathd
multipathd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
5. The mapping of these device WWIDs to their alias names will now persist across reboots. For
example:
# ls -la /dev/mapper/oramp*
brw-rw---- 1 root disk 253, 6 May 26 00:17 /dev/mapper/oramp1
brw-rw---- 1 root disk 253, 7 May 26 00:17 /dev/mapper/oramp2
brw-rw---- 1 root disk 253, 8 May 26 00:17 /dev/mapper/oramp3
brw-rw---- 1 root disk 253, 9 May 26 00:17 /dev/mapper/oramp4
# multipath -ll
oramp1 (1IET_00010004) dm-6 IET,VIRTUAL-DISK
size=20.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 8:0:0:4 sde 8:64 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
`- 9:0:0:4 sdbl 67:240 active ready running
oramp3 (1IET_00010006) dm-8 IET,VIRTUAL-DISK
size=20.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 8:0:0:6 sdg 8:96 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
`- 9:0:0:6 sdbn 68:16 active ready running
oramp2 (1IET_00010005) dm-7 IET,VIRTUAL-DISK
size=20.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 8:0:0:5 sdf 8:80 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
`- 9:0:0:5 sdbm 68:0 active ready running
oramp4 (1IET_00010007) dm-9 IET,VIRTUAL-DISK
size=20.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 8:0:0:7 sdh 8:112 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled