Why does anaconda fail to create the swap partition in %post script during kickstart installation of Red Hat Enterprise Linux 6?

Issue

• The kickstart file contains the following line.

logvol swap --name=lv_swap --vgname=vg_sys --size=1044

• And the %post script is available in the kickstart file which contains the following snippet.

# Add additional swap partitions for priority
TASK='Add additional swap partition on dasdb1'
infolog "$TASK"
mkswap /dev/dasdb1
errorlog "$?"

# Add additional swap partitions for priority
TASK='Add additional swap partition on dasdc1'
infolog "$TASK"
mkswap /dev/dasdc1
errorlog "$?"

# Enable all swap partitions
TASK='Enable dasdb1 swap partitions'
infolog "$TASK"
swapon /dev/dasdb1
errorlog "$?"

# Enable all swap partitions
TASK='Enable dasdc1 swap partitions'
infolog "$TASK"
swapon /dev/dasdc1
errorlog "$?"

• Still post installation, the swap space is as follows.

[root@localhost ~]# free | grep -i swap
Swap:      1212404          0    1212404

[root@localhost ~]# cat /proc/meminfo | grep -i swap
SwapCached:            0 kB
SwapTotal:       1212404 kB
SwapFree:        1212404 kB

• The swap partitions miss /dev/dasdc1 as follows.

[root@localhost ~]# swapon -s
Filename                                Type            Size    Used    Priority
/dev/dm-0                               partition       1081340 0       -1
/dev/dasdb1                             partition       131064  0       2

• Post installation, one can create and enable the swap manually on /dev/dasdc1.