swapgen vdisk fails to initialize after installation with the following message "swapon: /dev/dasdX: stat failed: No such file or directory" in Red Hat Enterprise Linux 6

Issue

1. swapgen vdisk fails to initialize after installation with the following message "swapon: /dev/dasdX: stat failed: No such file or directory" in Red Hat Enterprise Linux 6

During/after installation, this swapgen vdisk 300 is added as /dev/dasdf in /etc/fstab

/dev/dasdf              swap                    swap    defaults        0 0

After installation, the device is detected as dasdb. Snip from lsdasd

Bus-ID     Status      Name      Device  Type  BlkSz  Size      Blocks
==============================================================================
0.0.0300   active      dasdb     94:4    FBA   512    2047MB    4194296

Executing swapon /dev/dasdf results in

[root@test tmp]# swapon -a
swapon: /dev/dasdf: stat failed: No such file or directory