/dev/sda1 missing after reboot.

Issue

• 'fdisk -l' shows the partition but it is not listed in /dev directory

$ parted /dev/sda print 
...
Disk /dev/sda: 300GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
 1      512B    1024MB  1024MB  primary  ext4         boot
 2      1024MB  300GB   299GB   primary               lvm

• /dev/ directory shows only /dev/sda, neither /dev/sda1 nor /dev/sda2