More disk space...

If you need more disk space it looks like the EL Linux VMs were supplied with an extra unmounted disk. It is available at /dev/sdb but not partitioned. To make use of it:
# View partition info
vagrant ssh
su
cat /proc/partitions
parted -l
# Partition the unused drive
fdisk /dev/sdb
n
p
1
enter
enter
w
# format
mkfs.ext4 /dev/sdb1
# mount it
mkdir /u01
mount /dev/sdb1 /u01
# update fstab
/dev/sdb1       /u01    ext4    defaults        0       0