Which Linux Partition?

I’m trying to upgrade a system’s Grid Infrastucture to the latest/greatest version. The OUI says that I need 7GB of free space and I’m a little short. This is on virtual machines so we can grow the disk easily enough. Everything is installed in the root partition (this isn’t production) and my SysAdmin is asking me if he needs to grow /dev/sda1 or /dev/sda2. Well the disk device is /dev/sda which is the first disk device on the system. This disk device has two partitions, named sda1 and sda2. Which partition is for the root file system? Today, I stumbled across the lsblk command which shows me exactly how this disk is partitioned. The lsblk command is short for List Block Devices. Here is the output on my system.

lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda    8:0    0   42G 0 disk
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└─sda2 8:2    0 31.6G 0 part /
sr0   11:0    1 1024M 0 rom

The output above clearly shows that sda1 is for the boot partition and sda2 is for the root partition.