Oracle says that about 2.5 GB of disk space should be reserved for the Oracle software on Linux.
Here are examples to check a file system:
$ du -m -s /u01
$ du -m -s /u01/app/oracle/oradata
If you also install additional software from the Oracle Database 10g Companion CD, then add at least 1 GB of free disk space.
So if you install Oracle 10g Enterprise Edition and additional software from the Oracle Database 10g Companion CD, then you need about 2.5 GB of disk for the Oracle software. And if you also want to add a pre-configured database on the same file system, make sure to add another 1 GB of disk space.
If you do not put Oracle 10g on a separate file systems, then make sure the root file system "
/" has enough disk space. You can check the free space of the root file system with the following command:
df -h /