Question : Want to reallocate disk areas in LINUX

I have a 40GB VMware virtual Linux drive allocated so only about 2Gb is alocated to /opt (dev/sda2): I need more space for /opt and I would like to reallocate about 60% of the space from /home or, alternatively, reassign /opt to /dev/sda3  (the location home is on).

Thanks for your help

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda2              3960348   1966684   1789240  53% /
/dev/sda3             34640104   4620328  28231744  15% /home
/dev/sda1                46633     10387     33838  24% /boot
tmpfs                   517644         0    517644   0% /dev/shm
[root@localhost ~]#
[root@localhost ~]# df /opt
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda2              3960348   1966684   1789240  53% /
[root@localhost ~]#

Answer : Want to reallocate disk areas in LINUX

Note that your /opt partition is not actually a separate partition, but simply a directory in your root partition.

Since you're not using a logical volume manager, what you are really asking is if you can increase the size of your root partition.  This would involve moving your entire /home partition, which is fairly large.  I'm and old fart and may be out of touch, but generally in my experience, you're not going to be able to move the start of that /home filesystem on sda3 to a later spot on that partition without having to migrate the data there.

The absolute easiest thing to do would be to transfer the /opt data to /home (/home/opt) and simpliy make a symlink to it (rsync -av /opt /home; mv /opt /opt/old; ln -s /home/opt /opt).  Not the prettiest, but probably the simplest to accomplish