First off: whatever your translation engine is, please switch to another one. I have a hard time second-guessing what you might mean.
Before you begin: PLAN, PLAN, PLAN, then plan again. Write down which application you are going to install, how much space you need for the binaries, how much for the data itself, etc..
Always keep in mind that it is easy to increase the size of a filesystem but hard to make it smaller. Therefore, start out with as little space as possible and increase this to the size necessary.
What you need:
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Boot partition Linux cannot boot from a logical volume, so you need a boot partition to boot from. It should be formatted as "ext3" filesystem and can be very small: 512MB is absolutely enough.
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The rest of the disk goes to one volume group. If i am correct the RedHat installation process will guide you through the creation of the volume group, so just follow the dialog.
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Within the volume group all the other filesystems will be created as logical volumes. You will need:
3A. a swap area: make it the same size as your installed memory. More is not better, just a waste.
3B. a "/" filesystem (ext3 or ext4) for the system itself. 5GB are more than enough, you can make it bigger later if this is necessary.
3C. a "/tmp" filesystem (ext3 or ext4) for temporary files. Start with 1GB and increase as necessary.
3D. a "/opt" filesystem (ext3 or ext4) for the application (binaries). Start with what you have found out the application needs, NOT MORE. Increase if it is too small, but only then.
3E. You mentioned DB2, so you probably need some space for the database itself. Talk to the application people where to mount they want it mounted and how much space you have to provide for this. I suggest you leave that out during installation and create it later, as you don't need it to install the system.
3F. It might be a good idea to have a small filesystem for "/home", so that users can put some scripts in their home directories without taxing the "/" filesystem. You might also consider "/root" to be its own filesystem, because you might need some space for logs, administrative scripts, etc.. Start with 5GB in both cases and increase as necessary.
I hope this helps.
bakunin