thanks gnom, i was able to go in as a single user. i tried using th e format command as format>partition
partiton> 1 (which is the root slice) and i was able to change the slice size to 15gb but still will not be able to go in to the sun operating system

Did you backup your / and /export/home filesystems before reformatting ?
Did you grow the / filesystem ?
What errors do you have when booting ?

i had this problem due to lack of size initially. so i thought what i needed to do was to had more space to my slice 0 (root). i did not refomat i only added space from 4gb to 15.0 gb using the partition command. it did not give any error it just keep rebooting. One thing that i knew i did was taht i installed a patch and then restarted the system. This made my root filesystem got full or may be the prob might have come from the patch

I don't think you can simply make the root filesystem larger by just increasing the partition size. If you do this, there will be no complete new filesystem, no format.

Where did you get the idea to do that?

pls do you reckon that i should re-install solaris again. if so can you tell me what i should have done to avoid this stupidity again.

I am a newbie i just thought it was ok to do it like that.

How do u grow a filesystem (root) to become larger. pls enlighten

- watch your system metrics, including file system free size
- backup your file systems regularly
- backup again before any potentially dangerous operation like that one
- make sure your backups are usable
- don't blindly trust everything that is suggested on a forum
- don't experiment new procedures on a production system

Thanks Neo and jlliagre, this is much appreciated