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The command df -h says following

Filesystem            Size  Used Avail Use% Mounted on
                       18G  3.3G   14G  20% /
/dev/sda1              99M   12M   82M  13% /boot
tmpfs                 506M     0  506M   0% /dev/shm

I want to create the new partition

also when i do fdisk /dev/sda1 then it says device not loaded

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up vote 0 down vote accepted

I think you want:

fdisk /dev/sda

You want the disk (/dev/sda) not the first partition (/dev/sda1). This will be outside the lvm stuff that you are using for your root volume

You are using LVM (Logical Volume Manager). You have Logical volume in a Volume group VolGroup00. If you want to add a volume to the volume group you will have to use pvdisplay to find out how much space is used on the physical device and go from there.

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I want to create the new partition

Your system is using LVM, so start with the man page for lvm(8) and read its references (especially lvcreate).

also when i do fdisk /dev/sda1 then it says device not loaded

fdisk works on block devices, not on partitions. Try fdisk /dev/sda.

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Use vgdisplay to find if there is any more space. If so you can create a partition. I would first mount it on /mnt and copy everything over.

e.g. if you are going to create /tmp

vgdisplay (find space available) lvcreate (create LVM) mkfs [lv] (create filesystem) mount [lv] /mnt mv /tmp/* /mnt/ mv /tmp/.??* /mnt/ umount /mnt mount [lv] /tmp

Kind of thing

If vgdisplay shows you have no space available, you will need to boot into a rescue mode off install dvd, reduce the / filesystem, then reduce the LV, then you will have space to create a new LV

That's a little trickier. See my blog post for more details on that portion

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