This is probably one of the best reasons to use LVM.

Do some research on LVM and the benefits you can get from using it - 
specifically the ability to easily resize 'partitions' (volumes in LVM 
talk) and easily manage space.

My system has a 2Tb RAID6 that has approx 10 different volumes for 
different Xen DomUs and it is a piece of cake to add/remove/resize 
volumes on the fly.

I've found messing with partitions directly on a disk can be quite 
troublesome - especially if you need to modify things later...

-- 
Steven Haigh

Email: [log in to unmask]
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

On 3/06/2011 10:16 PM, James Holland wrote:
> I'm quite lazy and use Gparted to do this stuff. You can install it by
> doing yum install gparted. You can then see your disks and partitions
> and create and label /home on your free 4TB partition. Then edit
> /etc/fstab. Let us know if you need further help!
>
> On 03/06/11 12:40, Sunil M. Dogra wrote:
>>
>>
>> Hi James Holland,
>> Thank you so much for email
>> Could you please tell me how I will see that 4TB is free.
>> As I have 12x1TB disk mounted as a single disk. Out of 12TB I have used
>> 8TB as /export,
>>
>> Thank you
>> With Best Regards
>> sunil
>>
>>
>>
>> On Fri, Jun 3, 2011 at 4:20 PM, James Holland <[log in to unmask]
>> <mailto:[log in to unmask]>> wrote:
>> So, just mount your 4TB on /home. Stick it in the fstab as LABEL=/home
>> /home ext3 defaults 1 2
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On 03/06/11 08:39, vivek chalotra wrote:
>>
>> Oh u have done automatic disk partitioning...u have not created
>> seperate mount point for users.
>>
>> Vivek Chalotra
>> GRID Project Associate,
>> High Energy Physics Group,
>> Department of Physics & Electronics,
>> University of Jammu,
>> Jammu 180006,
>> INDIA.
>>
>>
>> On Fri, Jun 3, 2011 at 12:49 PM, Sunil M. Dogra
>> <[log in to unmask] <mailto:[log in to unmask]>
>> <mailto:[log in to unmask] <mailto:[log in to unmask]>>> wrote:
>>
>>
>> Hi
>> Following is my /etc/fstab and donot see the /home. now how
>> will I
>> manage quota for users
>>
>>
>> LABEL=/ / ext3
>> defaults 1 1
>> LABEL=/export /export ext3
>> defaults 1 2
>> LABEL=/opt /opt ext3
>> defaults 1 2
>>
>> LABEL=/boot /boot ext3
>> defaults 1 2
>> tmpfs /dev/shm tmpfs
>> defaults 0 0
>> devpts /dev/pts devpts
>> gid=5,mode=620 0 0
>> sysfs /sys sysfs
>> defaults 0 0
>> proc /proc proc
>> defaults 0 0
>> LABEL=SW-cciss/c0d0p2 swap swap
>> defaults 0 0
>>
>>
>>
>>
>> Regards
>> sunil
>>
>>
>>
>>
>>
>> On Fri, Jun 3, 2011 at 12:42 PM, vivek chalotra
>> <[log in to unmask] <mailto:[log in to unmask]>
>> <mailto:[log in to unmask] <mailto:[log in to unmask]>>> wrote:
>>
>>
>> Dear Sunil Sir,
>>
>> Here are answers to your questions:-
>>
>> 1. DO an entry in /etc/fsab for /home like the
>> following, but
>> make sure where it is actually mounted:-
>> # cat /etc/fstab
>>
>> LABEL=//ext3defaults1 1
>>
>> /dev/VolGroup00/LogVol00 /homeext3defaults,usrquota1 2
>>
>> LABEL=/home/homeext3defaults1 2
>>
>> LABEL=/boot/bootext3defaults1 2
>>
>> tmpfs/dev/shmtmpfsdefaults0 0
>>
>> devpts/dev/ptsdevptsgid=5,mode=6200 0
>>
>> sysfs/syssysfsdefaults0 0
>>
>> proc/procprocdefaults0 0
>>
>> LABEL=SWAP-sda5swapswapdefaults0
>>
>>
>> # mount –o remount /home
>>
>> # quotacheck –a /home (It will create a database file
>> aquota.user at /home)
>>
>> # quotaon /home (means we have applied quota on /home)
>>
>> # edquota –u username (to apply quota on a particular user).
>>
>> # edquota sunil
>>
>> File Systemblockssofthardinodessofthard
>>
>> /dev/mapper/VolGroup00-LogVol00721000000001000000001800
>>
>> # edquota –t(To apply grace period)
>>
>> Filesystemblock grace periodinode grace period
>>
>> /dev/mapper/VolGroup00-LogVol007 days7 days
>>
>>
>>
>> 2. Mount the 4TB free space in some mount point and then
>> create
>> ext3 file system in it using fdisk or
>> any other disk management tool.
>>
>> Regards
>> Vivek Chalotra
>> GRID Project Associate,
>> High Energy Physics Group,
>> Department of Physics & Electronics,
>> University of Jammu,
>> Jammu 180006,
>> INDIA.
>>
>>
>>
>> On Fri, Jun 3, 2011 at 10:45 AM, Sunil M. Dogra
>> <[log in to unmask] <mailto:[log in to unmask]>
>> <mailto:[log in to unmask] <mailto:[log in to unmask]>>> wrote:
>>
>> Hi,
>> Two Questions:
>>
>> 1. I would like to give specific disk space to users
>> but I
>> don't have /home in /etc/fstab. I will appreciate if
>> some
>> one will suggest me how to do disk quota management.
>>
>> 2. During SL5.5 installation I used 8TB disk space
>> and kept
>> the 4TB disk space free, Now I want to use this 4TB as
>> scratch, how will I do that.
>>
>>
>>
>> Thank you
>> With Best Regards
>> sunil
>>
>>
>>
>>
>>
>