Re: Running LVM to repartition HD question

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Stephen Liu wrote:
Hi folks,

I ran LVM partitioning HD at time of installing FC5_64

# fdisk -l
Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14        9729    78043770   8e  Linux LVM

Disk /dev/dm-0: 10.4 GB, 10468982784 bytes
255 heads, 63 sectors/track, 1272 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-0 doesn't contain a valid partition table

Disk /dev/dm-1: 12.5 GB, 12582912000 bytes
255 heads, 63 sectors/track, 1529 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-1 doesn't contain a valid partition table

Disk /dev/dm-2: 8388 MB, 8388608000 bytes
255 heads, 63 sectors/track, 1019 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-2 doesn't contain a valid partition table

Disk /dev/dm-3: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-3 doesn't contain a valid partition table
* end *


# fdisk -l /dev/sda
Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14        9729    78043770   8e  Linux LVM
* end *

# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      9.5G  4.8G  4.3G  53% /
/dev/sda1              99M   16M   79M  17% /boot
tmpfs                 501M     0  501M   0% /dev/shm
/dev/mapper/VolGroup00-LogVol01
                       12G  2.0G  8.9G  19% /home
/dev/mapper/VolGroup00-LogVol02
                      7.6G  146M  7.1G   2% /tmp
* end *


LVM Volume Groups
VolGroup 00		76160
LogVol01	/home	ext3	12000
LogVol02	/tmp	ext3	8000
LogVol00	/	ext3	9984
LogVol03		swap	1024
* end *


During installation I tried to retain an empty primary partition for
LinuxOS to test multi-boot without success.  It needed a mount point
therefore I was compelled to create /tmp.

Now I want to move /tmp back to FC5_64 / and use its space for / of
another LinuxOS and repartition with LVM the unallocated space creating
a partition of 10G for its /home.  Please advise how to proceed.  TIA

Unmount /tmp and remove/comment out the fstab entry for it. Reboot. Your system should come up OK with /tmp on the root filesystem (the /tmp directory already exists).

Once you're happy that that's working, you can delete LogVol02 from your volume group:

# lvremove VolGroup00/LogVol02

That will give you some free space in VolGroup00 that you could use for a second OS install, albeit not a raw partition.

Besides is there any way to create an empty primary partition at time
of installing FC5_64, without mounting it

Just leave some free space on the disk and then you can create new partitions as and when you need them. Your /dev/sda has only two partitions on it, so that's effectively two more primary partitions you could use if there was any free space. Unfortunately you have an LVM physical volume using up all of your free space and there's no clean way of shrinking that, so you'll probably need to use the same volume group for your second install.

Paul.


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