--- Simon fgc <[EMAIL PROTECTED]> wrote:
> Hello, > > i have a system where i installed linux sometime back with > partitioning scheme as follows > > [EMAIL PROTECTED] simon]# df -h > Filesystem Size Used > Avail Use% Mounted on > /dev/mapper/VolGroup00-LogVol00 36G 18G 17G 53% / > /dev/hda1 99M 56M > 39M 60% /boot > none 248M 0 > 248M 0% /dev/shm > > Now i need to install windows on the same PC. so kind of resize > /dev/mapper/VolGroup00-LogVol00 drive and then may be using fdisk to > create a new partition. > > I believe there is something we can do with the below commands > > [EMAIL PROTECTED] simon]# man lvresize > [EMAIL PROTECTED] simon]# man dmsetup > > As i don't have a seperate media to take the back up and repartition > the hardisk to install windows, i can not take the risk of loosing > data by using above commands and hence looking for the expert advice. To begin with I would recommend you read the LVM howto http://www.tldp.org/HOWTO/LVM-HOWTO/ being a good starting point. Next to summarize there are three major sections in a LVM namely extents, volumes and volume groups. To understand them more clearly you could think of Physical volumes as hard disk or a software raid device, logical volumes would be equivalent to a partition on that device. These volumes would be internally split into chunks of data which would be called physical or logical extent depending upon what type of volume you are splitting. Using these volumes you create Volume groups which is where you start looking at it from outside the LVM therefore your filesystem sits on the volume group. Any resize activity you do should be supported by the volume group and the filesystem sitting on it and everything else will happen transparently. Now to free space from LVM and have it usable for Windows you need to have a logical volume freed from LVM. If you dont need to pass the whole space to Windows you could ofcourse resize the partition and put part of it back into the LVM. Therefore to resize (shorten) a filesystem on LVM you need to do the following 1. Run pvdisplay on the partition or device you wish to remove and confirm it is not being used (check for "Free PE"). If it has data in it - you need to have spare space in other extents in the VolGroup and then run pvmove. 2. unmount the filesystem 3. Resize the filesystem 4. Run vgreduce to remove the volume from the volume group. 5. Mount the filesystem on the updated volume group. I would recommend you read the HOWTO thoroughly and understand the commands I have mentioned. Since I donot know the structure underneath your volume group and since I dont want you to blindly copy my instructions I have not mentioned the exact syntax to use. I do believe I have mentioned all the steps but dont blame me if I missed any step - it is your data after all :). Mithun __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ ilugd mailinglist -- ilugd@lists.linux-delhi.org http://frodo.hserus.net/mailman/listinfo/ilugd Archives at: http://news.gmane.org/gmane.user-groups.linux.delhi http://www.mail-archive.com/ilugd@lists.linux-delhi.org/
