Hi,

I have got 1 workstation configured LVM in it we have low disk space in /home partition, and in root we have nearly 800gb space wants to shrink the /root partition and increase the /home partition...

Please help me on this.....

I user Redhat 6 64bit OS

Partition details.......

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
894G 5.1G 843G 1% /
tmpfs 5.8G 448K 5.8G 1% /dev/shm
/dev/sda3 194M 34M 151M 19% /boot
/dev/sda5 4.0G 2.3G 1.5G 61% /home
/dev/sda2 6.0G 5.0G 1.1G 84% /media/OS
/dev/sda1 196M 9.1M 187M 5% /media/DELLUTILITY

Hello,

Have a look at this Beginner's Guide to LVM. It has everything you need, with examples.

Kind regards,

Eric

You can't extend /home there, as /home is not LVM already, however you could migrate to a new LVM logvol after first reducing the size of the existing / one.

So first, shrink the / filesystem and then shrink the Logical Volume it is stored in: http://www.tcpdump.com/kb/os/linux/l...de/shrink.html

then create a new LV for home, a new filesystem on it, and then copy the existing /home data to it, edit /etc/fstab to reflect the alternative location and go from there. Actually, you can probably just directly copy the existing partition to the logical volume instead of messing about too much with it - dd if=/dev/sda5 of=/dev/mapper/VolGroup00-LogVolHOME - for example.

btw, you must not confuse the root partition, "/", with "/root". It's certainly confusing, but the difference is very simple.

Thank for your reply, I can shrink the / partition and i can create the new LVM group for /home ...
But what happens for that previously created /home partition , if i mount the new LVM with /home after unmounting the previously created /home partition....


I have create new users or previously created user will work ????

Hello,

Your best option in my opinion is to mount the new LVM 'home' partition on another mountpoint, for example /tmp/home (create the directory if it doesn't exist) and copy all files, maintaining the permissions (-p or --preserve) from /home to /tmp/home. Next umount both /home and /tmp/home and mount the LVM 'home'partition on /home. Change /etc/fstab to point to the new volume and you should be good to go. Normally you won't have to re-create users or anything like that.

Kind regards,

Eric

Hi, i have redused the LVM size of / to 10 GB how do i create the new lvm.
i am not able to find any free space....

Hello,

What's the output of
Kind regards,

Eric

I don't think this is the best approach actually. As it's one entire filesystem to another he can dd the entire block device across and then just use resize2fs to make it fill the LV.

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Hi have created the lvm in resized space for 10Gb,
but i am not able create pvcreate,vgcreate,vgextend said it is already created..

so i have directly created lv create with Volgroup00 which is created previously....

Is that right what i have created ....

well you've not shown us what you created. as above, show us the output from vgdisplay / lvdisplay

be VERY aware of the differences, you would want an lvcreate, not a vgcreate, as your volume group already exists and is fine.

Hi i have created the LVM with the free space as you said i have created the directory /tmp/home for my /home partition and moved all the files from /home to /tmp/home directory...

and unmounted the /home and mounted my new LVM partition into /home.. and copied all the files from /tmp/home to /home lvm partition now i am not able to login with previously created user account.....

as above, I would STRONGLY suggest cloning the filesystem using dd, as that way, as long as that one command is run correctly and the filesystem is mounted normally, it's basically impossible for it to not work.

Hi,

Thanks for pointing me back to the basics. Completely overlooked that one, my bad.

Kind regards,

Eric

Hello,

You state you moved the files. What exactly did you do? Use the 'mv' command? I mentioned in a previous post cp with the -p or --preserve argument to keep permissions. If you didn't use that then most likely your permissions are all off and you'll need to review them. To avoid these things you'd best take acid_kewpie's advice and use dd.

Kind regards,

Eric

ya, i used the same command "dd" and its working i can able to access /home partition with newly configured lvm all the data are retrieved .....