[linux-lvm] Resizing an ext3 file system after extending a logical volume group

[linux-lvm] Resizing an ext3 file system after extending a logical volume group

[Richard Kollmar]

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Dear All:

I apologize if this has been asked before, but I can't find a way to  
search the list archives:

How do you safely resize an ext3 filesystem after extending a logical  
volume?

I am adding a new hard drive to increase the size of my logical  
volume "home1" in logical volume group "home" with LVM2 under Ubuntu  
6.10.1 LTS.  The instructions in the LVM Howto are pretty  
straightforward; the only part that spooks me is the resizing of the  
ext3 filesystem.  This is what I have done so far:

	(installed new hardware & partitioned with fdisk; shows up as /dev/ 
sdb1)
	(backed up the existing logical volume in case something bad happens)

	# pvcreate /dev/sdb1
		  Physical volume "/dev/sdb1" successfully created	

	# vgextend home /dev/sdb1
		  Volume group "home" successfully extended	

	# lvextend -l 357700 /dev/home/home1
		  Extending logical volume home1 to 1.36 TB
		  Logical volume home1 successfully resized

 From what I googled, the next steps are a bit more involved for LVM2  
than the Howto lets on.  Does the following look o.k. to the experts:

	' use a root login, not su or sudo, because /home will be unmounted

	# umount /dev/home/home1	' the next steps should be done off-line

	# e2fsck -C 0 -v dev/home/home1		' make sure the file system is ok

	# tune2fs -O ^has_journal /dev/home/home1	'disable journaling on the  
logical volume

	# resize2fs /dev/home/home1		'do the resizing

	# e2fsck -C 0 -v dev/home/home1		' make sure the file system is  
still ok

	# tune2fs -O has_journal /dev/home/home1		're-enable journaling

	# e2fsck -C 0 -v dev/home/home1		' yes, I am a first-timer and  
somewhat paranoid

	# mount /dev/home/home1 /home	' back on-line

Thanks in advance for any help,

microscope


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Re: [linux-lvm] Resizing an ext3 file system after extending a logical volume group

[malahal]

Depending on your kernel, you may be able to resize a mounted ext3. Just
run resize2fs. It worked fine on my gentoo distro on a plain partition.

Thanks, Malahal.

Richard Kollmar [rkollmar@uiuc.edu] wrote:
>    Dear All:
>    I apologize if this has been asked before, but I can't find a way to
>    search the list archives:
>    How do you safely resize an ext3 filesystem after extending a logical
>    volume?
>    I am adding a new hard drive to increase the size of my logical volume
>    "home1" in logical volume group "home" with LVM2 under Ubuntu 6.10.1 LTS.*
>    The instructions*in the LVM Howto are pretty straightforward; the only
>    part that spooks me is the resizing of the ext3 filesystem.* This is what
>    I have done so far:
>            (installed new hardware & partitioned with fdisk; shows up as
>    /dev/sdb1)
>            (backed up the existing logical volume in case something bad
>    happens)
>            # pvcreate /dev/sdb1
>                    * Physical volume "/dev/sdb1" successfully created
>            # vgextend home /dev/sdb1
>                    * Volume group "home" successfully extended
>            # lvextend -l 357700 /dev/home/home1
>                    * Extending logical volume home1 to 1.36 TB
>                    * Logical volume home1 successfully resized
>    From what I googled, the next steps are a bit more involved for LVM2 than
>    the Howto lets on.* Does the following look o.k. to the experts:
>            ' use a root login, not su or sudo, because /home will be
>    unmounted
>            # umount*/dev/home/home1        ' the next steps should be done
>    off-line
>            # e2fsck -C 0 -v*dev/home/home1                 ' make sure the
>    file system is ok
>            #*tune2fs -O ^has_journal*/dev/home/home1       'disable
>    journaling on the logical volume
>            # resize2fs /dev/home/home1             'do the resizing
>            # e2fsck -C 0 -v*dev/home/home1                 ' make sure the
>    file system is still ok
>            #*tune2fs -O has_journal*/dev/home/home1                're-enable
>    journaling
>            # e2fsck -C 0 -v*dev/home/home1                 ' yes, I am a
>    first-timer and somewhat paranoid
>            # mount*/dev/home/home1 /home   ' back on-line
>    Thanks in advance for any help,
>    microscope

> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

Re: [linux-lvm] Resizing an ext3 file system after extending a logical volume group

[Drew]

Looking at it your planned steps are fine except you don't need to
worry about turning the journal off and then on afterwards. I've done
ext3 resizing operations on LVM many times over the last few years and
*never* experienced issues with the journal.

Remember the journal is there to keep data corruption (and fsck time)
at a minimum if the file system goes down uncleanly. AFAIK, unmounting
an ext3 file system forces the journal to commit itself to disk, which
means the journal is empty during the resize operation anyways.


-Drew