Re: [linux-lvm] Reducing ext3 LV

From: Bryn M. Reeves (breeves_at_redhat.com)
Date: 10/20/05

  • Next message: Rudolf Kastl: "Re: Patching a fedora stock kernel howto!" 
    Date: Thu, 20 Oct 2005 10:38:04 +0100
To: For users of Fedora Core releases <fedora-list@redhat.com>

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    Mark Sargent wrote:
    > Hi All,
    >
    > I'm using ext3 LVM and want to resize a 75GB LV to 20GB. How is this
    > done.? Current data = 5GB. LVMHOWTO only cobers ext2. Cheers.
    >
    > http://tldp.org/HOWTO/LVM-HOWTO/reducelv.html
    >
    > Mark Sargent.
    >

    Well, umm, the answer's right there in the link you posted:

    # umount /home
    # resize2fs /dev/myvg/homevol 524288
    # lvreduce -L-1G /dev/myvg/homevol
    # mount /home

    resize2fs handles both ext2 & ext3 (most of the tools are like this -
    mke2fs & e2fsck got their names before ext3 existed, but both handle
    ext3 as well).

    The only thing is the comment about having to know block sizes is bogus.
    This will work fine:

    umount /mount
    e2fsck -f /dev/myvg/myvol
    resize2fs /dev/myvg/myvol 20G
    lvreduce -L 20G /dev/myvg/myvol
    mount /mount

    Obviously, you need to replace /mount and /dev/myvg/myvol with the
    appropriate mount point & device name for your system. The e2fsck is a
    good idea before doing something like this. iirc, e2fsadm used to do it
    automatically.

    Kind regards,

    Bryn.
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