Re: Making space for another OS.

From: Craig McLean (craig_at_fukka.co.uk)
Date: 11/15/05

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    Date: Tue, 15 Nov 2005 15:50:00 +0000
To: "Bill Rugolsky Jr." <brugolsky@telemetry-investments.com>, For users of Fedora Core releases <fedora-list@redhat.com>

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    Bill Rugolsky Jr. wrote:
    > On Tue, Nov 15, 2005 at 02:45:24PM +0000, Craig McLean wrote:
    >> I'm going to stick Solaris 10 on my laptop (this is not an advocacy
    >> post, just for info) and to do so I need to free up some physical space
    >> on my disk which is currently allocated to LVM2.
    >
    >> 5) with fdisk, delete the partition entry and recreate from same
    >> starting block, but ending the partition ~10Gb short of where it ends now.
    >
    > This will almost certainly hose your system; you need to resize
    > the physical volume (PV). You might be able to do this by doing a
    > resize2fs/lvreduce, making sure that no physical extents (PEs) are in
    > use above some offset (probably the case if it was a linear contiguous
    > allocation), do a vgcfgbackup of the LVM2 metadata (which is in text form;
    > hooray!), hack it to reduce the extent counts, and then do a vgcfgrestore.

    Gotcha. Hopefully once the filesystem is resized down and the lvreduce
    is done, moving the physical partition boundary will not destroy any
    allocated PEs, good call on the vgcfgbackup/restore. I wouldn't know
    where to start working out the new PE count for the restore though...
    Will vgdisplay show me the new PE count after the resize?

    > Alternatively (and "more safely"), you could plug in a USB2 drive, and do a
    > pvmove/vgreduce/pvremove/fdisk/pvcreate/vgextend/pvmove. [I say "more safely"
    > in scare quotes, because using usb-storage for multi-gigabyte copies
    > can cause problems on lots of lousy USB hardware.]

    I have a 40Gb USB2 disk which works well on this box, so maybe I'll
    consider at least mirroring to that first, in case everything goes runny.

    > Finally, it might just be easier to do a full backup and restore, especially
    > if your laptop has a GigE interface.

    Maybe. It's certainly possible as a last resort if everything screws up
    or is going to take more than a couple of hours.

    > If this is only for experimentation, perhaps you might consider installing
    > Solaris 10 to run under Xen? I believe there is a port to Xen domU.

    Nope, permanent change, and this lappy only has 256Mb, so VM's are
    pretty much out of the question.

    You've been a great help, Bill. Thanks indeed!

    Craig.
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