Re: USB external Hard disk - May be LVM

From: Antonio Montagnani (anto.montagnani_at_virgilio.it)
Date: 03/20/05

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    Date: Sun, 20 Mar 2005 21:24:13 +0100
To: For users of Fedora Core releases <fedora-list@redhat.com>

    Jim Cornette ha scritto/wrote il giorno/on 20/03/2005 11:13:

    > Antonio Montagnani wrote:
    >
    >> I installed FC3 (fresh install) on external USB hard disk (see
    >> different post) , now i moved the HD to another Fedora machine (that
    >> is un upgrade from FC2)
    >>
    >> USB hard disk is immediately connected to the system but I see only a
    >> /boot(2) partition.
    >> I suppose that other directories are LVM type.-How can I see other
    >> partitions??
    >>
    >
    > Using Felipe's directions from an earlier discussion, I had to do this
    > myself. The labels were the same, so /dev/mapper did not recognize
    > them on startup.
    >
    > Here is what I did to see the lvm volume from the other disk.
    >
    > Directions from Felipe: (This works with secondary drive mounts also)
    >
    > Once booted into text-mode rescue, invoke the following commands:
    >
    > lvm lvscan
    > lvm vgchange -ay
    >
    > This will scan for all LVM volumes and then will make them active and
    > accessible.
    >
    > lvm vgchange -an
    >
    > will deactivate them all.
    >
    >
    > Additional steps that I had to do;
    > Perform the step above to activate the lvm.
    >
    > Make a mounting point directory, such as /mnt/logvol
    > mkdir /mnt/logvol
    >
    > mount the volume with your resulting device name, for me it was
    > mount /dev/VolGroup00/LogVol00 /mnt/logvol
    >
    > Change to the /mnt/logvol directory and you should see the content of
    > the disk there.
    >
    > When done with disk, change to a different directory to allow the
    > drive to be unmounted, then:
    > umount /dev/VolGroup00/LogVol00 /mnt/volg
    >
    > If you have other volumes with similar names, I don't think this
    > would work.
    >
    > On my new system, I changed to using conventional partitioning. There
    > were no duplicate lvms to deal with.
    > This disk was a laptop disk mounted in a USB to IDE bookdrive device.
    > I was able to transfer desired information from the drive mounted
    > above using this method. If you have lvm on the new installation also,
    > you might need to use lvm help for other options.
    > lvm help
    > should list the other options.
    >
    > Jim
    >
    Tnx Jim

    As now it is too late to start this task, let me resume what I am aiming
    to and what is my experience...

    1) I am trying to set up a Fedora on an external USB hard disk
    2) I do want that the system will start Fedora immediately if the
    external disk is connected (otherwise Windows should run)
    During installation I decided not to install Grub as my goal is to have
    a system booting Linux when the external HD i sconnected otherwise
    Windows must be started. No choices to the user....and I want to be
    connect to any system (mainly laptops) and use Linux

    Therefore I installed Fedora on this HD issuing the command:
    Linux expert noacpi

    When I rebooted the system, of course it didn't boot (USB booting is
    available).

    I tried to follow instructions at www.simonf.com/usb but I got lost.
    When I issued the command
    mkinitrd --preload=ehci-hcd --preload=usb-storage --preload=scsi_mod
    --preload=sd_mod /boot/usbinitrd.img 2.6.9-1.667

    But the system didn't boot !!!
    So I decided to check what was in the /boot directory and I didn't find
    the usbinitrd.img file.
    I suppose that I will have to issue the modified command mkinitrd.

    At this point I realized that I couldn't see other directories..

    What is your suggestion?? to play a fresh installation with standard
    partitions (how do you manage them???) or making them active following
    your instructions?
    Tnx 

    -- 
 Antonio M.
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