Re: LVM partitions on ax external USB HD
From: Antonio Montagnani (anto.montagnani_at_virgilio.it)
Date: 04/15/05
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Date: Fri, 15 Apr 2005 16:16:18 +0200 To: ja@ee.port.ac.uk, For users of Fedora Core releases <fedora-list@redhat.com>
John Austin wrote / ha scritto on /il 12/04/2005 12:07:
>On Tue, 2005-04-12 at 09:22 +0200, Antonio Montagnani wrote:
>
>
>>Rick Wagner ha scritto / wrote il / on 12/04/2005 00:53:
>>
>>
>>
>>>On Sunday 10 April 2005 2:34 am, Antonio Montagnani wrote:
>>>
>>>
>>>
>>>
>>>>I tried to install Fedora on an external USB HD.
>>>>Of course booting from it didn't work.
>>>>On the disk there are an ext3 partition /boot and a LVM partition
>>>>If I connect the HD to a PC as USB device it is correctly mounted but I
>>>>see only the ext3 partition.
>>>>How can I see also the LVM???
>>>>
>>>>
>
>
>
>>>Since no one else has answered, I'll take a stab. I have used LVM on several
>>>permanent hard drives, but never on removables. However I think what your
>>>looking to do is a udev script. Check out the information on udev. Also
>>>look for hotplug.
>>>
>>>What you'll want your script to do is upon detecting the plugging of your USB
>>>drive, it will want to scan (vgscan/lvscan) the drive for LVM volumes, then
>>>activate the volume (vgchange/lvchange --available=yes).
>>>
>>>I'm not sure what you want to do for unplugging. I expect that you'll need a
>>>script to flush then deactivate the volumes prior to pulling the plug on the
>>>drive.
>>>
>>>As I said, I don't know much about hotplug and udev, but this may give you
>>>some additional search hints.
>>>
>>> --rick
>>>
>>>
>
>
>
>>Rick,
>>
>>Tnx for you reply.
>>
>>There are two separate issues:
>>
>>1) how to manage a LVM partitioned removable device (USB hard disk, key
>>etc.): does it make any sense to have them partitioned as LVM??
>>2) how to install Fedora on a removable device (USB hard disk, for
>>example) and boot off it (with Grub installed on it, in order to have a
>>removable Fedora installation for every occasion)
>>
>>I have not enough skill to solve them. Any idea??
>>
>>--
>>Antonio M.
>>
>>
>Hi
>I may be able to help with the second question
>I have a pdf document which I can email direct if you want
>Let me know
>John
>
>
>
>
>>================================================================================
>>
>>
>
>
>
John, your server bounces me back as spammer!!!! I have an e-mail about
this subject.
Please read the following :
>> Hi John,
>>
>> I have followed all instructions (that are very clear, Tnx a lot),
but after Grub installation, I re-booted the laptop, but It didn't start
from USB removable device!!! and is supports it (As from BIOS and from
manual: never tried to start by USB devices before this installation)
>> I unplugged also the USB drive lead and re-plugged while booting.No
way of USB booting.
>> Any suggestion??
>> This afternoon I will plug the USB disk to another PC to see what
happens.Please note that my USB disk is an EIDE disk inside an EIDE to
USB metallic box.
>>
>> Cheers
>>
>>
>
> Hi Antonio
>
> First question did you get a grub> prompt ??
>
> I am assuming NOT !
>
> This next bit is going to be added to the pdf doc sometime!!!!
>
>
I followed your paper (the only difference was different order of sda
for /boot(sda1), /(sda2), swap (sda3), but I changed related
references): and I arrived very smoothly to exit instruction at end of
point 3.3.5, but I couldn't reboot. I also re-plugged the USB disk
during boot but no way (see 3.3.6)
> Its not ideal but should get you up and booted on the USB without
> touching any other disk. It will also help to test if all is well on
> the USB disk
> This does assume you have access to a Linux box to write a floppy and/or
> a CD
> ##################################33
> I have an Icybox USB2/SATA to PATA box with an old IDE disk in it which
> works fine, so that is probably not a problem
> ######################################
> If you have a floppy drive on your machine you can use it to boot grub.
>
>
No floppy available
> I attach a floppy image that you can write to a blank
> floppy as follows
> dd of=/dev/fd0 if=fd0_grub.img
> Then set the BIOS to boot from floppy
> You should then get a raw grub prompt to type in
> something like
> grub>kernel (hdx,y)/vmlinuz.. ro root=/dev/hdpq
> grub>initrd (hdx,y)/initrd... (the original one not the USB )
> grub>boot
>
> Obviously you should also be able to see if the initrd_usb.gz is there
> etc
> ###############################
> If your machine has no floppy then I also attach a raw bootable ISO CD
> image. It has nothing on it except an image of the floppy.
> It should boot OK and give the grub> prompt just as the floppy.
> I used xcdroast to write the image.iso file to CD
>
> Also tested out direct use of cdrecord
> cdrecord -scanbus
> will show cd/dvd devices
>
> cdrecord dev=ATAPI:1,0,0 speed=8 image.iso
> ATAPI: may not be necessary depending how your cd/dvd is treated
> 1,0,0 to match the output of -scanbus above
> No problems
>
> When booting from CD BIOS understanding of the disks
> and that of Linux may not be the same as booting from USB !!!
> Finding how grub sees the devices is easy
> kernel (hdTAB etc
>
> The value needed by root=/dev/sdXX may require trial
> and error !!!!
>
>
If I succeed to start interactively by CD, if I write a
/boot/grub/grub.conf, should I be able to start up by same CD???
I suppose that if I connect same USB disk to another laptop, chances of
insuccess are great....what do you think???
--
Antonio
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- Previous message: Paul Howarth: "Re: Mounting LVM root disk from rescue disk boot"
- In reply to: John Austin: "Re: LVM partitions on ax external USB HD"
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