Re: [Xen-users] read only disk option in domUs

[list user <xktnniuymlla@xxxxxxxxxxxxxx>]

list user wrote:
> Hi all,
>
> Successfully running a built from source xen 3.0.2-2 & linux 2.6.16 on
> fedora 4 with lvm.
>
> I'm trying to share a read only /usr across multiple domU's.
>
> Logical volume "/dev/vg0/usr" is read only.  Within the domU's fstab
> /usr is "ro".  Here is the disk option from the domU definition.
>
> disk = [ 'phy:vg0/fc4,hda1,w' ,
>          'phy:vg0/usr,hda2,r' ,
>          'phy:vg0/swap,hda3,w' ]
>
> This fails with an unable to write block error.
>
> Now if the vg0/usr volume is specified with 'w' it works without
> complaint until I try to use it in a different domU.  Then the complaint
> is that it is already in use in another guest domain.
>
> Q 1: is inability to specify a phy: as read only a bug?
> Q 2: what is the proper way to share/use a read only volume among domU's?
Following up on the resolution:

I tried various combinations of ro/rw at different levels of the 
filesystem hierarchy from lvm -> xen domU -> fstab using ext2 & ext3.
The only thing that worked for me 'read-only' was "ext2" formatting.

That said, the other domU's now *happily* share /usr.

:m)

> Thanks for any help,
> Mike Wright
>
>
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