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Re: [Xen-users] How to share data between guest domains

  • To: Todd@xxxxxxxxxxxxxxxx
  • From: "Molle Bestefich" <molle.bestefich@xxxxxxxxx>
  • Date: Mon, 20 Mar 2006 13:45:07 +0100
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 20 Mar 2006 12:46:31 +0000
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Todd D. Esposito wrote:
> However, on that note, I wonder if you could mount the same file system,
> say something like /usr, into multiple domU's READ ONLY.

That works for me.

What doesn't work is mounting that file/device READ/WRITE in one domU
to update the filesystem.  For that, I have to take down *all* domUs. 
Not good...

(When I try I get a vbd: error saying "already in use".)

(I know about caching and that I need eg. a cluster-aware filesystem
to do this.)

I've spent a couple of hours hunting through various Xen source files.
 There's a lot of Python functions that are only 3-5 lines long and
which does little else than calling the next function, which makes it
very hard to figure out what's going on :-/.

Could one of you devel guys please let me know where I need to go to
remove this silly limitation? :-)

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