On Friday, May 18, 2018 at 2:19:09 PM UTC-4, Marek Marczykowski-Górecki wrote:
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> On Thu, May 17, 2018 at 05:57:09PM -0700, Qubes Guy wrote:
> > I've successfully used qvm-block (in Dom0) to attach USB drives to 
> > different VMs (persistently), but I've noticed that Qubes (or Linux) 
> > sometimes gives them to different devices over time. In other words, on 
> > Monday, my BIG_TOSHIBA drive will be on /dev/sda, but it'll be assigned to 
> > /dev/sdj when I boot up on Wednesday. This is throwing off my VeraCrypt / 
> > FreeFileSync backup routine. (Another way of saying this is if I say 
> > "qvm-block attach MyVM sys-usb:sda --persistent" when one of the three 
> > drives I use for MyVM is currently attached to that, this will fail if 
> > Qubes moves that drive to a different device-name (during boot) that isn't 
> > one of the three I previously attached (when I go to start up that VM).
> > 
> > I thought about persistently attaching all 10 of my USB drives to the VM 
> > (some HDs, some flash, one SSD - I never use all of them at once - don't 
> > ask!) because that would certainly fix this problem, but I get the 
> > following error when I try to start the VM: "ERROR: Start failed: XML 
> > error: target 'xvdi' duplicated for disk sources '/dev/sdc' and '/dev/sde', 
> > see /var/log/libvirt/libxl/libxl-driver.log for details".
> > 
> > Note that I did all the persistent attachment commands while the VM was not 
> > running. If I detach all those, start the VM, do the persistent 
> > attachments, shut down the VM and then restart it, I get an error along the 
> > lines of "qrexec process failed to respond in 60 seconds".
> > 
> > So, I guess I'm asking if there's a way to just persistently attach 2 or 3 
> > external USB drives and have them consistently available on the same device 
> > names when I start the VM so VeraCrypt doesn't balk?  (VeraCrypt ultimately 
> > doesn't care what device a drive is attached to (it could be sda - sdj on 
> > my system) because it shows the attached drive as "/media/user/BIG_TOSHIBA, 
> > but if a drive isn't where it's supposed to be, that'll fail.
> > 
> > In case you're curious, the error messages in 
> > /var/log/libvirt/libxl/libxl-driver.log are meaningless to me, but if you 
> > want me to post it, I can.
> > 
> > Any help you guys can give me would be greatly appreciated! Thanks...
> 
> It isn't available yet, related issue:
> https://github.com/QubesOS/qubes-issues/issues/3437
> 
> - -- 
> Best Regards,
> Marek Marczykowski-Górecki
> Invisible Things Lab
> A: Because it messes up the order in which people normally read text.
> Q: Why is top-posting such a bad thing?
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Oops, forgot the link: https://gist.github.com/etes/aa76a6e9c80579872e5f

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