[Xen-users] Persistent block device naming by UUID

[Predrag Punosevac <punosevac72@xxxxxxxxx>]

Hi,

xen1:~# uname -a
Linux xen1.int.autonlab.org 4.9.65-1-hardened #2-Alpine SMP Mon Nov 27
15:36:10 GMT 2017 x86_64 Linux

xen1:~# apk info xen
xen-4.11.1-r1 description:
Xen hypervisor

xen-4.11.1-r1 webpage:
https://www.xenproject.org/

xen-4.11.1-r1 installed size:
47734784

xen1:/etc/xen/my-guests/auto# more ubuntu-16.04-observium-ng.cfg 
type = "hvm"
name = "observium-ng"
vcpus=8
memory = 32768 
vif = [ 'mac=12:16:3e:0d:98:96, bridge=br0', 'mac=12:16:3e:0d:98:97, 
bridge=br1' ]
disk = [ 'phy:/dev/sdc,xvda,rw' ]
boot = "dc"
on_reboot="restart"
on_crash="restart"


I am reading documentation back and forth in search of a better
persistent naming method. Namely 

disk = [ 'phy:/dev/sdc,xvda,rw' ]

is not persistent between the boots. I like putting my DomUs on a
dedicated block devices (M.2 SSDs) and when one of them dies the disk 
labels are switching on the reboot. Ideally I would like to have
something like

disk = [ 'phy:UUID="839ca898-db1d-4c89-ad3f-faf6909bf448",xvda,rw' ]

instead. That seems to be unsupported

https://xenbits.xen.org/docs/4.11-testing/

I do understand that uuid in Xen lingo is used for something else

https://www.practicalxenserver.org/tutorials/miscellaneous-tutorials/working-with-uuids/

Am I missing here something?

Best,
Predrag



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