Re: [Xen-devel] Storage Domain in Xen 4.4

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Mar 07, 2016 at 04:46:39PM -0500, Paul Mogren wrote:
> Hey all,
> 
> I'm trying to get a storage domain up and running in Xen 4.4. I'm currently
> using Ubuntu 14.04 for the dom0, storage domain and guest. I'm currently
> following the steps here,
> http://wiki.xenproject.org/wiki/Storage_driver_domains, but am not having
> any luck.
> 
> *I received this dmesg error on the guest during start-up:*
> xenbus_probe_frontend: Timeout connecting to device: device/vbd/51715
> (local state 3, remote state 2)
> 
> This means the guest (in state 3) is initialised and waiting for a
> connection from a peer, and the storage-domain (in state 2) is finished
> with the early initialisation but is waiting for information from the peer
> or hot-plug scripts. This would imply to me that there is a communication


Right, like actually hooking up the disk (/home/storage/disk.img)?
to the guest.

Do you have anything in the storage domain to process udev? Ah wait you
have 'disable_udev'.

In which case I think you need the xl daemon to act for you?

Roger would know but he is on vacation. CC-ing him just in case.

> error between the xen-blkfront and xen-blkback drivers or an error in the
> scripts.
> 
> *However, on the storage-domain I receive this dmesg:*
> [ 2987.170473] xen-blkback: event-channel 19
> [ 2987.170761] xen-blkback: /local/domain/3/device/vbd/51715:using single
> page: ring-ref 10
> [ 2987.171319] xen-blkback: ring-pages:1, event-channel 19, protocol 1
> (x86_64-abi) persistent grants

> 
> Is this the information that the xen-blkback driver is waiting for? If so,
> why does it not continue through the initialisation process? If not, what
> information is the xen-blkback driver waiting for, and how do I ensure the
> front-end and back-end drivers will establish a connection?
> 
> I've attached the output of xenstore-ls and the dmesg outputs of the guest
> and storage domain.
> 
> Thanks in advanced,
> Paul Mogren

> tool = ""
>  xenstored = ""
> local = ""
>  domain = ""
>   0 = ""
>    name = "Domain-0"
>    domid = "0"
>    memory = ""
>     target = "6833564"
>     static-max = "4294967292"
>     freemem-slack = "247980"
>    device-model = ""
>     0 = ""
>      state = "running"
>    libxl = ""
>     disable_udev = "1"
.. snip..
>   2 = ""
>    vm = "/vm/081ff22d-7f4b-4c46-a6b1-4deed1edc1c2"
>    name = "storage-domain"
>    cpu = ""
>     0 = ""
>      availability = "online"
>     1 = ""
>      availability = "online"
>    memory = ""
>     static-max = "524288"
>     target = "524289"
>     videoram = "-1"
>    device = ""
>     suspend = ""
>      event-channel = ""
>     vbd = ""
..
>    backend = ""
>     vbd = ""
>      3 = ""
>       51715 = ""
>        frontend = "/local/domain/3/device/vbd/51715"
>        params = "/home/storage/disk.img"

>        script = "/etc/xen/scripts/block"
>        frontend-id = "3"
>        online = "1"
>        removable = "0"
>        bootable = "1"
>        state = "2"
>        dev = "xvda3"
>        type = "phy"
>        mode = "w"
>        device-type = "disk"
>        max-ring-page-order = "4"


>   3 = ""
>    vm = "/vm/23918c38-5db7-458d-a151-22726de62710"
>    name = "guest"
>    cpu = ""
>     0 = ""
>      availability = "online"
>     1 = ""
>      availability = "online"
>    memory = ""
>     static-max = "524288"
>     target = "524289"
>     videoram = "-1"
>    device = ""
>     suspend = ""
>      event-channel = ""
>     vbd = ""
.. snip..
>      51715 = ""
>       backend = "/local/domain/2/backend/vbd/3/51715"
>       backend-id = "2"
>       state = "3"
>       virtual-device = "51715"
>       device-type = "disk"
>       protocol = "x86_64-abi"
>       ring-ref = "10"
>       event-channel = "19"
>       feature-persistent = "1"

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