Xen users - Jul 2006 - Migration error

Hello,

I am to try to make a migration of a DomU between two Nodes. The
configuration that I have is the following one:

 [DomU]
       |
   [LVM]         [LVM]
 [Dom0]      [Dom0]
     \                   /
       \               /
       [SCSI Disk]

The disc scsi is the one that is used for the data of the DomU. Its format
is xfs.
The DomU is formed to have direct access to the card PCI that controls the
disc (it is firewire).
When I do a migration (xm migrate --live domU destination_server) leaves the
following error to me:
Error: /usr/lib/xen/bin/xc_save 10 18 3 0 0 1 failed

 If I make the migration without --live, the error is:
ata1: command 0xea timeout stat 0x50 host_stat 0x0
ata1: command 0x35 timeout stat 0x50 host_stat 0x64
 and the servant does not respond and is necessary to reinitiate it.
This error is about libata module (I think).

it is possible to make the migration as I wish, without having to resort to
the data in NFS?
Some idea of like doing it?

thanks,

Javier.


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> The disc scsi is the one that is used for the data of the DomU. Its format
> is xfs.
> The DomU is formed to have direct access to the card PCI that controls the
> disc (it is firewire).
I would be suprised if this would work. I don''t know much about the
guts
of a firewire card, but it seems to me that XEN would have to know how to
re-initialize the firewire card on the destination machine... as that card
by default is going to either be uninitialized or certainly in another
state. I don''t remember much about firewire buses, but it strikes me
that
one of the machines is likely to be a busmaster (or node zero, or whatever
firewire calls it) and the other will not. Also, I would expect the
hardware would have to be identical... so that the kernel which
auto-probed the firewire card in the first box would still be using the
correct card parameters when it suddenly found itself running on the
second box.

I would expect that you would have better luck hiding the firewire cards
from the domU, either by accessing them from dom0 and exporting a block
device or using some sort of network block device.

-Tom

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