Re: [Xen-users] Live migration?

[Matthew Wild <M.Wild@xxxxxxxx>]

On Tuesday 31 October 2006 10:18, Daniel Nielsen wrote:
> Hi.
>
> I couldn't find much info either :). We use dom0 and domU's that all
> netboot from a single server. The RAM contents of a domU is indeed
> transferred through ethernet from one dom0 to another during migration. Our
> dom0's all have 2 ethernet interfaces and uses one for itself and the other
> as a bridge for all domU.
>
> A sample domU file:
>
> name="moya"
> kernel="/boot/vmlinuz-2.6-xen"
> root="/dev/nfsroot ro"
> memory=256
> vif=[ 'mac=00:00:00:00:FF:01, ip=130.225.53.42' ]
> nfs_server="130.225.53.101"
> nfs_root="/data/diskless/xen-root"
> extra="ip=dhcp"
>
> This means that each domU has no ties to the physical machine, except for
> ethernet, meaning that live migration works like a charm for us.
>
> However, we are currently investigating moving our dom0's and domU's to a
> SAN backed setup as NFS at times is a bottleneck for us.
>
> Does anyone have any pointers where to read somthing about this?
>
All you need is to have consistent and persistent disk naming/labelling on the 
dom0 to use SAN/iSCSI/AoE network storage. We use iSCSI and the in the config 
file, reference the disks as below

disk = 
[ 
'phy:disk/by-id/scsi-1494554000000000000000000030000000d2500000e000000,hda1,w', 
     
'phy:disk/by-id/scsi-1494554000000000000000000030000002c2500000e000000,hdb1,w' ]

Slightly long, and not necessarily easy to work with, but they are the same 
over all the machines connected via ISCSI.

Regards

Matthew
-- 
Matthew Wild                       Tel.: +44 (0)1235 445173
M.Wild@xxxxxxxx                    URL http://www.ukssdc.ac.uk/
UK Solar System Data Centre and
World Data Centre - Solar-Terrestrial Physics, Chilton
Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX

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