Re: [Xen-users] best practices in using shared storage forXENVirtualMachines and auto-failover?

[John Madden <jmadden@xxxxxxxxxxx>]

> Then you tell VM1 to migrate to HostB.
>
> Does HostB already have the iSCSI initiator running?  Does it get
> started when the migration starts?  What happens to the initiator on
> HostA?
Yes, both dom0's should be connected to the storage and be able to see 
it at all times.  You have to fence or otherwise "uhm, guarantee" that 
only one dom0 will be writing to the block devices at any point in time. 
 cLVM won't do this for you but other components of the cluster 
services will.
> I understand how it works with an NFS share and a disk image file.
> It's the whole "exported block device on the network" bit that's
> messing me up.
Try to not distinguish too much between the two in this case.  You can't 
go writing to a block device from two different hosts at the same time 
without a cluster filesystem, but even live migration doesn't allow such 
writes anyway.
John




--
John Madden
Sr UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden@xxxxxxxxxxx

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