Re: [Xen-users] Xen and iSCSI

[Javier Guerra <javier@xxxxxxxxxxx>]

On Sunday 29 January 2006 7:10 pm, Markus Hochholdinger wrote:
> If i have the partition for my rootfs on multiple dom0s available it could
> accidently be mounted. Or the same domU could be startet on different
> dom0s. That is what i have fear of. But to be able to make live migration
> the partitions have to be available.

yeah, having several volumes on a "don't touch!" mode seems risky.  i guess 
that as long as they're never mounted manually, just referenced in the domU 
definitions it should be safe enough.

also, if the domUs have access to the SAN environment, wouldn't that multiply 
several times the risk?  I mean, if only the dom0 see the SAN, there are as 
many points of confusion as real boxes; but if the domUs see the SAN, any one 
of them could mess with anyone other.

> But as my little network test shows it should be better for performance to
> do it this way.

yeah, very interesting that the dom0 CPU load is bigger as a router (20%) than 
as initiator (15%).  it's also a neat coincidence that the total load adds to 
twice (20+10, opposed to 15).

does anybody have a working bridged network to make a similar test? i'm 
guessing the overhead would be a bit lower, measurable but not too 
significant, maybe 15+10 instead of 20+10.  any bets?

-- 
Javier

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