Re: [Xen-users] xen, iscsi and resilience to short network outages

["Steve Feehan" <sfeehan@xxxxxxxxx>]

On 11/13/06, John Madden <jmadden@xxxxxxxxxxx> wrote:
> > Would I stand a better chance connecting to the iSCSI LUN from domU
> > rather than from dom0? My thought is that since the dom0 is able to
> > reconnect to the LUN when the network returns, perhaps this would be
> > the case for domU as well?
>
> Why would you *not* leave all of the iSCSI work to the domU?  It seems
> like that would provide better predictability performance-wise (i.e.,
> leaving your I/O to the built-in scheduling rather than everyone getting
> a whatever's-available slice of dom0's cpu time).
Because it is not tolerant to short network outages? :)

Perhaps that is an excellent point, though I'm not familiar with IO
scheduling. But if pushing the IO up to domU makes it more reliable
then I might be able to tolerate a small loss in IO performance. This
presumes that it will be more reliable, which I won't have time to
test right away.

--
Steve Feehan

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