Re: [Xen-devel] Unstableness in grant table block drivers

[Kip Macy <kip.macy@xxxxxxxxx>]

> Sure, good point (though as mentioned above, we hadn't seen any
> problems ourselves -- we strongly appreciate the community effort
> in helping us ensure new changes work on a broad range of configs
> and usage scenarios).

I think it is safe to say that the blkback/blkfront still have some
serious bugs to be fixed even in the absences of grant tables.
Exporting more than a couple of block devices to VMs will eventually
cause domUs to stop receiving block I/O. I hope to have time to create
a  scenario that works quicktly and with a sufficiently small
configuration that you'll be able to reproduce it there. To date I've
only tried it with a fairly large number of LUNs.

Developers using xen here periodically have to re-boot their machines
as a result. They can't reproduce it consistently (thankfully), but
they're typically only using 7-10 VBDs.


                   -Kip

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