[dm-devel] RFC: multipath IO multiplex
Alasdair G Kergon
agk at redhat.com
Mon Nov 8 12:56:38 UTC 2010
On Mon, Nov 08, 2010 at 01:19:41PM +0100, Lars Marowsky-Bree wrote:
> I wonder how other latency-sensitive IO handles multipath? Maybe they
> just haven't noticed yet they'd like a facility like this? ;-)
As usual, it's the lack of a cancellation interface for incomplete I/O
that seems to make the kernel-side option troublesome: we still have
to wait for timeouts. Do we prevent more than one I/O being sent
in this mode, given that any other alternative would have races?
Alasdair
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