Hi shadowlin,

On Wed, 7 Mar 2018 23:24:42 +0800, shadow_lin wrote:

> Is it safe to use active/active multipath If use suse kernel with 
> target_core_rbd?
> Thanks.

A cross-gateway failover race-condition similar to what Mike described
is currently possible with active/active target_core_rbd. It's a corner
case that is dependent on a client assuming that unacknowledged I/O has
been implicitly terminated and can be resumed via an alternate path,
while the original gateway at the same time issues the original request
such that it reaches the Ceph cluster after differing I/O to the same
region via the alternate path.
It's not something that we've observed in the wild, but is nevertheless
a bug that is being worked on, with a resolution that should also be
usable for active/active tcmu-runner.

Cheers, David
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