[email protected] wrote:
per the message below MD (or DM) would need to be modified to work
reasonably well with one of the disk components being over an unreliable
link (like a network link)
are the MD/DM maintainers interested in extending their code in this
direction? or would they prefer to keep it simpler by being able to
continue to assume that the raid components are connected over a highly
reliable connection?
if they are interested in adding (and maintaining) this functionality
then there is a real possibility that NBD+MD/DM could eliminate the need
for DRDB. however if they are not interested in adding all the code to
deal with the network type issues, then the argument that DRDB should
not be merged becouse you can do the same thing with MD/DM + NBD is
invalid and can be dropped/ignored
David Lang
As a user I'd like to see md/nbd be extended to cope with unreliable links.
I think md could be better in handling link exceptions. My unreliable memory
recalls sporadic issues with hot-plug leaving md hanging and certain lower level
errors (or even very high latency) causing unsatisfactory behaviour in what is
supposed to be a fault 'tolerant' subsystem.
Would this just be relevant to network devices or would it improve support for
jostled usb and sata hot-plugging I wonder?
David
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