On 5 Jun 2013, at 15:54, Encore Deng wrote:

> I found if I disconnected the network between nbd-client and nbd-server, the 
> IO in nbd-client will be hung.

Yes, because the client cannot access the server.

> Someone tell me I can try dm-cache for the nbd.
> Does anybody can tell me how to use dm-cache? Is it really useful?

No, because the client still cannot access the server for any uncached blocks.

nbd is not designed to operate when the network is disconnected between client 
and server.

-- 
Alex Bligh





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