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Message-Id: <200708050106.58383.phillips@phunq.net> Date: Sun, 5 Aug 2007 01:06:58 -0700 From: Daniel Phillips <phillips@...nq.net> To: Evgeniy Polyakov <johnpol@....mipt.ru> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: Re: Distributed storage. On Saturday 04 August 2007 09:44, Evgeniy Polyakov wrote: > > On Tuesday 31 July 2007 10:13, Evgeniy Polyakov wrote: > > > * storage can be formed on top of remote nodes and be > > > exported simultaneously (iSCSI is peer-to-peer only, NBD requires > > > device mapper and is synchronous) > > > > In fact, NBD has nothing to do with device mapper. I use it as a > > physical target underneath ddraid (a device mapper plugin) just > > like I would use your DST if it proves out. > > I meant to create a storage on top of several nodes one needs to have > device mapper or something like that on top of NBD itself. To further > export resulted device one needs another userspace NDB application > and so on. DST simplifies that greatly. > > DST original code worked as device mapper plugin too, but its two > additional allocations (io and clone) per block request ended up for > me as a show stopper. Ah, sorry, I misread. A show stopper in terms of efficiency, or in terms of deadlock? Regards, Daniel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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