Date: Tue, 10 Feb 2015 11:01:07 -0700 From: Ron Croonenberg <ronc@lanl.gov> To: John Nielsen <lists@jnielsen.net>, Ron Croonenberg <ronc@lanl.gov> Cc: freebsd-infiniband@freebsd.org Subject: Re: IBSRP and switches Message-ID: <54DA4763.6070203@lanl.gov> In-Reply-To: <D7E7CC37-B171-469F-B783-BF943C1D1762@jnielsen.net> References: <54DA2F75.3000307@lanl.gov> <D7E7CC37-B171-469F-B783-BF943C1D1762@jnielsen.net>
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On 02/10/2015 10:39 AM, John Nielsen wrote: > On Feb 10, 2015, at 9:19 AM, Ron Croonenberg <ronc@lanl.gov> wrote: > >> From what I understand IBSRP is a point to point protocol and cannot be switched over an IB switch, correct? (and the presented devices cannot be see by initiators 'through' a switch. > > At $work we use SRP over InfiniBand with lots of switches in the mix. Never had an issue. > Ok, I'll try some of that. I assume you were able to see all drives on all ports. What I am trying to do is see all drives on all hosts (connected to a switch). IBSRP seems to be 'point to point' So I wonder if it (ibsrp) will let me mount a drive multiple times. (I am doing this in a 'not so posix' kind of way) >> Is there a 'scsi protocol' that I can run over IB that can be switched? > > Unfortunately, there isn't currently SRP support on FreeBSD. There is RDMA support, so it might be feasible to port the SRP code from Linux, but I haven't really looked in to it. That is why I am looking into it this way, because of RDMA. There is also something called ISER (iSCSI extensions over RDMA) > There's always iSCSI. FreeBSD 10.0 saw the addition of the kernel-based target and initiator (with some improvements since), but I don't think it takes advantage of RDMA or other acceleration techniques when used with InfiniBand. I'd love to be wrong. :) right, but I am trying to go for the highest performance that is reliable. > JN > Ron
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