Hi Andrus, thanks for your answer.
Without bonding, is there any preference for LNET to route from the two interfaces? Even when we bond the two interfaces together, I think LNET should still choose between the different interfaces, although they share the same address. Is there any preference in this situation? Thanks, Teng On Thu, Feb 19, 2015 at 3:55 PM, Andrus, Brian Contractor <bdand...@nps.edu> wrote: > Teng, > > > > I believe it would depend on how you have your interfaces configured. > > > > I seems that you have them both on the same subnet and being accessed by > the same client. > > Is this the case? > > > > If they are on the same subnet, I would expect you would bond them (bond0) > rather than have two separate IPs for them. Then you get to control > how/where the data flows at the networking level. > > > > You may want to check on the nodes to see what they see. (lctl peer_list) > > > > If they are different subnets or networks, you can set that in the options > for the lustre module for lnet. > > For example, we have both ib and tcp. I give ib the priority for the best > performance, but if ib is unavailable, it falls back to tcp. That could > just as well be two Ethernet cards on two networks as well. > > > > > > Brian Andrus > > ITACS/Research Computing > > Naval Postgraduate School > > Monterey, California > > voice: 831-656-6238 > > > > > > > > > > *From:* lustre-discuss-boun...@lists.lustre.org [mailto: > lustre-discuss-boun...@lists.lustre.org] *On Behalf Of *teng wang > *Sent:* Thursday, February 19, 2015 1:28 PM > *To:* lustre-discuss@lists.lustre.org > *Subject:* [Lustre-discuss] Questions about the LNET routing > > > > I have a basic question about the LNET. Will the data belonging > > to the same object be routed from the same interface? For example, > > if a node has multiple network interfaces and two processes are > > running on the same node writing to the same shared file, striped > > across 1 OST. > > Process 1 writes like: > > write chunk1 > > write chunk2 > > > > Process 2 writes like: > > write chunk3 > > write chunk4 > > If Process 1 and Process2 are pinned to two different network interfaces, > > say Eth0 and Eth1. Then from the OSC side, will these chunks be routed > > to the OST from the same interface (E.g. All the four chunks through > > Eth0)? If so, what if they write different objects that come to the same > > OST (E.g. Process1 write File1, Process2 write file2, file1 and file2 are > > striped over the same OST)? > > > > Thanks, > > Teng >
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