On Jun 28, 2018, at 21:14, yu sun <[email protected]> wrote: > > all server and client that fore-mentioned is using netmasks 255.255.255.224. > and they can ping with each other, for example: > > [email protected]:~$ ping node28 > PING node28 (10.82.143.202) 56(84) bytes of data. > 64 bytes from node28 (10.82.143.202): icmp_seq=1 ttl=61 time=0.047 ms > 64 bytes from node28 (10.82.143.202): icmp_seq=2 ttl=61 time=0.028 ms > > --- node28 ping statistics --- > 2 packets transmitted, 2 received, 0% packet loss, time 999ms > rtt min/avg/max/mdev = 0.028/0.037/0.047/0.011 ms > [email protected]:~$ lctl ping node28@o2ib1 > failed to ping 10.82.143.202@o2ib1: Input/output error > [email protected]:~$ > > and we also have hundreds of GPU machines with different IP Subnet, they > are in service and it's difficulty to change the network structure. so any > material or document can guide me solve this by don't change network > structure.
The regular IP "ping" is being routed by an IP router, but that doesn't work with IB networks, AFAIK. The IB interfaces need to be on the same subnet, you need to have an IB interface on each subnet configured on each subnet (which might get ugly if you have a large number of subnets) or you need to use LNet routers that are connected to each IB subnet to do the routing (each subnet would be a separate LNet network, for example 10.82.142.202@o2ib23 or whatever). The other option would be to use the IPoIB layer with socklnd (e.g. 10.82.142.202@tcp) but this would not run as fast as native verbs. Cheers, Andreas > Mohr Jr, Richard Frank (Rick Mohr) <[email protected]> 于2018年6月29日周五 上午3:30写道： > > > On Jun 27, 2018, at 4:44 PM, Mohr Jr, Richard Frank (Rick Mohr) > > <[email protected]> wrote: > > > > > >> On Jun 27, 2018, at 3:12 AM, yu sun <[email protected]> wrote: > >> > >> client: > >> [email protected]:~$ mount -t lustre > >> node28@o2ib1:node29@o2ib1:/project /mnt/lustre_data > >> mount.lustre: mount node28@o2ib1:node29@o2ib1:/project at /mnt/lustre_data > >> failed: Input/output error > >> Is the MGS running? > >> [email protected]:~$ lctl ping node28@o2ib1 > >> failed to ping 10.82.143.202@o2ib1: Input/output error > >> [email protected]:~$ > > > > In your previous email, you said that you could mount lustre on the client > > ml-gpu-ser200.nmg01. Was that not accurate, or did something change in the > > meantime? > > (Note: Received out-of-band reply from Yu stating that there was a typo in > the previous email, and that client ml-gpu-ser200.nmg01 could not mount > lustre. Continuing discussion here so others on list can follow/benefit.) > > Yu, > > For the IPoIB addresses used on your nodes, what are the subnets (and > netmasks) that you are using? It looks like servers use 10.82.143.X and > clients use 10.82.141.X. If you are using a 255.255.0.0 netmask, you should > be fine. But if you are using 255.255.255.0, then you will run into > problems. Lustre expects that all nodes on the same lnet network (o2ib1 in > your case) will also be on the same IP subnet. > > Have you tried running a regular “ping <IPoIB_address>” command between > clients and servers to make sure that part is working? > > -- > Rick Mohr > Senior HPC System Administrator > National Institute for Computational Sciences > http://www.nics.tennessee.edu > > _______________________________________________ > lustre-discuss mailing list > [email protected] > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org Cheers, Andreas --- Andreas Dilger Principal Lustre Architect Whamcloud
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