[gpfsug-discuss] Problems with remote mount via routed IB

[Aaron Knister]

Hi Jan Erik,

It was my understanding that the IB hardware router required RDMA CM to 
work. By default GPFS doesn't use the RDMA Connection Manager but it can 
be enabled (e.g. verbsRdmaCm=enable). I think this requires a restart on 
clients/servers (in both clusters) to take effect. Maybe someone else on 
the list can comment in more detail-- I've been told folks have 
successfully deployed IB routers with GPFS.

-Aaron

On 2/26/18 11:38 AM, Sundermann, Jan Erik (SCC) wrote:
> 
> Dear all
> 
> we are currently trying to remote mount a file system in a routed Infiniband test setup and face problems with dropped RDMA connections. The setup is the following:
> 
> - Spectrum Scale Cluster 1 is setup on four servers which are connected to the same infiniband network. Additionally they are connected to a fast ethernet providing ip communication in the network 192.168.11.0/24.
> 
> - Spectrum Scale Cluster 2 is setup on four additional servers which are connected to a second infiniband network. These servers have IPs on their IB interfaces in the network 192.168.12.0/24.
> 
> - IP is routed between 192.168.11.0/24 and 192.168.12.0/24 on a dedicated machine.
> 
> - We have a dedicated IB hardware router connected to both IB subnets.
> 
> 
> We tested that the routing, both IP and IB, is working between the two clusters without problems and that RDMA is working fine both for internal communication inside cluster 1 and cluster 2
> 
> When trying to remote mount a file system from cluster 1 in cluster 2, RDMA communication is not working as expected. Instead we see error messages on the remote host (cluster 2)
> 
> 
> 2018-02-23_13:48:47.037+0100: [I] VERBS RDMA connecting to 192.168.11.4 (iccn004-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 index 2
> 2018-02-23_13:48:49.890+0100: [I] VERBS RDMA connected to 192.168.11.4 (iccn004-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 2
> 2018-02-23_13:48:53.138+0100: [E] VERBS RDMA closed connection to 192.168.11.1 (iccn001-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 error 733 index 3
> 2018-02-23_13:48:53.854+0100: [I] VERBS RDMA connecting to 192.168.11.1 (iccn001-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 index 3
> 2018-02-23_13:48:54.954+0100: [E] VERBS RDMA closed connection to 192.168.11.3 (iccn003-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 error 733 index 1
> 2018-02-23_13:48:55.601+0100: [I] VERBS RDMA connected to 192.168.11.1 (iccn001-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 3
> 2018-02-23_13:48:57.775+0100: [I] VERBS RDMA connecting to 192.168.11.3 (iccn003-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 index 1
> 2018-02-23_13:48:59.557+0100: [I] VERBS RDMA connected to 192.168.11.3 (iccn003-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 1
> 2018-02-23_13:48:59.876+0100: [E] VERBS RDMA closed connection to 192.168.11.2 (iccn002-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 error 733 index 0
> 2018-02-23_13:49:02.020+0100: [I] VERBS RDMA connecting to 192.168.11.2 (iccn002-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 index 0
> 2018-02-23_13:49:03.477+0100: [I] VERBS RDMA connected to 192.168.11.2 (iccn002-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 0
> 2018-02-23_13:49:05.119+0100: [E] VERBS RDMA closed connection to 192.168.11.4 (iccn004-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 error 733 index 2
> 2018-02-23_13:49:06.191+0100: [I] VERBS RDMA connecting to 192.168.11.4 (iccn004-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 index 2
> 2018-02-23_13:49:06.548+0100: [I] VERBS RDMA connected to 192.168.11.4 (iccn004-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 2
> 2018-02-23_13:49:11.578+0100: [E] VERBS RDMA closed connection to 192.168.11.1 (iccn001-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 error 733 index 3
> 2018-02-23_13:49:11.937+0100: [I] VERBS RDMA connecting to 192.168.11.1 (iccn001-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 index 3
> 2018-02-23_13:49:11.939+0100: [I] VERBS RDMA connected to 192.168.11.1 (iccn001-gpfs in gpfsstorage.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 3
> 
> 
> and in the cluster with the file system (cluster 1)
> 
> 2018-02-23_13:47:36.112+0100: [E] VERBS RDMA rdma read error IBV_WC_RETRY_EXC_ERR to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 vendor_err 129
> 2018-02-23_13:47:36.112+0100: [E] VERBS RDMA closed connection to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 due to RDMA read error IBV_WC_RETRY_EXC_ERR index 3
> 2018-02-23_13:47:47.161+0100: [I] VERBS RDMA accepted and connected to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 3
> 2018-02-23_13:48:04.317+0100: [E] VERBS RDMA rdma read error IBV_WC_RETRY_EXC_ERR to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 vendor_err 129
> 2018-02-23_13:48:04.317+0100: [E] VERBS RDMA closed connection to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 due to RDMA read error IBV_WC_RETRY_EXC_ERR index 3
> 2018-02-23_13:48:11.560+0100: [I] VERBS RDMA accepted and connected to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 3
> 2018-02-23_13:48:32.523+0100: [E] VERBS RDMA rdma read error IBV_WC_RETRY_EXC_ERR to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 vendor_err 129
> 2018-02-23_13:48:32.523+0100: [E] VERBS RDMA closed connection to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 due to RDMA read error IBV_WC_RETRY_EXC_ERR index 3
> 2018-02-23_13:48:35.398+0100: [I] VERBS RDMA accepted and connected to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 3
> 2018-02-23_13:48:53.135+0100: [E] VERBS RDMA rdma read error IBV_WC_RETRY_EXC_ERR to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 vendor_err 129
> 2018-02-23_13:48:53.135+0100: [E] VERBS RDMA closed connection to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 due to RDMA read error IBV_WC_RETRY_EXC_ERR index 3
> 2018-02-23_13:48:55.600+0100: [I] VERBS RDMA accepted and connected to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 3
> 2018-02-23_13:49:11.577+0100: [E] VERBS RDMA rdma read error IBV_WC_RETRY_EXC_ERR to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 vendor_err 129
> 2018-02-23_13:49:11.577+0100: [E] VERBS RDMA closed connection to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 due to RDMA read error IBV_WC_RETRY_EXC_ERR index 3
> 2018-02-23_13:49:11.939+0100: [I] VERBS RDMA accepted and connected to 192.168.12.5 (iccn005-ib in gpfsremoteclients.localdomain) on mlx4_0 port 1 fabnum 0 sl 0 index 3
> 
> 
> 
> Any advice on how to configure the setup in a way that would allow the remote mount via routed IB would be very appreciated.
> 
> 
> Thank you and best regards
> Jan Erik
> 
> 
> 
> 
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> 

-- 
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776