rdma connection close/reopen every 5 mins

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Hello, I have setup NFS/RDMA on our infiniband network. The OS is CentOS 6.8 with kernel 2.6.32-696.1.1.el6.x86_64 and I am using rdma/nfs-rdma packages from the OS version 6.9_4.1. The connection is successful:

10.10.11.249:/newwing on /newwing type nfs (rw,rdma,port=20049,addr=10.10.11.249)

except in /var/log/messages I am always seeing this exactly every 5 minutes:
 kernel: rpcrdma: connection to 10.10.11.249:20049 closed (-103)
kernel: rpcrdma: connection to 10.10.11.249:20049 on mlx4_0, memreg 6 slots 32 ird 16

I suppose it is from some service or cron job.... But I wonder how I could keep the connection open so this isn't happening every 5 minutes?

Thanks

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