Operations against a dNFS mounted NetApp volume fails with ENETUNREACH

Asset ID:	1-72-2144881.1
Update Date:	2016-05-31
Keywords:

Solution Type Problem Resolution Sure

Solution 2144881.1 : Operations against a dNFS mounted NetApp volume fails with ENETUNREACH

Applies to:

Exadata X5-2 Quarter Rack - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

Problem Summary
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Any operations such as export or file copy will fail with ENETUNREACH

Problem Description
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When performing operations against a dNFS mounted volume existing on a NetApp server will hang if static routes are not being used.

Cause

If any operation is hanging against a dNFS mounted volume existing on a NetApp server and the strace file of such a hanging operation shows:

connect(32, {sa_family=AF_INET, sin_port=htons(2049), sin_addr=inet_addr("10.206.123.69")}, 16) = -1 ENETUNREACH (Network is unreachable)

you must configure a static route to the NetApp volume.

The strace file shows us that we are not able to reach the end-point, we can see:

ENETUNREACH (Network is unreachable)

Solution

1. Remove donotroute from the /etc/oranfstab file
2. Add a static route to the NetApp server in the network configuration file /etc/sysconfig/network-scripts/route-eth0

3. Restart the network with:

# /sbin/service network restart

References

<BUG:17779963> - EXPDP HANGS IN DEFINING STATE ON NFS MOUNT SHARE
<BUG:14125880> - EXPDP HANGING ON DNFS
<NOTE:1183635.1> - How to Add Static Route on OL5

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