PowerScale: NFS Intermittently Fails to Insert Export Post Cluster Reboot Leading to Client Mount Failure

Clients attempting to mount or perform an operation on a previously used export receive this error:

# mount -F nfs example.com:/ifs/testexport /tmp
nfs mount: example.com:/ifs/testexport: No such file or directory

# cd /test
-bash: cd: /test: No such file or directory

The following messages may be seen in the nfs.log. Aliases fail to insert the export since the path entries are not present under the LIN tree:

TESTCLUSTER-21 nfs[4900]: [nfs] Failed to insert "/ifs/testexport" for export 36 with status 0xc0000467(STATUS_FILE_NOT_AVAILABLE)

TESTCLUSTER-21 nfs[4900]: [nfs] Problem inserting alias /testexport 0xc0000467 (STATUS_FILE_NOT_AVAILABLE)

There is a relatively low chance of running into this issue, but it has been seen when clusters simultaneously reboot (upgrade, patch install, so on). During NFS start, a syscall is issued to open and load the export. There is a rare chance that the syscall may fail due to the simultaneous reboot, which leads to the failure of loading one or more exports.

A potential workaround is to run a rolling reboot instead of a simultaneous reboot. For example, instead of a simultaneous upgrade, run a rolling upgrade.

To resolve this issue, reload the affected zones. This should be non-disruptive.

isi nfs exports reload --zone=<zone of affected exports>

If the above command does not provide relief, contact Dell PowerScale Support to troubleshoot the issue.

This issue is addressed in the following versions: 

• OneFS 9.2.1.25 and later
• OneFS 9.4.0.16 and later
• OneFS 9.5.0.7 and later