Dell PowerVault NX3610 User Manual - Page 81

NFS Access Denied To A File Or Directory, Troubleshooting Replication Issues

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NFS Access Denied To A File Or Directory Description Cause Workaround User cannot access the NFS file or directory despite the fact that the user belongs to the group owning the NFS object and the group members are permitted to perform the operation. NFS servers (versions 2 and 3) use the Remote Procedure Call (RPC) protocol for authentication of NFS clients. Most RPC clients have a limitation, by design, of up to 16 groups passed to the NFS server. If a user belongs to more than 16 UNIX groups, as supported by some UNIX flavors, some of the groups are not passed and are not checked by the NFS server and thus the user's access may be denied. A possible way to verify this problem is to use newgrp to temporarily change the primary group of the user and thus ensure it is passed to the server. The simple workaround, although not always feasible, is to remove the user from unnecessary groups, leaving only 16 groups or less. Troubleshooting Replication Issues Replication Configuration Error Description Cause Workaround Replication between the source and destination NAS volumes fails because the source and destination systems' topologies are incompatible. The source and destination systems are incompatible for replication purposes. Upgrade the NAS cluster solution which is down. Verify the source and destination, both the source and destination have the same number of NAS controllers. NOTE: You cannot replicate between a 4 node NAS cluster and 2 node NAS cluster. Replication Destination Cluster Is Busy Description Cause Workaround Replication between the source NAS volume and the destination NAS volume fails because the destination cluster is not available to serve the required replication. Replication task fails because the destination cluster is not available to serve the required replication. Administrators must verify the replication status on destination system. 81

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NFS Access Denied To A File Or Directory
Description
User cannot access the NFS file or directory despite the
fact that the user belongs to the group owning the NFS
object and the group members are permitted to perform
the operation.
Cause
NFS servers (versions 2 and 3) use the Remote Procedure
Call (RPC) protocol for authentication of NFS clients. Most
RPC clients have a limitation, by design, of up to 16 groups
passed to the NFS server. If a user belongs to more than
16 UNIX groups, as supported by some UNIX flavors, some
of the groups are not passed and are not checked by the
NFS server and thus the user's access may be denied.
Workaround
A possible way to verify this problem is to use newgrp to
temporarily change the primary group of the user and thus
ensure it is passed to the server.
The simple workaround, although not always feasible, is to
remove the user from unnecessary groups, leaving only 16
groups or less.
Troubleshooting Replication Issues
Replication Configuration Error
Description
Replication between the source and destination NAS
volumes fails because the source and destination
systems’ topologies are incompatible.
Cause
The source and destination systems are incompatible for
replication purposes.
Workaround
Upgrade the NAS cluster solution which is down. Verify
the source and destination, both the source and
destination have the same number of NAS controllers.
NOTE:
You cannot replicate between a 4 node NAS
cluster and 2 node NAS cluster.
Replication Destination Cluster Is Busy
Description
Replication between the source NAS volume and the
destination NAS volume fails because the destination
cluster is not available to serve the required replication.
Cause
Replication task fails because the destination cluster is
not available to serve the required replication.
Workaround
Administrators must verify the replication status on
destination system.
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