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Knowledge Base

What Is the Service Impact Caused by Changing an N8500's CIFS Cluster Mode from CTDB to Normal

Publication Date:  2018-10-17  |   Views:  377  |   Downloads:  0  |   Document ID:  EKB1001921751

Contents

Issue Description

1. The cluster mode of an N8500 used at a site is CTDB. However, alarms indicating a failure to send CIFS cluster control information are frequently reported. Therefore, the customer is advised to change the cluster mode to Normal.

2. After the cluster mode is changed to Normal, the NFS service and Windows clients' CIFS service work properly, but CIFS shares cannot be mounted to Linux clients using the previous mount command.

Handling Process

To recover Linux clients' CIFS mount service, change the Linux mount command from mount -t cifs -o username=Username -o password=Password //IP/DIR LocalDIR to mount -t cifs -o username=Username -o password=Password //IP address of the node to which the file system belongs/_DIR$ LocalDIR.

Root Cause

After the CIFS cluster mode is changed from CTDB to Normal, the command for mounting CIFS shares to Linux clients needs to be changed. The differences are described as follows:

1. In CTDB mode, the mounted IP address can be the IP address of any node. In Normal mode, the mounted IP address must be the IP address of the node to which the file system belongs.

2. In CTDB mode, the mount path is Dir. In Normal mode, the mount path is _DIR$.

Suggestions

Before changing an N8500's CIFS cluster mode, confirm with the customer whether any Linux clients use the CIFS protocol to mount file systems. If Linux clients use the CIFS protocol to mount file systems, change the mount command.