In the GFS Shared File System, the MDS communications needed to obtain meta-data and to maintain consistency are processed through the LAN.
Set up the LAN path while keeping the following in mind.
LAN traffic volume and LAN load
Redundant Configuration Definition for a LAN fault
The GFS Shared File System has been designed in order not to increase the LAN load. But, the load intensity can be high under certain operation conditions. When a higher load is imposed on the LAN due to another processing, the more response time may be consumed in accessing the GFS Shared File System.
The LAN load status can be checked with the following commands:
[RHEL6] netstat(8)
[RHEL7] ip(8)
The use of the following is recommended when the load on a file system is large or when the response time is more important than other factors.
High-speed LAN
Private LAN
In the GFS Shared File System, specific nodes blockade the file systems if an error occurs in the communications between MDS and node AC. This is done because AC determines file system processing cannot be continued. To avoid problems in the communication paths, it is recommended to establish a multiplex communication path using Redundant Line Control Function of Global Link Services (hereinafter GLS).
See
For more information about the selection and settings of GLS redundant line switching mode, see "PRIMECLUSTER Global Link Services Configuration and Administration Guide: Redundant Line Control Function."
