HP ProLiant DL380G5-WSS 3.7.0 HP StorageWorks HP Scalable NAS File Serving Sof - Page 420

Membership partitions can be added, replaced, or repaired as necessary. For more information, see Manage membership partitions, page 358. Fencing When certain problems occur on a server (for example, hardware problems or the loss of cluster network communications), and the server ceases to effectively coordinate and communicate with other servers in the cluster, HP Scalable NAS must remove the server's access to filesystems to preserve data integrity. This step is called fencing. The fencing method configured on HP StorageWorks 4400 Scalable NAS systems is called fabric-based fencing. When it is necessary to fence a server, HP Scalable NAS disables the server's access in the Fibre Channel fabric. The server must be rebooted to regain access to the SAN. Hardware snapshots HP Scalable NAS is configured to take hardware snapshots or snapclones on the EVA 4400 array. For more information, see Chapter 11, page 213. Linux Device Mapper Multipath Linux Device Mapper Multipath is installed and configured on each server in the cluster. Changes to configuration files To improve the performance of the HP 4400 Scalable NAS appliance, the changes described below were made to the /etc/opt/hpcfs/fc_pcitable and /etc/ rc.d/init.d/multipath.conf configuration files. IMPORTANT: If a node is restored or HBA drivers are changed, be sure to update the /etc/opt/ hpcfs/fc_pcitable and /etc/rc.d/init.d/multipath.conf files with these changes. 420 Initial configuration for HP 4400 Scalable NAS systems