OpenVMS Cluster Systems - OpenVMS Systems - HP

Cluster Storage Devices
6.1 Data File Sharing
Figure 6–2 Dual-Pathed Disks
Disks
Server Nodes
Client
Nodes
6–4 Cluster Storage Devices
SCSI
CPU CPU
LAN
VM-0672A-AI
Dual-pathed disks or tapes can be failed over between two computers that serve
the devices to the cluster, provided that:
• The same device controller letter is generated and the same allocation class
is specified on each computer, with the result that the device has the same
name on both systems. (Section 6.2.1 describes allocation classes.)
• Both computers are running the MSCP server for disks, the TMSCP server
for tapes, or both.
Caution: Failure to observe these requirements can endanger data integrity.
You can set up HSC or HSJ storage devices to be dual ported between two storage
subsystems, as shown in Figure 6–3.