Configuring and Verifying Communication Across a Disk Heartbeat Network in HACMP 5.1

Technote (FAQ)

Question

Configuring and Verifying Communication Across a Disk Heartbeat Network in HACMP 5.1

Answer

Configuring a disk heartbeat network in HACMP 5.1

Verifying communication across a disk heartbeat network

---

1.     Ensure that the disks to be used for disk heartbeating are assigned and configured to each cluster node. Enter:

  lspv -> ensure that a PVID is assigned to the disk on each cluster node

If a PVID is not assigned, run one of the following commands:

chdev -l hdisk# -a pv=yes

OR

chdev -l vpath# -a pv=yes (if SDD is installed)

2.     Create an enhanced concurrent mode volume group on the disk or disks in question using SMIT. Enter:

 smitty hacmp

Select:
System Management (C-SPOC)
HACMP Concurrent
Logical Volume Management
Concurrent Volume Groups
Create a Concurrent Volume Group (with Datapath Devices, if applicable)

Press F7 to select each cluster node. Select the PVID of the disk to be added to the Volume Group. Enter the Volume Group Name, Desired Physical Partition Size, and major number. Enhanced Concurrent Mode should be set to True.

3.     Create a diskhb network. Enter:

 smitty hacmp

Select:
Extended Configuration
Extended Topology
Configuration
Configure HACMP Networks
Add a Network to the HACMP cluster

Choose diskhb. Enter the network name or accept the default.

4.     Add each disk-node pair to the diskhb network. Enter:

 smitty hacmp

Select:
Extended Configuration
Extended Topology
Configuration
Configure HACMP Communication
Interfaces/Devices
Add Communication Interfaces/Devices
Add Pre-Defined Communication Interfaces and Devices
Communication Devices

Choose your diskhb Network Name. For Devices Name, enter a unique name; For device path, enter /dev/vpath# or /dev/hdisk#; For nodename, enter the node on which this device resides.

Repeat step 4 for every node in the cluster.

---

1.     Run the following command on the first node to put it in Receive Mode:

  /usr/sbin/rsct/bin/dhb_read -p hdisk# -r  (replace hdisk# with rvpath# if using SDD)

The following should be displayed:

  Receive Mode:

  Waiting for Response . . .

2.     Run the following command on a different node to put it in Transmit Mode:

 /usr/sbin/rsct/bin/dhb_read -p hdisk# -t   (replace hdisk# with rvpath# if using SDD)

If communication is successful, the following should be displayed:

  Link operating normally.