| Question |
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| What is this tool POWER HA6.1, What ar ethe uses of it ? |
| Answer |
| IBM PowerHA (formerly HACMP) is IBM’s solution for high availability clusters on AIX. |
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| Question |
| How many nodes we can add in power HA? |
| Answer |
| We can add upto 32 nodes in a cluster |
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| Question |
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| What are the heartbeat networks are available in powerHA ? |
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| Answer |
| IP based heartbeat network, Disk heartbeat, Serial (RS232) heartbeat |
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| Question |
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| Can you let us know the prerequisites for creating a cluster ? |
| Answer |
| Both node have tcp/ip connectivity to each other. Both nodes are physically connected to all disks configured in shared volume groups.Both node have same HACMP and RSCT version. Both nodes have a copy of the application that is to be highly available.The /etc/hosts file on both nodes is configured with a all IP label/address. start and stop scripts for the application server in both server |
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| What are the PowerHA editions available? |
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| PowerHA systemmirror standard and enterprise editions are available. |
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| Question |
| Can you tell something about the licensing. How many nodes we can add to the cluster with out license ? |
| Answer |
| PowerHA is IBM licensed product. License is required for installing PowerHA. It is paper license. |
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| Question |
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| How many sites can be added in power HA? |
| Answer |
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| We can configure two sites in PowerHA6.1 |
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| Question |
| Do we need to add any host entry in .rhosts file for configuring powerHA ? |
| Answer |
| No, PowerHA not using native remote execution so you do not need to configure .rhost |
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| How to take configuration backup in powerHA6.1 ? |
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| Answer |
| Using cluster snapshot we can take configuration backup. |
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| Question |
| Which are the applications will work with power HA 6.1? |
| Answer |
| PowerHA support most of the application like Oracle, DB2, Websphere etc.. |
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| Question |
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| In VIO environments ,all NIC resources are virtual and will show Link status as UP always. In this situation,how we can ensure proper switch over HACMP resources to Secondary node when Physical NIC cable got disconnected at primary node. |
| Answer |
| Add pingable IP in /usr/es/sbin/cluster/netmon.cf file in both servers. The destination IP should be use from outside of the physical box. |
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| Question |
| New features in powerha6.1 ? |
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| Answer |
| A new configuration wizard helps you quickly and easily configure a two site, two node cluster which uses GLVM for data replication between site. Full support for IPv6. Prior releases supported IPv6 only for Service IP and persistent addresses. PowerHA 6.1 enhances the HACMP support for DLPAR operations. |
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| Question |
| Can a file system mounted over NFS protocol be used for Disk Heartbeat? |
| Answer |
| No, NFS file system cannot be used for configuring the disk heartbeat.The should be connected to the server FC or iscsi protocol. |
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| Question |
| What are the log files used to diagnosis and troubleshooting cluster issue ? |
| Answer |
| /var/hacmp/adm/cluster.log file /var/hacmp/clcomd/clcomd.log file /var/hacmp/log/cspoc.log file /var/hacmp/log/hacmp.out /var/hacmp/log/hacmp.out /var/hacmp/log/clstrmgr.debug /var/hacmp/log/clstrmgr.debug From these log files we will get the error details. |
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| What are the AIX levels powerHA6.1 supported ? |
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| AIX V5.3 with TL9 or higher AIX V6.1 with TL2 SP1 or higher |
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| Question |
| What are the different method for installing hacmp packages? |
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| Directly from installation medium, From harddisk to which the software has been copied, From NIM server |
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| Question |
| Can multiple Service IP addresses be configured on single Ethernet cards? |
| Answer |
| Yes.it can be configured to have multiple Service IP addresses running on single ethernet card. |
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| What happens when a NIC having Service IP goes down? |
| Answer |
| When a NIC card running the Service IP address goes down, the HACMP detects the failure and fails over the service IP address to available standby NIC on same node or to another node in the cluster. |
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| Question |
| Which RSCT version is required for PowerHA? |
| Answer |
| AIX 5.3 RSCT 2.4.12.0 or higher AIX 6.1 RSCT 2.5.4.0 or higher |
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| IS there any need to have same major/minor number for SAN disks accros all cluster nodes ? if yes then what is the reason behind? |
| Answer |
| It is recommended to have same major number and for NFS-exported file systems you must have same major number on all nodes. |
