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HACMP High Availability

Introduction. ScopeHACMP ? Cluster Design HACMP ? Redundant ArchitectureHACMP ? Single Points of Failure (SPOF's)Preparing for HACMP ConfigurationHACMP Configuration. Scope. ScopeThis presentation covers HACMP standards, design and concepts in an example environment.This presentation

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HACMP High Availability

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    1. HACMP – High Availability Design and Configuration November, 2005

    2. Introduction Scope HACMP – Cluster Design HACMP – Redundant Architecture HACMP – Single Points of Failure (SPOF's) Preparing for HACMP Configuration HACMP Configuration

    3. Scope Scope This presentation covers HACMP standards, design and concepts in an example environment. This presentation is designed as a step by step procedure for the configuration of a 1-way cascading HACMP cluster running a database and application.

    4. 1-way Cascading Failover Two Node cluster, both nodes running One active node, one hot-standby node Both nodes running HACMP Active node is running database and application Second node is waiting to takeover application processing if necessary HACMP – Cluster Design

    5. HACMP – Hot-standby configuration

    6. Redundant network adapters on each node Gigabit ethernet adapter dedicated to database traffic Gigabit ethernet adapter dedicated to application traffic Gigabit ethernet standby adapter for failover of failed adapter Systems One active node One standby node Power Multiple connections to power source Disk Array Raid 10 level protection of data Application Multiple systems to provide business function HACMP – Redundant Architecture

    7. Example SPOF's Network switch (single network design) Switch failure will result in business function outage until switch is fixed or replaced Single storage communication adapter per node Adapter failure will cause node fail over with short outage to business function HACMP – Single Points of Failure

    8. Preparing for HACMP Configuration Identify cluster name and node names Identify boot IP address for database adapter Identify service IP address for database Identify boot IP address for application adapter Identify service IP address for application Identify standby IP address for standby adapter Create boot and service DNS names for database Create boot and service DNS names for application Create standby DNS name Create service DNS alias name for database Create service DNS alias name for application

    9. Preparing for HACMP Configuration (cont) Review database startup script /usr/local/scripts/whmpctt0_appl01_start.sh Review database shutdown script /usr/local/scripts/whmpctt0_appl01_stop.sh Review application startup script /usr/local/scripts/whmpctt0_appl02_start.sh Review application shutdown script /usr/local/scripts/whmpctt0_appl02_stop.sh

    10. Preparing for HACMP Configuration (cont) Download all latest fixes for the AIX operating system and HACMP via “suma” smitty suma Download All latest fixes Commit all applied updates of current system smitty commit Update the AIX operating system and HACMP with all downloaded updates smitty update_all Do not commit updates Save copy Accept all license agreements

    11. Preparing for HACMP Configuration (cont) Modify “/etc/hosts” on both nodes to contain IP Addresses Fully Qualified Domain Names (FQDN's) hostnames 172.19.30.17 ttc520-1a.mtxia.com ttc520-1a 172.19.30.33 ttc520-1b.mtxia.com ttc520-1b 172.19.30.1 ttc520-1a-boot.mtxia.com ttc520-1a-boot 172.19.30.2 ttc520-1b-boot.mtxia.com ttc520-1b-boot 172.19.30.3 ttc520-1c-boot.mtxia.com ttc520-1c-boot 172.19.30.4 ttc520-2a-boot.mtxia.com ttc520-2a-boot 172.19.30.5 ttc520-2b-boot.mtxia.com ttc520-2b-boot 172.19.30.6 ttc520-2c-boot.mtxia.com ttc520-2c-boot

    12. Preparing for HACMP Configuration (cont) Modify “/.rhosts” on both nodes to allow root access via service and boot hostnames (short names) service and boot Fully Qualified Domain Names (FQDN's) Boot IP addresses Service IP addresses ttc520-1a root ttc520-1a.mtxia.com root ttc520-1b root ttc520-1b.mtxia.com root 172.19.30.1 root 172.19.30.2 root ttc520-1a-boot root ttc520-1a-boot.mtxia.com root ttc520-1b-boot root ttc520-1b-boot.mtxia.com root 172.19.30.17 root 172.19.30.33 root ttc520-2a-boot root ttc520-2a-boot.mtxia.com root ttc520-2b-boot root ttc520-2b-boot.mtxia.com root 172.19.30.4 root 172.19.30.5 root

    13. Preparing for HACMP Configuration (cont) Modify “/etc/netsvc.conf”on both nodes to resolve in the following order Local Bind hosts = local, bind

    14. Preparing for HACMP Configuration (cont) Modify “/usr/es/sbin/cluster/etc/rhosts” on both nodes to contain the following service names for all resource groups in cluster boot names for both nodes in cluster ttc520-1a ttc520-1a-boot ttc520-1b ttc520-1b-boot ttc520-2a-boot ttc520-2b-boot

    15. Create cluster and identify participating nodes smitty hacmp Initialization and Standard Configuration Add Nodes to an HACMP Cluster Cluster name: ttc520-cl01 Node names: ttc520-1 ttc520-2 HACMP Configuration

    16. Create service IP labels smitty hacmp Initialization and Standard Configuration Configure Resources to Make Highly Available Add a Service IP/Label Address IP/Label Address: ttc520-1a Network Name: Press F4 and Select HACMP Configuration

    17. Synchronize the HACMP configuration to ensure correctness up to this point. smitty hacmp Extended Configuration Extended Verification and Synchronizatoin HACMP Configuration

    18. Create resource group for database and application volume groups smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resource Group Configuration Add a Resource Group Resource Group Name: whmpctt0 Participating Nodes: ttc520-1a ttc520-2a Startup Policy: Online on Home Node Only Fallover Policy: Fallover to Next Priority Node Fallback Policy: Fallback to Higher Priority Node HACMP Configuration

    19. Create resource group for the database service IP label smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resource Group Configuration Add a Resource Group Resource Group Name: whmpctta Participating Nodes: ttc520-1a ttc520-2a Startup Policy: Online on Home Node Only Fallover Policy: Fallover to Next Priority Node Fallback Policy: Fallback to Higher Priority Node HACMP Configuration

    20. Create resource group for the application service IP label smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resource Group Configuration Add a Resource Group Resource Group Name: whmpcttb Participating Nodes: ttc520-1a ttc520-2a Startup Policy: Online on Home Node Only Fallover Policy: Fallover to Next Priority Node Fallback Policy: Fallback to Higher Priority Node HACMP Configuration

    21. Configure the database and application resource group smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resource Group Configuration Change/Show Resources and Attributes... Select from list: whmpctt0 Volume Groups: whmpctt000vg HACMP Configuration

    22. Configure the database service IP label resource group smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resource Group Configuration Change/Show Resources and Attributes... Select from list: whmpctta Service IP Labels/Addresses: ttc520-1a HACMP Configuration

    23. Configure the application service IP label resource group smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resource Group Configuration Change/Show Resources and Attributes... Select from list: whmpcttb Service IP Labels/Addresses: ttc520-1b HACMP Configuration

    24. Arrange resource group activation in the following order whmpctt0 whmpctta whmpcttb This will start up the database and application then activate the database service label, and lastly, activate the application service label HACMP Configuration

    25. Synchronize the HACMP configuration to ensure correctness up to this point. smitty hacmp Extended Configuration Extended Verification and Synchronization HACMP Configuration

    26. Add an application server to startup and shutdown the database smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resources Configuration Configure HACMP Applications Configure HACMP Application Servers Add an Application Server Server Name: whmpctt0_appl01 Start Script: /usr/local/scripts/whmpctt0_appl01_start.sh Stop Script: /usr/local/scripts/whmpctt0_appl01_stop.sh HACMP Configuration

    27. Add an application server to startup and shutdown the application smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resources Configuration Configure HACMP Applications Configure HACMP Application Servers Add an Application Server Server Name: whmpctt0_appl02 Start Script: /usr/local/scripts/whmpctt0_appl02_start.sh Stop Script: /usr/local/scripts/whmpctt0_appl02_stop.sh HACMP Configuration

    28. Modify the database and interface application resource group to include the application servers smitty hacmp Extended Configuration Extended Resource Configuration HACMP Extended Resource Group Configuration Change/Show Resources and Attributes... Select from List: whmpctt0 Application Servers: whmpctt0_appl01 whmpctt0_appl02 HACMP Configuration

    29. Synchronize the HACMP configuration to ensure correctness up to this point. smitty hacmp Extended Configuration Extended Verification and Synchronization Automatically Correct Errors: Yes HACMP Configuration

    30. Start HACMP on both nodes, one node at a time, allowing the cluster to stabilize in between smitty hacmp System Management Manage HACMP Services Start Cluster Services Start now, on system restart, or both: now Start Cluster services on these nodes: ttc520-1a Broadcast message at startup: True Startup cluster information daemon: True Reacquire resources after forced down: False Ignore verification errors: False Automatically correct errors...: Interactively HACMP Configuration

    31. Start HACMP on both nodes, one node at a time, allowing the cluster to stabilize in between smitty hacmp System Management Manage HACMP Services Start Cluster Services Start now, on system restart, or both: now Start Cluster services on these nodes: ttc520-2a Broadcast message at startup: True Startup cluster information daemon: True Reacquire resources after forced down: False Ignore verification errors: False Automatically correct errors...: Interactively HACMP Configuration

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