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The Benefits of Data Replication in HACMP/PowerHA Cluster Management Implementations W H I T E PA P E R Executive Summary In today's fast-paced world, businesses both large and small face increasing internal and external demands for data protection and efficient, uninterrupted operations. Even a brief interruption in services and processes can have potentially disastrous results that businesses cannot afford to risk. IT departments are being tasked with accommodating these requirements while
  The Benefts o Data Replicationin HACMP/PowerHA ClusterManagement Implementations    W H I T E P A P E Rv i s i o n s o l u t i o n s . c o m 1 Executive Summary In today's ast-paced world, businesses both large and small ace increasing internal  and external demands or data protection and efcient, uninterrupted operations. Even a brie interruption in services and processes can have potentially disastrous results that businesses cannot aord to risk. IT departments are being tasked with accommodatingthese requirements while also being expected to do more with less in a diminishingeconomy.Fortunately, technological advances in AIX high availability, clustering disaster recovery, and continuous operations have continually risen to meet these challenges, ensuring that both planned outages due to maintenance and upgrades and unplanned outages due toenvironmental conditions, operator error, or sotware bugs result in minimal data loss.The HACMP high availability solution that clusters multiple servers to shared storageoers automatic recovery o applications and system resources i a ailure occurs with the primary server, thereby maintaining the highest levels o data currency in that scenario.Nonetheless, clustering is only part o the equation o a truly resilient IT inrastructure because should the shared storage become damaged or otherwise unusable, signifcantdisruption o business critical applications will still occur. That is why the other essential component o a truly resilient AIX environment is data replication technology which protectsthe database by maintaining a storage clone in an osite location. This way both servers are redundant and storage is redundant. Still, not all replication solutions are alike.  W H I T E P A P E Rv i s i o n s o l u t i o n s . c o m 2 Ensuring Protection or the Server With the advent o globalization and o business demand or increased service-levelagreements (SLAs) that require the highest level o availability o business-critical servicesand servers, high availability solutions became critical components in inormationsystems—not just or large enterprises, but also or medium-sized and small businessesthat, in many ways, are even more vulnerable to system outages. While a larger enterprisemay have the human, technical, and nancial resources to cope with and survive anunplanned outage, smaller businesses that lack similar resources can easily be put out o business i a core IT unction becomes unavailable even or a short period o time.High availability, also sometimes reerred to as ault resilience, reers to technology withwhich servers and business services can achieve availability characteristics in the range o 99.99%–99.999%. High availability systems should be designed or businesses that canendure short periods o downtime; in contrast, ault tolerant systems are designed to achievevirtually continuous operation, albeit that level o availability requires ully redundant hardwareand sotware components, resulting in higher solution cost.High availability or the AIX operating system is accomplished by cost-eciently utilizingredundant hardware and sotware components as well as clustering sotware that managesthe system and is responsible or monitoring system health and perorming the necessaryrecovery actions should a ailure occur.Since there is typically sucient system capacity available to temporarily host services—either readily or via AIX’s Capacity on Demand acility—high availability clustering willimprove service availability not only during unplanned events, but also during scheduledmaintenance. As high availability clustering products enable the administrator to handlesystem resources in groups, they can signicantly improve system administration andchange management practices, thereby contributing high levels o achievable service-levelagreements and reducing administration labor expenses.In order to provide high availability or AIX servers on the System p/AIX platorm, IBM’s highavailability solution or AIX, High Availability Cluster Multi-Processing (or HACMP, now calledPowerHA) has traditionally been utilized. HACMP, in its base oering, is a high availabilitysolution that provides capabilities to assist with monitoring the cluster, automaticallyrecovering applications and system resources i a ailure occurs, and easing system andcluster administration and maintenance via its Single System Image–like capabilities.HACMP provides a very mature, robust, and eature-rich environment or high availability,with built-in capabilities to support 32 nodes, complex multi-tier business applicationenvironments, and AIX’s superior virtualization eatures. It provides protection or networkresources, applications, logical volume manager (LVM) resources, and other resources thatmay be less commonly used but are equally important or certain environments. HACMP’sbase oering is typically used in a shared-disk environment; protection against disk or diskarray ailure typically has to be achieved by disk mirroring technologies (RAID solutions, LVMmirroring, etc). A typical local HACMP cluster is depicted in the ollowing diagram:  W H I T E P A P E Rv i s i o n s o l u t i o n s . c o m 3  High availability in the realm o a local data center was, or many years, the typical businesscontinuity solution or AIX environments. While there were solutions available or AIX thataddressed the need or disaster recovery (another major component o business continuity),those solutions were expensive, challenging to install, and dicult to administer. The recent decade, however, witnessed a surge in interest or proper disaster recoverypractices and solutions driven by large, as well as SMB-type, businesses. This is because,or any size company, a ailure o a data center, be it an unexpected power outage, ascheduled site maintenance project, or an environmental disaster, must not jeopardizeservice-level agreements; must not place unacceptable risk on those businesses’ abilityto continue serving their global market; and must not risk their ability to satisy stringentregulatory compliance requirements such as HIPAA, Sarbanes-Oxley, or Basel II, or othercountry-specic regulations.It is important to mention the third and nal, yet equally important, component o businesscontinuity: continuous operations. Any high availability and disaster recovery solution has tobe relatively easy to use or the current IT sta and should introduce the least disruption toexisting IT processes; otherwise, the solution itsel may become the source o disruptions tobusiness. Considerations or Disaster Recovery Solutions In order to satisy the emerging business need or disaster recovery or AIX environmentsand servers, solutions targeted toward disaster recovery needs have been introducedand have gained wider acceptance over the last decade. HACMP’s disaster recoveryamily o products, branded as HACMP/XD, provides various options or disaster recovery. HeartbeatMonitorEthernet (IP)Network LAN SharedData Store AIXNode AIXNode
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