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Going Back in Time: A New Approach to AIX HA and DR

High Availability / Disaster Recovery
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A comprehensive HA/DR environment includes the ability to "go back in time" using snapshots and continuous data protection.

 

The term "high availability" can be confusing in the IBM Power Systems realm because the definition of the term is different in the IBM i and AIX worlds. In IBM i shops, HA is achieved by setting up a backup system and using an HA product to replicate applications, along with business and system data, from the production server to the backup in real-time or near real-time. The result is a hot-standby backup server that is fully ready to take over operations at any time.

 

This contrasts with AIX environments, where HA usually refers to a clustered configuration in which two or more nodes in the cluster share a common data store. In this environment, a secondary node can take over operations if the primary node fails or needs to be taken offline for maintenance; however, the configuration does not inherently shield operations from a failure of the shared data store.

 

Typically, the data store is protected using technologies such as RAID or hardware-based disk mirroring. But because these forms of data redundancy typically operate only locally, this does nothing to protect data from destruction due to a disaster. Consequently, companies that want to provide a higher standard of availability augment traditional AIX HA with data replication.

 

Optimal availability can be achieved by replicating data to a system that is sufficiently distant from the production server such that a disaster is unlikely to affect both servers. Then, when a disaster strikes, users can be switched to this backup system, without the need for lengthy recovery operations.

 

An article that was published here about a year ago, "AIX Clustering Versus Replication: Why Settle for Just One?", examined this coupling of traditional AIX clustered HA with replication. Please see that article for a more detailed discussion of the topic.

 

The definition of "disaster recovery" is usually identical in AIX and IBM i shops. In both cases, DR traditionally refers to the backing up of data to tapes. This is typically done nightly. Then, in the event of a disaster, data and applications can be recovered from the tapes.

 

Tape-based recovery of a large data center can be a lengthy, labor-intensive, error-prone process. Furthermore, it risks the loss of data that has been added or updated after the backup tapes were created during the previous night because that data will not yet have been backed up. As a result of these issues, some companies have moved to disk-based DR alternatives, such as backing up data to disk, rather than to tape, or continuously replicating data to disks at a remote location. Nevertheless, many companies still use tape-based backups as their only DR technology.

 

Even ignoring the problems of tape-based backups mentioned in the preceding paragraph, traditional HA and DR technologies do not offer a complete solution. Both technologies allow recovery to only a very limited number of points in time. In the case of HA, recovery can be performed to only the point of failure. In the case of DR, the only available recovery points are the times when the currently existing backup tapes were created.

 

Also, because it takes a long time to load data from tape, backup tapes are typically used only for disaster recovery or, possibly, for restoring data items after they've been corrupted or accidentally deleted. Thus, because they normally don't serve any purposes other than DR, tape-based backups are usually considered to offer only insurance against a disaster. Consequently, they often provide little or no value unless and until a disaster strikes.

 

An HA configuration that incorporates replication offers an advantage in this regard. Read-only operations, such as query and reporting functions and tape-based backup tasks, can be performed on the replica server, eliminating these loads from the production server and data store. However, because the replica must always be in perfect synch with the production database, the replica normally cannot be used for read/write tasks.

Snapshots Deliver HA/DR ROI

An HA solution goes beyond a mere insurance policy because it protects against downtime from not only rare, unforeseeable events such as disasters, but also from events that are guaranteed to happen regularly—namely, scheduled maintenance. Nonetheless, an HA/DR solution can deliver even greater value by incorporating an additional capability: snapshotting.

 

There are two generic types of snapshots: traditional and virtual. A traditional snapshot copies the full production data store, or a predefined segment of it, and stores that data, often in a flat file. Using the snapshot in an online application is often difficult. Generally, the snapshot has to be loaded into a database before employing the data for that purpose.

 

A virtual snapshot technology is much more flexible and useful than a traditional snapshot. It creates a virtual, yet fully functional read/write copy of data at a point in time.

 

To be effective and efficient, a snapshot facility must augment an HA solution, rather than replace it. This is essential because taking snapshots on the production server can severely impact the performance of operational applications. In contrast, when using an HA solution that includes replication to maintain a real-time or near real-time data replica on a backup server, snapshots can be created using the replica data, thereby eliminating any impact on the production systems.

 

It is important to note that snapshots are independent of the HA replica data store. Consequently, after it has been created, a snapshot can be used for any purpose, including read/write operations, without fear of damaging the hot-standby replica database that is required for HA purposes. No matter what happens to the snapshot, the backup server will still be ready to take over operations if necessary.

 

These features allow virtual snapshots to be employed to serve a wide variety of productive business purposes, including the following:

  • Snapshots are commonly used to offload tape backup operations in order to eliminate the backup-processing load from the production server. This eliminates the need for a backup window during which some or all applications must be shut down or curtailed. In addition, the snapshot can be created at a clean recovery point, thereby reducing the likelihood of data corruption or referential integrity issues during recovery options. Furthermore, because the tape backups are created on the recovery system, there is no need to transport tapes offsite for protection, provided that the recovery system is sufficiently distant from the production system.
  • Snapshots can also be used for reporting, business intelligence, and data mining purposes. Because these tasks, in particular business intelligence and data mining, can be very resource intensive, using snapshots to offload that processing to the recovery system can significantly improve production application performance.

    In addition, there are times when reports are required to show the state of the business as of a particular point in time. Quarter-end and year-end reporting are good examples of this. Because snapshots can provide a frozen view of data, they provide a simple way to produce these reports while the business continues to operate normally.
  • It is impossible to know for certain whether you are fully prepared to recover from a disaster until you test your recovery processes, resources, and data. That testing can be a problem when using a traditional DR or HA solution. Loading tape-based backups onto a backup server to test that they are useable for recovery purposes is a lengthy, cumbersome, labor-intensive process. As a result, disaster recovery readiness is rarely tested in these environments.

    When you use a remote, replicated HA server as your disaster recovery solution, recovery testing is simpler but risky. Testing is easy because the secondary server is a ready-to-run backup of the primary server. To test its readiness, you can simply perform a role-swap. What was the backup server then takes over the production role. If it's not ready to take on that role, the failure will quickly become apparent.

    However, the danger in this testing strategy is obvious. There's no point in testing something if you are 100 percent certain it's going to work. If a test of this nature fails, production operations may stop until users can be switched back to the functioning primary server.

    Simply using the backup server as a test environment without switching production operations to that server isn't practical because the testing process must perform updates on the backup database to ensure that it is fully useable. Thus, after the test is finished, the backup data will no longer be synchronized with the production server.

    A snapshot can provide the answer to this testing dilemma. Because the snapshot is independent of the replica data store, you can perform non-intrusive disaster-recovery readiness testing against the snapshot. Then, when you are finished testing, the snapshot can be discarded. And, because the snapshot is a point-in-time replica of the backup data store, it provides an accurate test of recovery readiness.
  • Snapshots also provide an easy way to quickly create test environments for developers. Because the snapshot is a copy of the production data store, it ensures that tests are performed on real-world data, without threatening the integrity of the production or backup data stores.
  • Likewise, a snapshot can be used as an isolated "sandbox" training system for new employees. This can minimize employee ramp-up time and ensure that practice activities—and mistakes—do not impact production operations.

When evaluating snapshot options, look for one that incorporates Copy-On-Write technology. This technology incurs very low disk-use overhead, typically on the order of a few percent of the protected data set's size. Consequently, snapshots created using this technology typically consume considerably less space than, for example, full disk mirrors.

Continuous Data Protection Completes the HA/DR Picture

Adding one more technology, Continuous Data Protection (CDP), to the HA/DR mix creates an exceptionally highly available, completely recoverable data infrastructure.

 

The problem with traditional DR or even HA solutions is that they offer only "point-in-time" recovery options. In the case of tape-based DR solutions, those points in time are when the backup tapes are created, typically nightly. Consequently, the tapes alone can't help you if you need to recover data to its state at some point in the middle of the day.

 

In the case of traditional HA, the only possible recovery point is "right now." Because the HA product maintains a real-time replica of production data, if some data is corrupted or accidentally deleted on the production database, that corruption or deletion will likely be immediately replicated to the backup data store. Thus, the backup will not offer a way to repair the damage.

 

This point-in-time limitation of traditional DR and HA offerings is a serious problem because one of the most commonly required recovery tasks is to restore data that was corrupted or is accidentally deleted. This can happen at any time of the day and may result from an operator error, a computer virus, malicious activities of disgruntled employees, or many other circumstances. CDP provides a way to recover from these events.

 

The CDP technology monitors file activity on the production system. It then captures every write operation and stores those writes individually into logs that can be used to, in effect, undo and redo data activity.

 

Vendors offer two flavors of CDP: near CDP and true CDP. With near CDP, data writes are not continuously transmitted to the CDP logs. Instead, they are batched and transmitted periodically, possibly during system or network slow periods or after a file is closed. The disadvantage of near CDP is that recovery points may be infrequent and there is no way to recover data to its state at a point in time between those recovery points.

 

True CDP, on the other hand, transmits writes to the CDP logs continuously, meaning that data can be recovered to any point in time. Because the CDP logs are disk-based and because the CDP tool can automate the recovery processes, recovery from disasters, data corruptions, and accidental data deletions can be performed rapidly, completely, and with little chance of human error.

 

Thus, in the common HA/DR lingo, an HA/DR solution that includes CDP can meet the most stringent of recovery time objectives (RTOs) and recovery point objectives (RPOs).

Full-Spectrum HA/DR

As stated above, what are labeled as HA solutions in AIX environments solve only a limited range of problems. They can keep operations going if the primary server has to be taken offline for maintenance, such as to upgrade the hardware, operating system, or application software. However, because the clustered nodes in an AIX HA configuration share a common data store, this solution does not, in itself, protect against data destruction or operational downtime due to a disaster. And if that shared data store needs to be taken offline for any reason, applications running in the cluster will stop as well.

 

Furthermore, this environment serves only as an HA platform. It does nothing to support secondary purposes, such as generating isolated environments that can be used for creating tape-based backups, testing, or performing offline query and reporting functions.

 

Adding replication to the mix protects the production data store by maintaining a ready-to-run backup server complete with its own up-to-the-moment copy of production data. If this backup system is sufficiently remote from the production server, it also serves to protect against data destruction and downtime due to disasters.

 

By augmenting this with a snapshot facility, you can increase the return on your investment by making it possible to quickly and easily create copies of production data that can be used for additional purposes without any impact on either the production or backup data stores.

 

Finally, adding CDP creates a full-spectrum HA/DR solution that protects against all eventualities, while also allowing you to fully leverage the value inherent in your enterprise data.

Rich Krause

Rich Krause, a Senior Product Marketing Manager at Vision Solutions, specializes in bringing emerging technologies to market. Rich has more than 20 years of experience in product marketing, product management, and product development in the enterprise software marketplace. Prior to joining Vision Solutions, Rich was Director of Technical Services for Clear Communications, a leading provider of network management software applications.

 

Rich is a frequent speaker and author on topics relating to disaster recovery and data protection in open systems and IBM Power Systems environments. Contact Rich at Richard.Krause@visionsolutions.com.

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    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.