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Users are able to access the application when they need it, with no disruptions.
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An application-centric organization gives precedence to preventing application downtime
over the prevention of the loss of data. Organizations can be data-centric for some
applications, but application-centric for others.
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High Availability + Continuous Operations = Continuous Availability.
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Operates 24 hours a day, seven days a week, without the need to stop applications
to accommodate maintenance tasks.
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Data is considered to be available if it is online and not corrupted, regardless
of whether the applications usually used to view and/or manipulate it are accessible.
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A data-centric organization gives precedence to preventing the loss of data over
the prevention of application downtime. Organizations can be data-centric for some
applications, but application-centric for others.
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The process of sending data off-site, where it can be protected from hardware failures,
theft and other threats. In most cases, the vaults will feature auxiliary power
supplies, powerful computers and manned security. Also referred to as a remote backup
service (RBS).
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A complete process of anticipating, planning for and having the ability to bring
business back to operations after an unplanned event. The disaster recovery planning
process would include understanding the continuum of business processes and the
potential points of failure within those processes, the ramifications of those points
of failure, and a solution to either mitigate that risk or bring that function back
to normal within the recovery time objective (RTO).
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Enterprise availability implies data, application and system availability at all
sites throughout the enterprise.
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The automatic switching of users from a failed primary system to an operational
backup system, without manual intervention. Depending on the nature of the problem
and the failover processes involved, users may or may not be aware that a failure
occurred. (See also “Switchover.”)
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Hardware and/or software with sufficient robustness, generally achieved through
redundancy, to mask any individual component failure so that operations can continue
even while a single component is out of service.
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Available to users almost 100 percent of the time. If a system goes down at a time
when users don't need it, that downtime is not considered to affect High Availability.
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When evaluating a proposed investment in a new project, the hurdle rate is the projected
rate of return that is required before the company will approve the project.
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A rational and disciplined methodology that encompasses an end-to-end view of a
computing environment – including applications, data, servers, operating systems,
processes and infrastructure – to guarantee consistent, predictable access to any
data or any applications wherever, whenever and however users require them.
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A term commonly used in marketing to denote not just the value of current purchases
made by a customer, but the net present value of all purchases that customer will
make now and in the future.
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Logical Partitioning. IBM term; more than one instance of an operating system on
a single CPU
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Mean Time Between Failure – a measure of the reliability of a hardware device or
component.
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Data that is updated on a database after the last backup was performed.
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Redundant Array of Independent Disks.
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Defines the point in a data stream to which you need to recover information.
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Defines how quickly you need to recover failed applications.
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Monitoring the iSeries User Journal(s) on the backup (remote) server as the basis
for replication, also referred to as RJ.
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The list of files and objects to be included in and/or excluded from replication.
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A user-definable setting for the minimum time before declaring a new recovery point.
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Site availability protects all systems and their dependent components at a given
site.
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Storage Area Network; hardware network dedicated exclusively to data storage devices.
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Service Level Agreements; typically used for external business partners to guarantee
a specific service level; becoming increasingly common for IT departments to guarantee
a minimum service level to business users.
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IBM i5 feature that minimizes journaling activity on the target server.
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The manual switching of users from one system to another. This might be done to
move users off a primary system in preparation for maintenance, move them back after
the maintenance has been completed, or to move users to a backup system when an
operator detects a failure on a primary system. (See also “Failover.”)
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An available system is one that has eliminated unplanned downtime caused by unexpected
equipment failures.
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Uninterruptible Power Supply. A large, sometimes massive backup power system based
on batteries.
Disaster Planning Basics: Checklist
Downtime Calculator: How Much Does Downtime Cost?
Glossary
Links to Other Resources
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