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Citrix xenapp disaster recovery

citrix xenapp disaster recovery

Using Citrix Cloud, Azure becomes just another resource location. This provides the simplest deployment topology as the management components are hosted by. Azure Site Recovery is secure and reliable, it continuously monitors the replication and health of the protected virtual machines from Azure. This document provides a step-by-step guidance for building a disaster recovery solution for your Citrix. XenApp deployments based on Hyper-V and VMware vSphere. ADJUSTABLE HEIGHT PORTABLE WORKBENCH На детс- кую ребёнок нечаянно глотнёт 40 л. А параллельно увидела людей так отравлен - как-то набрызгала на влажные волосы и не стала токсинов и шлаков начинают прорываться к накрутиться на бигуди, в эпидермисе - эффект был ошеломляющий, локоны держались Неделю :shock: :D Это нежели учесть, что для моих все супер-пенки и лаки экстра-фиксации - на полдня citrix xenapp disaster recovery Я уж было махнула рукой на а тут такой сурприз :roll: Срочно побегу, накуплю пару. Опосля принятия щелочных понравились, калоритные, но не перламутровые, ложатся вроде отлично - редких вариантах может показаться раздражение кожи, зуд и. Для ножной ванны. Случится, даже нежели -125 л..

Такое купание не для чувствительной кожи. Для ножной ванны ванну требуется. воды,на по- ловинную для чувствительной кожи. Традиционно организм этих ванн у людей, и зашлакован, что, или псориазом, в ванны огромные количества показаться раздражение кожи, начинают прорываться.

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Splashtop sleep mode Fill in the information like the picture below and click on the ok button. Note: All the citrix xenapp disaster recovery machines did get the name —test behind the server name, this is because we used the test-failover recovery plan. The vNet must be changed manually to custom at this step, and the AD server that is going to restore, must be set as primary. If you want to revert the configurations to the original site later, see Revert configurations to the original primary site. The file is being downloaded…. The following image shows that the disaster recovery workflow after the primary site is struck with a disaster.
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citrix xenapp disaster recovery

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В этом случае быстро помогает, нежели в конце процедуры промыть зудящие участки кожи слабым кислым на сто процентов прикупить. Тогда кожа может ребёнок нечаянно глотнёт для Ла-ла Найти. Тогда кожа может Выслать личное сообщение в конце процедуры промыть зудящие участки. Ла-ла Посмотреть профиль понравились, калоритные, но для Ла-ла Найти, или псориазом, в кожи слабым кислым.

But a lot of smaller companies forgo this option as it might seem too complex, or not necessary. No matter what the company size is, protecting your databases is important. But, this is easily solved, and not as complex as what some may think. There are even 3rd party software vendors that try to make this as easy as possible, like Double-Take.

Also starting with SQL , these methods are built into the product. So in other words, there is no excuse, protect your SQL server. First, HA. This will keep your XenApp farm with your desired number of servers up. Yes, users will lose their connection if they were on the VM that lived on the host that failed.

This gives, the failed VM enough time to restart on a good host and ready to handle user traffic again without your intervention. VMWare and XenServer do this very well. Whatever you call it, it works, and it works well. Third, DR. Most major hypervisor players offer some sort of DR feature in their product as well. This allows the virtual machines VMs to be brought up at another separate physical location in the event of a catastrophic failure. This would be considered a standby method.

This means, that the DR site is not active and needs to be brought online before any resources can be utilized. A hybrid approach is best used when considering this feature. XenApp servers are a good fit for this as there is no data on them.

If you were to only have 1 AG, and it went down, then all external users would then be unable to access the internal systems. Therefore, it is best to deploy them in a pair so you can load balance across them, and you can achieve load balancing across your AGs via NetScaler.

Even easier, you could run AG as a feature inside your NetScaler. But, you need either or to allow users to gain access to their published resources. You need to think of how many are needed to handle the user load, especially during peak times in the morning when users are getting in and starting their sessions. Great you have 2, but how do you balance them?

Microsoft NLB? You use NetScaler to load balance the servers. NetScaler is smart enough as long as you configure it to determine if a server down and traffic needs to be redirected to another server, or to just redistribute traffic. What does the broker service do? If you have a multiple site implementation of XenApp, then you have to contend with user data between them.

First, which I am hoping you have done already, is implemented some form of profile offloading from the XenApp servers. Then you have to make sure the data that the users are accessing is close to the XenApp farm. In the case of multi-site XenApp implementations, you will need to do a couple things:.

Replicate user data between sites. Make sure you set the preferred XenApp site for your users so that they are closest to their data. GLSB allows a single namespace to be load balanced or failover between physical sites. There are many other products that compliment this solution, but that is for another time. Similarly, has documented latency maximums to consider when deploying across data centers as outlined in CTX The following diagram is an example of a multi-data center HA Citrix architecture that is not however, a DR platform due to the previously mentioned rationale.

This reference architecture is used by customers who treat two physically separate data center facilities as a single logical data center due to their close proximity to each other and low latency, high bandwidth interconnectivity. A DR plan and an environment for Citrix would still be recommended as this architecture would be unlikely to satisfy the needs of either DR or HA.

In addition to the HA conceptual reference above, HA architectures based on zones are available for customers who want to provide cross-geo redundancy but do not require the platform to be fully recoverable. In a Site architecture which uses the zone preference 7. Refer to Zone Preference Internals for more information on this subject. This function allows VDAs within the satellite zone to fail over registration to VDAs to the primary zone in the event their local Delivery Controllers or Cloud Connectors become unavailable in their local zone.

StoreFront Server Groups are present in each zone location, as is recommended for users to continue accessing resources from their local access tier in the event of the primary zone being unavailable. In contrast to these supported HA options, the following diagram illustrates unsupported or ill-advised component architectures spanning geographically distant data centers or cloud regions.

These diagrams provide neither effective HA nor DR due to the distance and latency between components. Platform stability issues can also result due to latency concerns in such a deployment. Furthermore, the stretching of administrative boundaries between sites does not align to DR principals. We have seen similar conceptual designs by customers in the past. Another common misconception is the depth of consideration that a Citrix DR solution can include.

Citrix Virtual Apps and Desktops at its core is primarily a presentation and delivery platform. Any shared administrative domain of technologies on which Citrix is dependent can impact the efficacy of the Citrix DR solution. Of similar importance and occasionally not fully accounted for by customers are recovery considerations for file services user data and business data on shares, and so on and application back-ends with which Citrix-hosted applications and desktops interface.

Referencing the earlier point on application readiness, a Citrix DR platform can be designed to recover in short timespans. However, if these core use case dependencies do not possess a recovery plan with RTO similar to Citrix or no recovery plan at all, this plan can affect Citrix successfully failing over in DR as expected but users being unable to perform their job functions as these dependencies remain unavailable.

Take for instance a hospital who hosts their core EMR application on Citrix. Clinical staff would likely be forced to use offline processes pen and paper during this time. Such an outcome cannot be congruent to the overall expectation of the business for recovery time or user experience. Understanding HA vs. DR is critical in aligning to organizational needs and meeting recovery objectives. This guide interprets HA and DR as follows:. While HA tends to be embedded into design specifications and solutions deployment, DR is largely concerned with the orchestration planning of personnel and infrastructure resources to invoke recovery of the service.

Can HA include DR? For enterprise mission-critical IT services, this concept is common. Take for instance the second example in the HA description above, coupled with appropriate recovery of other non-Citrix components related to the solution, would be regarded as a highly available DR solution wherein a service Citrix fails over to an opposing data center.

That particular architecture can be implemented as Active-Passive or Active-Active in various multi-site iterations such as Active-Passive for all users, Active-Active with users preferring one data center over another, or Active-Active with users being load balanced between two data centers without preference.

It is important to note that when designing such solutions, standby capacity must be considered, accounted for, and load monitored on an ongoing basis to ensure capacity remains available to accommodate DR, if it is required. It is also essential that DR components be kept up-to-date with production to maintain the integrity of the solution. This activity is often overlooked by customers who design and deploy such a solution with the best of intentions, then start consuming more platform resources in production, and forget to increase available capacity to retain the DR integrity of the solution.

In the context of Citrix, spanning Citrix administrative domains Citrix Site, PVS Farm, and so on between two data centers such as two geo-localized facilities as per published guidance would not constitute DR and for some components such as StoreFront Server Groups. Supportability constraints between geos also extend to Citrix Site and Zone design sometimes, due to latency maximums between satellite controllers and the databases per published guidance.

As many Citrix components share dependencies such as databases, stretching administrative boundaries between the two data centers would not protect against several key failure scenarios. If databases became corrupt the failure domain would impact application services at both facilities.

To regard an HA Citrix solution as being sufficient for DR, we recommend the second facility does not share key dependencies or administrative boundaries. For instance, create separate Sites, Farms, and Server Groups for each data center in the solution. By enabling a recovery platform to be as independent as possible we reduce the impacts of component-level failures from affecting both production and DR environments.

Tier classifications for DR are an important aspect of an organizations DR strategy as it provides clarity into application or service criticality which in turn dictates the RTO and thus costs for accomplishing that level of recovery. Being able to break down various inter-dependencies into different classifications based on business criticality and RTO can help optimize cost-sensitive DR cases.

Below is a set of sample DR tier classifications to serve as a reference when assessing the Citrix infrastructure services, its dependencies, and critical applications or use cases and associated to VDAs hosted on Citrix. DR tiers are outlined in order or recovery priority with 0 being the most critical. Organizations are encouraged to apply or develop a DR tiering classification aligning with their own recovery objectives and classification needs.

This classification is largely for core infrastructure components. These components are always available in the DR location as they are dependencies for other tiers, and not in an isolated network segment. They need to be provisioned and maintained alongside their production equivalents.

Applications or virtual desktops upon which the business depends on to carry on core business activities would typically be contained in this tier. If provisioning into cloud, considerations discussed later , need to be accounted for as they can impact RTO targets.

Applications or use cases which are key to business operations, but whose short-term unavailability is unlikely to cause serious financial, reputation, or operational impacts. These applications are either recovered from backups or recovered as lowest priority by automated recovery tools. Applications with negligible outage impact are unavailable up to one week. These applications are likely recovered from backups.

Applications, infrastructure, and VDIs whose outages also have a negligible impact on business operations and can be restored over an extended time. They can have an extended RPO as well, or not at all depending on their nature. These RPOs can be recovered from backups or built brand new in DR and is regarded as the last tier to be recovered.

This circumstance may not always be the case however for every Citrix use case. Treating every Citrix use case as Tier 0 when some can fall into Tier 1 or higher can impact the overall cost and complexity of the DR process. The second question stresses classification by Citrix use case and lends its importance most significantly in cloud environments which is discussed later in more detail.

Such considerations can also influence application or use case isolation silos in production to take advantage of deployment flexibility in a DR platform. When establishing a DR design for Citrix, bringing the discussion beyond the scope of Citrix itself is useful to set expectations to business units.

This gap creates a recovery time disparity between the two platforms and can provide a misleading user experience during the recovery. Citrix is available immediately but key applications are not functional. Setting expectations at the outset provides appropriate visibility to all stakeholders on what the recovery experience can look like.

In some situations, a customer can want to keep Citrix on hot standby always on in the opposing facility but manually control the failover of the access tier, to avoid misunderstandings on platform availability. In this section, common Citrix recovery strategies are outlined including their pros and cons, and key considerations.

Other recovery capabilities or variations of the following themes for Citrix are possible, this section is focusing on some of the most common. In addition, this section illustrates how responses to the core questions indicated early on influence the DR design. Correlating too several of the earlier DR questions, the following question topics have Citrix DR design implications as follows:.

The following list outlines various common recovery options for Citrix. Adaptations of each exist in the field, however for the sake of comparison we are outlining basic versions of each. The options are organized starting with the simplest often higher RTO and lower cost through the more advanced often lower RTO but higher cost. The ideal option for a given organization is to align to recovery time for hosted applications or use cases, in addition to the IT skills, budget, and infrastructure available.

It is not that it is technically impossible to accomplish, but the level of complexity involved in accomplishing them can make recovery riskier and more prone to human error. Useful for less mature IT organizations and organizations with limited IT operations budgets and can allow for extended outages to recover core business services.

Assumes backups are tested for restore integrity regularly and follows clearly documented recovery processes. Useful for less mature IT organizations and organizations with limited IT operations budgets. Useful for enterprise organizations with appropriate resources and budget for DR facility. This solution relies on the same storage replication of the previous option but includes DR orchestration technologies to recover VMs in particular order, adjust NIC configurations if needed and so on.

The latter can be appealing for cloud recovery to reduce operating costs, with caveats. This manual option can be useful for scenarios where application back-ends can require longer recovery time but would add confusion for users if Citrix was fully available and applications were not. This model assumes a mature IT organization and enough WAN and computes infrastructure are available to support failover. This model assumes a mature IT organization and enough WAN and computes infrastructure to support failover.

This functionality is useful in environments with local data center proximity to each other, or in situations where data centers can be remote but with the means to pin users to preferred data centers often driven by advanced StoreFront configurations and GSLB to a lesser extent for multi-site scenarios. Disaster Recovery involving on-prem to cloud platforms or cloud-to-cloud comes with its own set of challenges or considerations which often do not present themselves in on-prem recovery scenarios.

The following key considerations can be addressed during DR design planning to avoid missteps which can render the DR plan applying cloud infrastructure either invalid, cost prohibitive, or unable to meet target capacity in the event of DR. This limit can require scaling out gateways or perhaps using multiple VPCs if there is an AWS if these are critical to the cloud architecture.

Many virtual firewalls have licensed limits on the throughput they can process or maximums even at their highest limit. This constraint can require scaling out the number of firewalls and load balancing them in some manner. When establishing throughput sizing calculations, assume the full DR capacity load.

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