VM HA vs Application HA

VM HA vs Application HA

Virtual Machine HA (VM HA) implements high availability at the hypervisor level by replicating and restarting full virtual machines, while Application HA implements high availability at the application level by replicating only application data and restarting the application. The two solutions do not offer the same level of high availability as explained in this article.

Application HA with SafeKit

SafeKit offers a complete solution for application HA that solves hardware failures (20% of problems) including the complete failure of a computer room, software failures (40% of problems) including smooth upgrade server by server and human errors (40% of problems) thanks to its simplicity.

Although there is an integration per application (restart scripts), the integration is simple and is made through application modules. Many examples of HA modules are given here.

VM HA with SafeKit

VM HA solves only problems of hardware failures (20% of problems).

SafeKit offers a simple and economical solution to build virtual machines high availability on Hyper-V with

The architecture does not require a shared disk or a replicated SAN if the two servers are in two remote computer rooms.

VM HA vs Application HA

VM HA with the SafeKit Hyper-V moduleApplication HA with SafeKit application modules
Application HA
Replicates too much data (App+OS)Replicates only application data
Reboot of VM on hypervisor crash (unknown recovery time if the reboot requires manual operation)Quick recovery time with restart of App on OS2 if crash of VM1
No application checker and software failoverApplication checker and software failover
Risk of downtime when fixing OS or App (single image)Smooth upgrade of OS1 or OS2 or App (two images)
Generic solution for any application / OSIntegration per application

SafeKit vs Microsoft Hyper-V Cluster & VMware HA

Microsoft Hyper-V Cluster & VMware HASafeKit with Hyper-V
Simple and economical solution
SafeKit with Hyper-V 2012 R2
Shared disk and specific bay of diskNo shared disk
Remote sites = replicated bays across a SANRemote sites = no replicated SAN
Specific IT skills to configure the systemNo specific IT skill to configure the system
Large number of VMsLimitted number of VMs (25 VMs)

FAQ on Evidian SafeKit

Best use cases [+]

Customers [+]

Mirror cluster: demonstration, advantages [+]

Farm cluster: demonstration, advantages [+]

Application high availability modules [+]

Cloud solutions [+]

Comparison with other solutions [+]

SafeKit Webinar [+]

Pricing - Free trial [+]

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