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 module Application 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 failover Application 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 / OS Integration per application

SafeKit vs Microsoft Hyper-V Cluster & VMware HA

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

FAQ on Evidian SafeKit

Best use cases [+]

Customers [+]

Application high availability modules [+]

SafeKit Webinar [+]

Pricing - Free trial [+]

Comparison with other solutions [+]

Demonstration of a mirror cluster [+]

What are the advantages of the mirror cluster [+]

What is the recovery time (RTO) in a mirror cluster [+]

What is the data loss (RPO) in a mirror cluster [+]

Demonstration of a farm cluster [+]

What are the advantages of the farm cluster [+]

What is the recovery time (RTO) in a farm cluster [+]

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