Avoided a full day of downtime by migrating legacy systems without changing IP addresses
Completed cutover in under an hour using pre-testing features in Migrate to Virtual Machines (M2VM)
Improved infrastructure stability and performance by replacing aging systems nearing end-of-support
Established a foundation for modernization, clearing the way for cloud-native architecture
TRIAL Company migrated legacy systems to the cloud — without the disruption of changing IP addresses. This reduced downtime and paved the way for future cloud-native application modernization.
TRIAL Company's existing IT environment was complex, with a mix of packaged software, systems co-developed with IT vendors, and in-house applications. That variety made it difficult to maintain and update. One of the biggest reasons for migrating was that the company's on-premises virtual infrastructure – running entirely out of a single data center – was nearing end-of-support. They needed a more stable, scalable, and high-performance platform to keep up with business growth.
Some of the legacy systems posed significant migration barriers, including older, in-house platforms that were increasingly difficult to support, limited visibility into system functions, a lack of design documentation, and hardcoded IP addresses. Internal estimates suggested that readdressing those systems for migration could require a full day of downtime. To avoid that risk and effort, the development team flagged one critical requirement: migrate to the cloud without changing existing IP addresses.
TRIAL Company had already adopted cloud-native practices for newer systems and was eager to extend those benefits across the organization. Because of their existing Enterprise Discount Program (EDP) agreement with Google Cloud and the introduction of Hybrid Subnets, Google Cloud became the natural fit. A successful proof of concept demonstrated that Google Cloud could support the migration with minimal downtime and without the disruption of readdressing systems, something other options couldn't guarantee.
To truly unlock the value of the cloud — in terms of cost optimization and operational resilience — you need to become cloud-native. A simple 'lift' migration offers limited benefits. The real transformation comes next, but this successful migration provides the essential first step.
Tatsuo Hyakutake
Department Manager Business Process Reform Infrastructure Systems Department Systems Division, TRIAL Company
TRIAL Company adopted a solution combining Google Cloud's Hybrid Subnets and Migrate to Virtual Machines (M2VM) to move legacy systems to the cloud without changing IP addresses. First, Hybrid Subnets allowed on-premises subnets and Google Cloud Virtual Private Cloud (VPC) subnets to function as a single, unified logical subnet. This setup meant the team could migrate VMs to Google Cloud without rewriting IP dependencies – ideal for legacy workloads with hardcoded configurations.
The key benefit of Hybrid Subnets was extending our logical network seamlessly between our on-premises environment and the cloud. We validated its feasibility through our PoC.
Junichiro Yamada
Infrastructure Engineer Business Process Reform Infrastructure Systems Department Systems Division, TRIAL Company
Before moving production systems, the team ran a proof of concept to validate the approach. They then used M2VM to replicate workloads in the background and test clones in advance, without disrupting the source systems. No client-side agents or intrusive setup was required. During cutover, workloads transitioned to the cloud with just 50 minutes of downtime – far less than the full day that had been projected for traditional migration methods.
For TRIAL's infrastructure engineers, being able to pre-test bandwidth settings and image uploads in M2VM before going live was especially valuable. Now that critical systems are up and running in Google Cloud, the team can begin refactoring its subnet structure and modernizing applications over time using a Strangler Fig pattern. The result is a stable, high-performance foundation that supports ongoing business growth and finally unlocks cloud-native design across the organization.
Without Hybrid Subnets, we would have faced a full day of downtime to readdress legacy systems. Instead, we migrated with less than an hour of disruption — and no rework.
Junichiro Yamada
Infrastructure Engineer, TRIAL Company
TRIAL Company, Inc. operates over 300 supercenters across Japan under the concept: "Your daily essentials store." The company is advancing retail digital transformation with innovations like the "Skip Cart," a shopping cart with built-in self-checkout functionality developed by one of its group companies.
Industry: Retail
Location: Japan
Products: Hybrid Subnets, Migrate to Virtual Machines, Virtual Private Cloud