--- title: Virtual Machine Scaling and Upgrades description: "[client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/) Guide Virtual Machine **Scaling (CPU and Memory)** This guide explains how to change (scale) the CPU cores and memory (RAM) of a cloud virtual machine (instance) from the [client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/). Since an operation equivalent to a restart occurs…" url: "https://bestnetllc.co.jp/en/docs/virtual-machine-scaling-and-upgrades/" updated: "2026-06-08" category: "BESTNET-CLOUD" --- # Virtual Machine Scaling and Upgrades [client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/) Guide Virtual Machine **Scaling (CPU and Memory)** This guide explains how to change (scale) the CPU cores and memory (RAM) of a cloud virtual machine (instance) from the [client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/). Since an operation equivalent to a restart occurs after scaling, please perform it during a planned downtime window. ScaleCPU and MemoryRestart RequiredPlanned Downtime **Notice:** This procedure guide is created using generative AI and other tools, so annotations (arrows, boxes, numbers, etc.) in the screenshots may be slightly misaligned with the actual screen display. Since the purpose is to understand the procedure intent, please prioritize the screen display and text content when performing operations. **Important:** This procedure assumes that the cloud instance has sufficient resource capacity. If the instance is short on resources, please first refer to [Cloud Resource Upgrade](https://bestnetllc.co.jp/en/docs/cloud-resource-upgrade/) to add resources on the instance side. ## Overview This procedure describes how to change (scale) the **CPU cores** and **memory (RAM)** of a cloud virtual machine (instance) from the [client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/). After scaling is executed, the server enters a task execution state (e.g., `RESETTING`), and an operation equivalent to a restart/reset occurs. Please perform this work during a planned downtime window. ## Prerequisites - You are logged in to the [client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/) - The target instance has sufficient resource capacity (refer to the link above if insufficient) - **The target server will restart during scaling**, so it is a time window where the impact is acceptable ## ScaleSteps to Scale CPU and Memory ### 1. Open “BESTNET-CLOUD” from the dashboard From **My Services** on the dashboard, click **BESTNET-CLOUD** to open the service screen. ![Opening BESTNET-CLOUD from My Services on the dashboard](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step1_select_service.png) From “My Services” on the dashboard, select “BESTNET-CLOUD”. ### 2. Select the target VM from the instance list In the **instance list** on the service screen, click the hostname of the VM you want to scale (e.g., `DEMO-HOST`). ![Selecting the target VM from the instance list](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step2_select_vm.png) In the instance list, click the hostname of the target VM. ### 3. Open “More” → “Scale” in server details Click **More** in the upper right of the server details screen, and select **Scale** from the menu. ![Opening Scale from the More menu in server details](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step3_open_scale_menu.png) From “More” in the upper right of the details screen, select “Scale”. ### 4. Configure CPU/RAM in “Scale VM” and execute On the **Scale VM** screen, set the desired **RAM** and **CPU cores**, then click **Adjust Resource Allocation**. - Enter values directly in the input fields, or adjust using the sliders - Example: RAM `2048` MB, CPU cores `2` ![Setting RAM and CPU cores on the Scale VM screen and executing](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step4_adjust_resources.png) Set the desired RAM and CPU cores, then click “Adjust Resource Allocation”. ### 5. Confirm task execution (RESETTING) and wait for completion After execution, “Server is performing a task” is displayed at the top of the screen, and the status becomes `RESETTING`. Please wait until it completes. - If the state does not change, click **Refresh** to reload the status - Console connections may be disconnected during scaling ![Waiting for task completion while the status is RESETTING](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step5_wait_for_task.png) While the status is `RESETTING`, wait until it completes. ### 6. Verify the updated CPU/RAM When the task completes, the status returns to normal (On). Confirm that the **Memory** and **CPU(s)** in the server details reflect the desired values. ![Confirming the Memory and CPU values are reflected after scaling](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step6_verify_resources.png) Confirm that “Memory” and “CPU(s)” in the server details show the desired values. ## Additional Notes ### Performing on production systems - **Impact:** A reset/restart occurs after scaling, so for production systems please perform it during a planned downtime - **OS-level check:** If necessary, log in to the guest OS and confirm that the CPU/memory is recognized correctly ### If changes don’t apply or it fails - **If the state does not change after refreshing** or an error is displayed, please contact us via a [support ticket](https://bestnetllc.co.jp/en/encyclopedia/support-ticket-en/) - If it remains in `RESETTING` for a long time without completing, please contact us in the same way