# Sizes and scaling

## The three sizes

| Size    | vCPU | Guaranteed memory | NVMe SSD |
| ------- | ---- | ----------------- | -------- |
| Ultra 1 | 2    | 4 GB              | 60 GB    |
| Ultra 2 | 4    | 8 GB              | 120 GB   |
| Ultra 3 | 6    | 12 GB             | 200 GB   |

Every size includes its dedicated IPv4 address, the nightly backup, monitoring and Full-Stack Assistance. Prices, monthly or yearly with one month free, are on the [VPS Ultra page](https://www.simafri.com/en/vps-ultra/).

## Guaranteed memory

The memory of your VPS Ultra is reserved for it: it remains available to your applications at all times, whatever the activity of other servers. So you size it precisely: the memory of your database, of each process of your application, and the headroom for your peaks.

## Moving up to a larger size

Your VPS Ultra moves up to a larger size **at any time, without reinstalling**: your data, your addresses and your settings stay in place.

1. Write to support with your server's name and the size you want.
2. Our team sends you the proforma for the change, at the rate of the new size from the date of the change, and agrees the timing with you.
3. Your server reboots once with its new resources.

On Linux, the extra disk space is added to your file system; our team tells you the command suited to your system, or applies it for you.

## Moving down to a smaller size

Write to support with the size you want: the change takes effect the following month, at your next due date.

## Tracking your resources

| Resource  | The command        | What it tells you                                        |
| --------- | ------------------ | -------------------------------------------------------- |
| memory    | `free -h`          | the memory used and the **available** memory             |
| processor | `htop` or `uptime` | the load, compared with the number of vCPUs in your size |
| disk      | `df -h /`          | the space used and the free space                        |

Our monitoring also tracks your server's load and disk space, and alerts you when an indicator calls for it: it is often the right moment to tidy up or to move up to a larger size.