Choosing the correct hosting plan can be quite a difficult task. To start with, please carefully review the hosting options on our website. If you have any queries at all please do not hesitate to contact our sales team.
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You are likely comparing the values in the Control Panel with the size and/or usage displayed in your server's metrics dashboard or output by the df command, which the dashboard should match.
Despite df being short for 'disk free', it actually reports the total size and usage of each file system, rather than each disk. Since file systems allocate some amount of disk space up front for their own use (often proportional to the size of the disk!), this means that the total size you see in the dashboards and from df will be a bit less than the disk size reported by the Control Panel.
If you'd like to specifically view the size of your disks, not file systems, on your server, you can run the lsblk ('list block devices') command or
consult the Control Panel, whose disk sizes should match lsblk. For the curious, a 'block device' is Unix parlance for disks, partitions, and other
devices which can be read from and/or written to in blocks of bits.
The disk space that file systems allocate up front for themselves is used in ways that vary between specific file systems (such as ext4, btrfs, and zfs). If you have provisioned a server with us, it will most likely be using ext4, which pre-allocates space for file metadata (time stamps, permissions, and so forth) and reserves some space for the root user to ensure the system can be recovered if the disk fills up.