In simple terms, 1 inode equals to 1 file. Once the number of inodes allowed on the server has been reached, you should either change the package or delete unnecessary files. The limitation of the inodes is introduced for a more stable functioning of virtual servers.
You are able to get an overview of the number of currently used inodes from the server management interface.
Inode, or more precisely index node – is the UNIX data structure that stores information regarding file system objects, such as files, directories etc. Inode stores the information regarding the owner, what rights are given to the particular file, it’s size etc. Therefore, for each directory, file and other item in the file system there is an inode that stores its metadata.
The number of objects can drastically affect the performance of the file system. Poorly built applications can be the cause of excessive inode usage. Web stores also require a large amount of inodes by using a variety of small-sized files that store information.
Inodes can be added by upgrading the server package or by ordering them as an additional service. Price list for the packages and additional services can be found here.