Data corruption is the unintentional change of a file or the loss of information which often occurs during reading or writing. The reason can be hardware or software failure, and as a result, a file can become partially or completely corrupted, so it will no longer function correctly as its bits shall be scrambled or lacking. An image file, for instance, will no longer show an authentic image, but a random mix of colors, an archive will be impossible to unpack since its content will be unreadable, etc. If such an issue appears and it is not found by the system or by an admin, the data will become corrupted silently and if this happens on a drive which is part of a RAID array where the data is synced between various different drives, the corrupted file shall be replicated on all of the other drives and the damage will be long term. A number of widely used file systems either do not offer real-time checks or don't have high quality ones that will detect an issue before the damage is done, so silent data corruption is a rather common issue on hosting servers where substantial amounts of data are stored.
No Data Corruption & Data Integrity in Shared Hosting
We've tackled the problem of silent data corruption on our shared hosting servers by using the state-of-the-art Z file system, or ZFS. The latter is superior to other file systems since it is the only one out there that checks all of the files immediately by employing a checksum - a digital identifier that's unique for every single file. When you upload content to your account, it'll be stored on several SSD drives and regularly synced between them for redundancy. ZFS regularly compares the checksum of all files and in case any file is detected as corrupted, it is replaced instantly with a good copy from another disk. As this happens in real time, there is no risk that a damaged file may remain or may be duplicated on the rest of the SSDs. ZFS requires lots of physical memory in order to carry out the real-time checks and the advantage of our cloud web hosting platform is that we use multiple very powerful servers working together. If you host your sites with us, your data will be undamaged no matter what.