The process of files getting damaged as a result of some hardware or software failure is called data corruption and this is one of the main problems that hosting companies face because the larger a hard disk is and the more info is kept on it, the more likely it is for data to be corrupted. You will find several fail-safes, still often the data becomes corrupted silently, so neither the file system, nor the administrators see a thing. Because of this, a bad file will be treated as a standard one and if the hard disk is part of a RAID, that file will be copied on all other disk drives. In theory, this is for redundancy, but in reality the damage will be worse. The moment a given file gets corrupted, it will be partially or fully unreadable, which means that a text file will no longer be readable, an image file will present a random mix of colors in case it opens at all and an archive will be impossible to unpack, and you risk sacrificing your site content. Although the most well-known server file systems feature various checks, they are likely to fail to identify some problem early enough or require a long period of time to check all the files and the server will not be operational in the meantime.
No Data Corruption & Data Integrity in Hosting
We've tackled the matter of silent data corruption on all our hosting servers by using the state-of-the-art Z file system, or ZFS. The latter is better than other file systems as it is the only one in existence which checks all of the files instantly by using a checksum - a digital identifier that is 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 constantly compares the checksum of all files and if any file is detected as damaged, it is replaced right away with a good copy from another disk. As this happens in real time, there is no risk that a corrupted file may remain or may be copied on the other SSDs. ZFS requires lots of physical memory in order to execute the real-time checks and the advantage of our cloud web hosting platform is that we employ multiple powerful servers working together. In case you host your sites with us, your info will be undamaged no matter what.
No Data Corruption & Data Integrity in Semi-dedicated Servers
We've avoided any possibility of files getting damaged silently since the servers where your semi-dedicated server account will be created work with a powerful file system known as ZFS. Its basic advantage over various other file systems is that it uses a unique checksum for every single file - a digital fingerprint that's checked in real time. Since we store all content on multiple SSD drives, ZFS checks whether the fingerprint of a file on one drive corresponds to the one on the remaining drives and the one it has saved. In the event that there is a mismatch, the damaged copy is replaced with a good one from one of the other drives and considering that it happens in real time, there's no chance that a corrupted copy can remain on our servers or that it could be copied to the other drives in the RAID. None of the other file systems employ this kind of checks and what is more, even during a file system check following a sudden power failure, none of them will identify silently corrupted files. In comparison, ZFS will not crash after a power loss and the continual checksum monitoring makes a time-consuming file system check obsolete.