The process of files being corrupted resulting from some hardware or software failure is known as data corruption and this is among the main problems which web hosting companies face since the larger a hard disk is and the more data is filed on it, the much more likely it is for data to become corrupted. You can find several fail-safes, still often the information gets corrupted silently, so neither the file system, nor the administrators notice anything. As a result, a corrupted file will be handled as a good one and if the hard disk is part of a RAID, the file will be copied on all other disk drives. In theory, this is for redundancy, but in practice the damage will get worse. The moment a given file gets corrupted, it will be partially or completely unreadable, so a text file will no longer be readable, an image file will display a random mix of colors in case it opens at all and an archive will be impossible to unpack, so you risk losing your content. Although the most frequently used server file systems have various checks, they are likely to fail to find some problem early enough or require an extensive period of time to check all of the files and the web server will not be functional for the time being.
No Data Corruption & Data Integrity in Shared Web Hosting
We've resolved the matter of silent data corruption on all our shared web hosting servers by using the leading-edge Z file system, or ZFS. The latter is more advanced than other file systems because it is the only one in existence which checks all of the files immediately by using a checksum - a digital identifier that's unique for each and every file. When you upload content to your account, it'll be stored on several SSD drives and continually synchronized between them for redundancy. ZFS regularly compares the checksum of all files and in the event that any file is detected as damaged, it is replaced immediately with a good copy from some other disk. As this happens in real time, there's no risk that a corrupted file may remain or may be copied on the other SSDs. ZFS needs a lot of physical memory in order to carry out the real-time checks and the advantage of our cloud hosting platform is that we work with multiple very powerful servers working together. In case you host your Internet sites with us, your information will be intact no matter what.
No Data Corruption & Data Integrity in Semi-dedicated Servers
We've avoided any possibility of files getting corrupted silently since the servers where your semi-dedicated server account will be created work with a powerful file system called ZFS. Its key advantage over other file systems is that it uses a unique checksum for every single file - a digital fingerprint which is checked in real time. Since we save all content on a number of SSD drives, ZFS checks whether the fingerprint of a file on one drive matches the one on the rest of the drives and the one it has stored. When there is a mismatch, the bad copy is replaced with a good one from one of the other drives and considering that it happens right away, there is no chance that a damaged copy could remain on our web servers or that it can be duplicated to the other drives in the RAID. None of the other file systems use such checks and what is more, even during a file system check following a sudden power loss, none of them can detect silently corrupted files. In contrast, ZFS doesn't crash after a blackout and the continual checksum monitoring makes a time-consuming file system check unnecessary.