The process of files being corrupted as a result of some hardware or software failure is referred to as data corruption and this is among the main problems which Internet hosting companies face as the larger a hard disk is and the more data is filed on it, the much more likely it is for data to be corrupted. You will find several fail-safes, still often the information is damaged silently, so neither the file system, nor the admins notice a thing. As a result, a damaged file will be treated as a good one and if the hard disk drive is a part of a RAID, the file will be duplicated on all other disk drives. Theoretically, this is for redundancy, but in practice the damage will be worse. When a file gets damaged, it will be partially or completely unreadable, so a text file will not be readable, an image file will present a random combination of colors if it opens at all and an archive shall be impossible to unpack, and you risk losing your website content. Although the most popular server file systems include various checks, they are likely to fail to discover some problem early enough or require an extensive amount of time to be able to check all of the files and the hosting server will not be functional in the meantime.
No Data Corruption & Data Integrity in Shared Hosting
We have tackled the issue of silent data corruption on all our shared hosting servers by using the advanced Z file system, or ZFS. The latter is more advanced than other file systems since it is the only one out there which checks all the files instantly by employing 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 constantly synchronized between them for redundancy. ZFS constantly analyzes the checksum of all files and when any file is detected as corrupted, it's replaced immediately with a good copy from some other disk. As this happens in real time, there's no risk that a damaged file may remain or may be copied on the remaining SSDs. ZFS needs plenty of physical memory to perform the real-time checks and the advantage of our cloud hosting platform is that we take advantage of 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 corrupted silently due to the fact that the servers where your semi-dedicated server account will be created employ a powerful file system known as ZFS. Its basic advantage over other file systems is that it uses a unique checksum for each file - a digital fingerprint that is checked in real time. Since we keep all content on multiple SSD drives, ZFS checks whether the fingerprint of a file on one drive corresponds to the one on the other drives and the one it has saved. If there is a mismatch, the bad copy is replaced with a healthy one from one of the other drives and because it happens instantly, there is no chance that a corrupted copy can remain on our web servers or that it can be duplicated to the other hard drives in the RAID. None of the other file systems use this type of checks and what is more, even during a file system check following an unexpected blackout, none of them will discover silently corrupted files. In contrast, ZFS doesn't crash after an electrical power failure and the continual checksum monitoring makes a lenghty file system check unneeded.