Data corruption is the accidental transformation of a file or the losing of information that often occurs during reading or writing. The reason can be hardware or software malfunction, and for that reason, a file can become partially or completely corrupted, so it'll no longer work properly because its bits will be scrambled or lacking. An image file, for instance, will no longer show a true image, but a random combination of colors, an archive will be impossible to unpack since its content will be unreadable, etc. When this kind of a problem occurs and it's not recognized by the system or by an admin, the data will be corrupted silently and when this happens on a drive which is part of a RAID array where the info is synchronized between various different drives, the corrupted file shall be replicated on all the other drives and the harm will become permanent. A large number of popular file systems either don't offer real-time checks or do not have good ones that will detect an issue before the damage is done, so silent data corruption is a very common matter on web hosting servers where huge amounts of data are stored.
No Data Corruption & Data Integrity in Shared Web Hosting
We have resolved the problem of silent data corruption on all our shared web hosting servers by using the advanced Z file system, or ZFS. The latter is superior to other file systems since it is the only one in existence that checks all the files right away by employing a checksum - a digital identifier which is unique for each and every file. When you upload content to your account, it'll be stored on several SSD drives and constantly synced between them for redundancy. ZFS constantly analyzes the checksum of all files and in case any file is detected as corrupted, it's replaced promptly with a good copy from another disk. As this happens in real time, there's no risk that a damaged file may remain or may be duplicated on the rest of the SSDs. ZFS requires lots of physical memory to perform the real-time checks and the advantage of our cloud website hosting platform is that we take advantage of multiple very powerful servers working together. In case you host your Internet sites with us, your data will be undamaged no matter what.
No Data Corruption & Data Integrity in Semi-dedicated Hosting
We have avoided any probability of files getting damaged silently due to the fact that the servers where your semi-dedicated hosting account will be created use a powerful file system known as ZFS. Its main advantage over alternative file systems is that it uses a unique checksum for each file - a digital fingerprint that is checked in real time. As we store all content on multiple SSD drives, ZFS checks if the fingerprint of a file on one drive corresponds to the one on the remaining drives and the one it has stored. In case there's a mismatch, the corrupted copy is replaced with a good one from one of the other drives and considering that this happens in real time, there is no chance that a damaged copy can remain on our servers or that it can be copied to the other drives in the RAID. None of the other file systems include this type of checks and what is more, even during a file system check right after a sudden blackout, none of them can detect silently corrupted files. In comparison, ZFS won't crash after a blackout and the constant checksum monitoring makes a lenghty file system check obsolete.