Data corruption is the accidental modification of a file or the loss of information that usually occurs during reading or writing. The reason could be hardware or software malfunction, and consequently, a file can become partially or fully corrupted, so it'll no longer work correctly since its bits shall be scrambled or lacking. An image file, for instance, will no longer display an accurate image, but a random combination of colors, an archive will be impossible to unpack because its content will be unreadable, and so on. In the event that this kind of a problem appears and it isn't noticed by the system or by an administrator, the data will become corrupted silently and in case this happens on a disk drive that's part of a RAID array where the info is synchronized between different drives, the corrupted file shall be reproduced on all of the other drives and the harm will be permanent. A number of commonly used file systems either don't feature real-time checks or do not have good ones that can detect an issue before the damage is done, so silent data corruption is a common matter on hosting servers where large volumes of information are kept.
No Data Corruption & Data Integrity in Cloud Web Hosting
We have tackled the problem of silent data corruption on all of our cloud web hosting servers by using the cutting-edge Z file system, or ZFS. The latter is better than other file systems since it is the only one in existence that checks all the files in real time by employing a checksum - a digital identifier that's unique for every single file. When you upload content to your account, it will 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's replaced right away 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 copied on the other SSDs. ZFS needs a lot of physical memory to perform the real-time checks and the benefit of our cloud hosting platform is that we use multiple very powerful servers working together. In case you host your websites with us, your info will be intact no matter what.
No Data Corruption & Data Integrity in Semi-dedicated Servers
We have avoided any possibility of files getting damaged silently because the servers where your semi-dedicated server account will be created take advantage of 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 keep all content on numerous SSD drives, ZFS checks if the fingerprint of a file on one drive matches the one on the rest of the drives and the one it has saved. In case there is a mismatch, the damaged copy is replaced with a healthy one from one of the other drives and since this happens in real time, there's no chance that a damaged copy can remain on our servers or that it could be duplicated to the other hard drives in the RAID. None of the other file systems work with this kind of checks and what's more, even during a file system check right after an unexpected blackout, none of them will discover silently corrupted files. In contrast, ZFS will not crash after a power failure and the continual checksum monitoring makes a time-consuming file system check obsolete.
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