RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which permits a system to employ multiple hard drives as a single logical unit. To put it differently, all the drives are used as one and the info on all of them is the same. This kind of a setup has 2 huge advantages over using a single drive to save data - the first is redundancy, so if one drive doesn't work, the information will be accessed from the remaining ones, and the second is better performance as the input/output, or reading/writing operations will be distributed among different drives. There're different RAID types depending on what number of drives are used, whether reading and writing are both performed from all of the drives at the same time, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. Based on the exact setup, the fault tolerance and the performance may differ.

RAID in Shared Hosting

The SSD drives that our cutting-edge cloud hosting platform employs for storage work in RAID-Z. This type of RAID is designed to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a specific drive where data located on the other drives is cloned with an additional bit added to it. If one of the disks stops working, your Internet sites will continue working from the other ones and after we replace the bad one, the data that will be cloned on it will be recovered from what is stored on the other drives as well as the info from the parity disk. This is performed in order to be able to recalculate the bits of every single file correctly and to confirm the integrity of the data duplicated on the new drive. This is an additional level of security for the info you upload to your shared hosting account in addition to the ZFS file system that compares a unique digital fingerprint for every single file on all disk drives in real time.

RAID in Semi-dedicated Hosting

The info uploaded to any semi-dedicated hosting account is kept on SSD drives which function in RAID-Z. One of the drives in type of a configuration is used for parity - any time data is copied on it, an extra bit is added. If a disk turns out to be problematic, it will be taken out of the RAID without disturbing the operation of the Internet sites since the data will load from the remaining drives, and when a new drive is included, the info which will be copied on it will be a combination between the information on the parity disk and data saved on the other hard drives in the RAID. This is done to ensure that the data that is being copied is accurate, so the moment the new drive is rebuilt, it could be integrated into the RAID as a production one. This is an extra warranty for the integrity of your info as the ZFS file system which runs on our cloud Internet hosting platform analyzes a special checksum of all of the copies of your files on the various drives in order to avoid any probability of silent data corruption.

RAID in VPS Hosting

The SSD drives that we use on the physical machines where we set up virtual private servers function in RAID to make sure that any content which you upload will be available and intact all of the time. At least a single drive is used for parity - one bit of data is added to any data copied on it. If a main drive fails, it is changed and the information that will be copied on it is calculated between the other drives and the parity one. It's done this way to make sure that the right info is copied and that not a single file is corrupted because the new drive will be included in the RAID afterwards. In addition, we use hard drives functioning in RAID on the backup servers, so if you add this upgrade to your VPS package, you shall use an even more reliable web hosting service since your content will be available on multiple drives irrespective of any unpredicted hardware failure.