RAID, or Redundant Array of Independent Disks, is a technology for saving data on several hard disks that operate together as one single logical unit. The drives could be physical or logical i.e. in the aforementioned case one single drive is split into individual ones via virtualization software. In either case, exactly the same data is saved on all drives and the basic advantage of employing such a setup is that if a drive stops working, the data shall still be available on the remaining ones. Having a RAID also enhances the performance because the input and output operations will be spread among a couple of drives. There are several kinds of RAID depending on how many hard drives are used, whether writing is carried out on all the drives in real time or just on one, and how the info is synchronized between the hard drives - whether it is recorded in blocks on one drive after another or all of it is mirrored from one on the others. All of these factors suggest that the fault tolerance as well as the performance between the various RAID types could differ.

RAID in Cloud Website Hosting

The SSD drives which our cutting-edge cloud web hosting platform uses for storage operate in RAID-Z. This sort 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 special drive where information kept on the other drives is copied with an additional bit added to it. In case one of the disks stops functioning, your Internet sites will continue working from the other ones and after we replace the malfunctioning one, the data that will be cloned on it will be rebuilt from what is stored on the other drives together with the info from the parity disk. This is done in order to be able to recalculate the elements of each file adequately and to validate the integrity of the information copied on the new drive. This is an additional level of security for the information that you upload to your cloud website hosting account in addition to the ZFS file system which compares a unique digital fingerprint for each file on all the disk drives in real time.

RAID in Semi-dedicated Hosting

The info uploaded to any semi-dedicated hosting account is saved on SSD drives that function in RAID-Z. One of the drives in such a configuration is used for parity - whenever data is cloned on it, an extra bit is added. If a disk happens to be problematic, it will be removed from the RAID without disturbing the operation of the sites because the data will load from the rest of the drives, and when a brand new drive is included, the data which will be copied on it will be a mix between the info on the parity disk and data stored on the other hard drives in the RAID. This is done to guarantee that the information that is being copied is accurate, so as soon as the new drive is rebuilt, it could be included in the RAID as a production one. This is one more warranty for the integrity of your data as the ZFS file system which runs on our cloud Internet hosting platform compares a special checksum of all copies of the files on the various drives so as to avoid any probability of silent data corruption.

RAID in VPS Hosting

The SSD drives which we use on the physical machines where we set up virtual private servers operate in RAID to ensure that any content that 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. In case a main drive stops working, it is replaced and the information that will be duplicated on it is calculated between the rest of the drives and the parity one. It's done this way to ensure that the right info is copied and that not a single file is corrupted because the new drive will be a part of the RAID afterwards. We also use hard disks operating in RAID on the backup servers, so in case you add this upgrade to your VPS plan, you'll use an even more reliable web hosting service because your content will be available on multiple drives irrespective of any sudden hardware malfunction.