RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that enables a system to use a number of hard drives as a single logical unit. Put simply, all drives are used as one and the information on all of them is the same. This type of a configuration has two major advantages over using a single drive to save data - the first one is redundancy, so in the event that one drive doesn't work, the information will be accessible from the others, and the second one is improved performance since the input/output, or reading/writing operations will be spread among multiple drives. There're different RAID types based on what amount of drives are used, if reading and writing are both done from all the drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Based on the exact setup, the error tolerance and the performance could differ.

RAID in Shared Hosting

The disk drives that we employ for storage with our revolutionary cloud hosting platform are not the traditional HDDs, but fast solid-state drives (SSD). They operate in RAID-Z - a special setup intended for the ZFS file system which we use. Any content that you upload to the shared hosting account will be saved on multiple drives and at least 1 shall be employed as a parity disk. This is a special drive where a further bit is included to any content copied on it. If a disk in the RAID fails, it'll be replaced without any service interruptions and the information will be recovered on the new drive by recalculating its bits using the data on the parity disk along with that on the other disks. This is done so as to guarantee the integrity of the info and together with the real-time checksum verification that the ZFS file system performs on all drives, you won't ever have to be concerned about losing any data no matter what.

RAID in Semi-dedicated Hosting

The info uploaded to any semi-dedicated hosting account is stored on SSD drives that operate in RAID-Z. One of the drives in type of a configuration is used for parity - any time data is cloned on it, an additional bit is added. If a disk turns out to be faulty, it will be taken out of the RAID without disturbing the work of the sites as the data will load from the rest of the drives, and when a brand new drive is added, the information that will be cloned on it will be a combination between the data on the parity disk and data saved on the other hard disks in the RAID. That is done so as to guarantee that the data which is being duplicated is accurate, so once the new drive is rebuilt, it could be incorporated into the RAID as a production one. This is an extra warranty for the integrity of your information because the ZFS file system that runs on our cloud hosting platform compares a special checksum of all copies of your files on the separate drives to avoid any chance of silent data corruption.

RAID in VPS Hosting

The SSD drives that we use on the machines where we set up virtual private servers operate in RAID to make sure that any content you upload will be available and intact all of the time. At least one drive is used for parity - one bit of info is added to any data cloned on it. In case a main drive breaks down, it is changed and the data that will be cloned 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 no file is corrupted as the new drive will be included in the RAID afterwards. Also, we use hard disk drives working in RAID on the backup servers, so in case you add this upgrade to your VPS plan, you shall use an even more reliable hosting service since your content will be available on multiple drives irrespective of any kind of unexpected hardware malfunction.