Redundant Array of Independent Disks, or RAID, is a way of keeping content on several hard disk drives at the same time. A RAID might be software or hardware based on the drives which are used - physical or logical ones, still what’s common between them is the fact that they all function as a single unit where data is kept. The key advantage of employing a RAID is redundancy since the info on all drives will be exactly the same all the time, so even in the event that some drive fails for some reason, the information will still be present on the rest of the drives. The overall performance is also enhanced because the reading and writing processes could be split between different drives, so a single one won't be overloaded. There are different types of RAIDs where the effectiveness and fault tolerance can vary based on the exact setup - whether data is written on all of the drives real-time or it is written on a single drive and then mirrored on another, the number of drives are used for the RAID, and many others.

RAID in Web Hosting

The revolutionary cloud web hosting platform where all web hosting accounts are generated employs quick SSD drives as an alternative to the classic HDDs, and they work in RAID-Z. With this setup, multiple hard disk drives function together and at least one of them is a dedicated parity disk. In simple terms, when data is written on the remaining drives, it is copied on the parity one adding an extra bit. This is done for redundancy as even if some drive fails or falls out of the RAID for whatever reason, the data can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, so absolutely nothing will be lost and there won't be any service disturbances. This is one more level of security for your data in addition to the state-of-the-art ZFS file system that uses checksums to guarantee that all the data on our servers is intact and is not silently corrupted.

RAID in Semi-dedicated Hosting

The info uploaded to any semi-dedicated hosting account is stored on SSD drives which operate in RAID-Z. One of the drives in type of a setup is used for parity - every time data is cloned on it, an additional bit is added. If a disk turns out to be flawed, it will be removed from the RAID without disturbing the work of the websites since the data will load from the other drives, and when a new drive is included, the information that will be duplicated on it will be a combination between the info on the parity disk and data stored on the other hard disks in the RAID. This is done in order to ensure that the data that is being copied is correct, so once the new drive is rebuilt, it can be incorporated into the RAID as a production one. This is one more guarantee for the integrity of your info because the ZFS file system which runs on our cloud hosting platform compares a special checksum of all copies of your files on the various drives to be able to avoid any probability of silent data corruption.

RAID in VPS

The SSD drives that we use on the machines where we generate virtual private servers work in RAID to make sure that any content which you upload will be available and intact all the time. At least one drive is employed for parity - one bit of information is added to any data cloned on it. In the event that a main drive breaks down, it is replaced and the data that will be duplicated on it is calculated between the rest of the drives and the parity one. This is done to make sure that the required information is copied and that not a single file is corrupted since the new drive will be incorporated into the RAID afterwards. Also, we use hard drives working in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you will use an even more reliable Internet hosting service since your content will be available on multiple drives irrespective of any kind of sudden hardware failure.