RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which makes it possible for a system to use multiple hard drives as one single logical unit. Put simply, all the drives are used as one and the information on all of them is identical. This type of a setup has 2 key advantages over using a single drive to keep data - the first one is redundancy, so in case one drive doesn't work, the data will be accessible from the others, and the second is improved performance since the input/output, or reading/writing operations will be spread among different drives. There are different RAID types based on what number of drives are employed, if reading and writing are both handled from all drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etc. Depending on the exact setup, the error tolerance and the performance vary.
RAID in Shared Web Hosting
Our cutting-edge cloud Internet hosting platform where all shared web hosting accounts are created uses fast SSD drives rather than the traditional HDDs, and they work in RAID-Z. With this setup, a number of hard disk drives work together and at least one is a dedicated parity disk. Basically, when data is written on the other drives, it's duplicated on the parity one adding an extra bit. This is carried out for redundancy as even if some drive fails or falls out of the RAID for some reason, the info can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, so nothing will be lost and there will not be any service interruptions. This is an additional level of protection for your data in addition to the cutting-edge ZFS file system which uses checksums to ensure that all of the data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Hosting
The information uploaded to any semi-dedicated hosting account is saved on SSD drives that operate in RAID-Z. One of the drives in type of a setup is used for parity - each time data is copied on it, an additional bit is added. In case a disk happens to be problematic, it will be removed from the RAID without interrupting the functioning of the Internet sites since the data will load from the other drives, and when a brand new drive is included, the information that will be cloned on it will be a combination between the information on the parity disk and data saved on the other hard disks in the RAID. That is done to guarantee that the information that is being cloned is correct, so once the new drive is rebuilt, it can be included in the RAID as a production one. This is an extra guarantee for the integrity of your data since the ZFS file system that runs on our cloud hosting platform analyzes a unique checksum of all the copies of your files on the various drives to avoid any possibility of silent data corruption.
RAID in VPS Web Hosting
The SSD drives which we use on the machines where we generate virtual private servers work in RAID to ensure that any content that you upload will be available and intact at all times. At least one drive is employed for parity - one bit of information is added to any data cloned on it. If a main drive stops working, it is changed and the data that will be duplicated on it is calculated between the remaining drives and the parity one. This is done to make sure that the needed data 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 if you add this upgrade to your VPS plan, you will use an even more reliable web hosting service since your content will be available on multiple drives irrespective of any unexpected hardware failure.