RAID, or Redundant Array of Independent Disks, is a technology for saving data on multiple hard disks that work together as a single logical unit. The drives can be physical or logical i.e. in the second case one single drive is split into different ones via virtualization software. In either case, identical data is kept on all of the drives and the basic benefit of employing such a setup is that if a drive stops working, the data shall still be available on the remaining ones. Employing a RAID also improves the performance because the input and output operations will be spread among a couple of drives. There are several types 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 synced between the drives - whether it's recorded in blocks on one drive after another or it is mirrored from one on the others. All these factors mean that the fault tolerance and the performance between the various RAID types may differ.
RAID in Cloud Web Hosting
The SSD drives which our cutting-edge cloud hosting platform employs for storage work in RAID-Z. This kind of RAID is intended to work with the ZFS file system which runs on the platform and it uses 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 fails, your sites shall continue working from the other ones and after we replace the malfunctioning one, the information that will be duplicated on it will be rebuilt from what is stored on the other drives together with the data from the parity disk. This is performed in order to be able to recalculate the bits of every file properly and to confirm the integrity of the info copied on the new drive. This is one more level of security for the info that you upload to your cloud web hosting account together with the ZFS file system which compares a special digital fingerprint for each file on all drives in real time.
RAID in Semi-dedicated Hosting
The RAID type that we employ for the cloud hosting platform where your semi-dedicated hosting account will be created is known as RAID-Z. What is different about it is that at least 1 of the disks is used as a parity drive. Put simply, whenever any kind of data is cloned on this specific disk drive, one more bit is added to it and in case a faulty disk is replaced, the info that will be cloned on it is a mix of the data on the remaining hard disks in the RAID and that on the parity one. This is done to guarantee that the info is intact. During this process, your sites will be up and running normally since RAID-Z allows for a whole drive to fail without any service disturbances and it simply uses one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to ensure that no data can get silently corrupted on our servers, you will not need to worry about the integrity of your files.
RAID in VPS Hosting
The physical servers where we make virtual private server employ super fast SSD drives that will increase the speed of your websites noticeably. The drives work in RAID to guarantee that you will not lose any data due to a power loss or a hardware breakdown. The production servers take advantage of a variety of drives where the information is kept and one disk is used for parity i.e. one bit is added to all of the data copied on it, that makes it much easier to recover the site content without loss in case a main drive fails. If you pick our backup service, the information will be saved on an individual machine which uses standard hard-disk drives and despite the fact that there isn't a parity one in this case, they are also in a RAID to make sure that we will have a backup copy of your site content all of the time. With this kind of setup your information will always be safe as it will be available on multiple disk drives.