RAID, or Redundant Array of Independent Disks, is a technology of saving data on a number hard drives which function together as one single logical unit. The drives can be physical or logical i.e. in the second case a single drive is split into independent ones through virtualization software. In any case, exactly the same information is kept on all of the drives and the main advantage of employing such a setup is that if a drive stops working, the data will remain available on the remaining ones. Using a RAID also boosts the performance because the input and output operations will be spread among a couple of drives. There are several kinds of RAID dependant upon how many hard disks are used, whether writing is carried out on all drives in real time or just on one, and how the data is synced between the hard drives - whether it's written in blocks on one drive after another or all of it is mirrored from one on the others. All these factors suggest that the error tolerance as well as the performance between the different RAID types may vary.
RAID in Cloud Hosting
The drives which we employ for storage with our top-notch cloud web hosting platform are not the standard HDDs, but super fast solid-state drives (SSD). They function in RAID-Z - a special setup developed for the ZFS file system which we employ. Any content that you add to your cloud hosting account will be kept on multiple hard drives and at least one of them will be used as a parity disk. This is a specific drive where a further bit is added to any content copied on it. If a disk in the RAID stops working, it'll be changed without any service disturbances and the info will be rebuilt on the new drive by recalculating its bits thanks to the data on the parity disk along with that on the other disks. This is done in order to guarantee the integrity of the info and together with the real-time checksum validation which the ZFS file system executes on all drives, you will never need to worry about losing any info no matter what.
RAID in Semi-dedicated Servers
The RAID type that we use for the cloud hosting platform where your semi-dedicated server account will be created is called RAID-Z. What is different about it is that at least 1 of the disks is employed as a parity drive. In simple terms, whenever any kind of data is cloned on this special drive, one more bit is included to it and if a malfunctioning disk is replaced, the information that will be duplicated on it is a combination of the data on the remaining hard drives in the RAID and that on the parity one. It's done this way to guarantee that your info is intact. During this process, your Internet sites will be working normally since RAID-Z enables a whole drive to fail without any service disturbances and it simply uses one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system that uses checksums to guarantee that no data will get silently corrupted on our servers, you will never need to worry about the integrity of your files.
RAID in VPS Servers
If you employ one of our VPS server plans, any content that you upload will be stored on SSD drives which operate in RAID. At least a single drive is intended for parity so as to guarantee the integrity of the information. In simple terms, this is a special drive where info is copied with one bit added to it. If a disk from the RAID breaks down, your websites will continue working and when a new disk takes the place of the malfunctioning one, the bits of the data that will be duplicated on it are calculated using the healthy and the parity drives. By doing this, any potential for corrupting data throughout the process is avoided. We also employ ordinary hard disk drives which operate in RAID for storing backup copies, so should you include this service to your VPS plan, your website content will be stored on multiple drives and you won't ever have to worry about its integrity even in the event of multiple drive failures.