Redundant Array of Independent Disks, or RAID, is a method of storing content on several hard disks at the same time. A RAID might be software or hardware depending on the drives that are used - physical or logical ones, still what’s common between them is the fact that they all operate as a single unit where your information is saved. The key advantage of using a RAID is redundancy since the data on all the drives is the same all the time, so even in case some drive fails for whatever reason, the data will still be present on the remaining drives. The general performance will also improve because the reading and writing processes can be split between multiple drives, so a single one won't be overloaded. There're different sorts of RAIDs where the functionality and fault tolerance may differ depending on the particular setup - whether info is written on all drives real-time or it is written on one drive and afterwards mirrored on another, the number of drives are used for the RAID, and many others.
RAID in Hosting
The hard drives that we employ for storage with our ground-breaking cloud Internet 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 use. Any content that you add to the hosting account will be kept on multiple drives and at least one shall be employed as a parity disk. This is a specific drive where an extra bit is added to any content copied on it. In the event that a disk in the RAID stops functioning, it will be replaced without any service disturbances and the data will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk along with that on the remaining disks. This is done to guarantee the integrity of the info and together with the real-time checksum authentication which the ZFS file system performs on all drives, you won't ever need to be concerned about losing any data no matter what.
RAID in Semi-dedicated Hosting
The RAID type which we employ for the cloud Internet hosting platform where your semi-dedicated hosting account shall be created is called RAID-Z. What is different about it is that at least one of the disks is employed as a parity drive. Simply put, whenever any data is duplicated on this specific disk drive, one more bit is added to it and in case a defective disk is replaced, the info that will be copied on it is a combination of the data on the other disk drives in the RAID and that on the parity one. This is done to ensure that your info is intact. During this process, your websites will be working normally as RAID-Z enables a whole drive to fail without causing any service disturbances and it simply uses one of the other ones as the main production drive. Employing 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 never have to worry about the integrity of your files.
RAID in VPS Web Hosting
If you employ one of our virtual private server solutions, any content you upload will be saved on SSD drives that operate in RAID. At least one drive is intended for parity to guarantee the integrity of the data. In simple terms, this is a special drive where information is copied with one bit added to it. In case a disk in the RAID stops functioning, your Internet sites will continue working and when a new disk substitutes the defective one, the bits of the info that will be cloned on it are calculated by using the healthy and the parity drives. That way, any chance of corrupting data throughout the process is prevented. We also use regular hard drives that function in RAID for storing backups, so if you add this service to your VPS package, your content will be kept on multiple drives and you won't ever need to worry about its integrity even in the event of multiple drive failures.