Redundant Array of Independent Disks, or RAID, is a way of storing content on multiple hard drives at the same time. A RAID might be software or hardware depending on the HDDs which are used - physical or logical ones, but what is common between them is the fact that they all perform as just a single unit where your information is saved. The key advantage of employing a RAID is redundancy because the data on all drives will be exactly the same all the time, so even in case one of the drives fails for some reason, the data will still be present on the remaining drives. The overall performance will also improve because the reading and writing processes could be split between various drives, so a single one will never be overloaded. There're different sorts of RAIDs where the efficiency and fault tolerance may differ depending on the particular setup - whether info is written on all the drives in real time or it's written on one drive and then mirrored on another, what number of drives are used for the RAID, etcetera.
RAID in Cloud Website Hosting
The drives that we employ for storage with our outstanding cloud Internet hosting platform are not the standard HDDs, but super fast solid-state drives (SSD). They operate in RAID-Z - a special setup created for the ZFS file system which we employ. All of the content that you add to the cloud website hosting account will be saved on multiple hard disks and at least 1 shall be used as a parity disk. This is a specific drive where a further bit is included to any content copied on it. In the event that a disk in the RAID fails, it'll be replaced without service disturbances and the data will be recovered on the new drive by recalculating its bits using the data on the parity disk along with that on the other disks. This is done in order to guarantee the integrity of the information and along with the real-time checksum authentication that the ZFS file system performs on all drives, you will never need to concern yourself with the loss of any info no matter what.
RAID in Semi-dedicated Servers
The info uploaded to any semi-dedicated server account is saved on SSD drives which function in RAID-Z. One of the drives in such a setup is used for parity - any time data is copied on it, an additional bit is added. If a disk happens to be problematic, it will be taken out of the RAID without interrupting the operation of the Internet sites because the data will load from the other drives, and when a brand new drive is included, the information that will be duplicated on it will be a blend between the data on the parity disk and data stored on the other hard disks in the RAID. This is done to ensure that the data that is being cloned is correct, so the moment the new drive is rebuilt, it can be incorporated into the RAID as a production one. This is one more warranty for the integrity of your info since the ZFS file system that runs on our cloud hosting platform compares a special checksum of all the copies of the files on the various drives so as to avoid any possibility of silent data corruption.
RAID in VPS Servers
The physical servers where we make VPS server use extremely fast SSD drives which will boost the speed of your Internet sites considerably. The hard drives operate in RAID to ensure that you won't lose any information because of a power loss or a hardware malfunction. The production servers employ many different drives where the data is stored and one disk is used for parity i.e. one bit is added to all the info copied on it, which makes it much easier to recover the content without any loss if a main drive fails. In case you pick our backup service, your information will be saved on an individual machine that uses standard hard-disk drives and even though there's no parity one in this case, they are also in a RAID to guarantee that we will have a backup copy of your website content all of the time. With this setup your information will always be safe as it will be available on a lot of drives.