Redundant Array of Independent Disks, or RAID, is a way of keeping content on multiple hard disk drives concurrently. A RAID can be software or hardware depending on the drives which are used - physical or logical ones, but what is common between them is that they all work as a single unit where your information is kept. The top advantage of using a RAID is redundancy since the info on all of the drives is exactly the same all the time, so even in the event that some drive fails for whatever reason, the information will still be available on the other drives. The general performance is also better since the reading and writing processes can be split between a number of drives, so a single one will never be overloaded. There're different sorts of RAIDs where the capabilities and fault tolerance can vary depending on the particular setup - whether your data is written on all drives in real time or it is written on a single drive and afterwards mirrored on another, what number of drives are used for the RAID, and many others.

RAID in Cloud Website Hosting

The drives that we employ for storage with our outstanding cloud web hosting platform are not the traditional HDDs, but high-speed solid-state drives (SSD). They function in RAID-Z - a special setup created for the ZFS file system which we use. All the content that you upload to the cloud website hosting account will be stored on multiple drives and at least one of them shall be used as a parity disk. This is a special drive where an extra bit is included to any content copied on it. In case a disk in the RAID stops functioning, it will be changed without any service disturbances and the information will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the remaining disks. This is done so as to guarantee the integrity of the information and along with the real-time checksum verification which the ZFS file system performs on all drives, you'll never need to concern yourself with losing any data no matter what.

RAID in Semi-dedicated Servers

The info uploaded to any semi-dedicated server account is saved on SSD drives that operate in RAID-Z. One of the drives in such a configuration is used for parity - whenever data is copied on it, an extra bit is added. If a disk happens to be defective, it will be taken out of the RAID without disturbing the functioning of the Internet sites since the data will load from the remaining drives, and when a brand new drive is added, the information which will be copied on it will be a blend between the data on the parity disk and data kept on the other hard drives in the RAID. That is done so as to ensure that the data which is being duplicated is accurate, so once the new drive is rebuilt, it could be incorporated into the RAID as a production one. This is an additional guarantee for the integrity of your info since the ZFS file system that runs on our cloud hosting platform analyzes a unique checksum of all the copies of the files on the different drives to avoid any chance of silent data corruption.

RAID in VPS Servers

The SSD drives which we use on the machines where we create VPS servers operate in RAID to ensure that any content you upload will be available and intact all the time. At least one drive is employed for parity - one bit of info is added to any data cloned on it. If a main drive breaks down, it is replaced and the information that will be duplicated on it is calculated between the remaining drives and the parity one. This is done to ensure that the correct info is copied and that no file is corrupted because the new drive will be included in the RAID afterwards. Also, we use hard disk drives functioning in RAID on the backup servers, so if you add this upgrade to your VPS plan, you shall use an even more reliable Internet hosting service because your content will be available on multiple drives regardless of any unpredicted hardware malfunction.