RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to use multiple hard drives as a single logical unit. To put it differently, all the drives are used as one and the information on all of them is identical. Such a setup has 2 key advantages over using a single drive to save data - the first one is redundancy, so in case one drive stops working, the data will be accessed from the others, and the second one is improved performance because the input/output, or reading/writing operations will be spread among multiple drives. You can find different RAID types based on the number of drives are employed, if reading and writing are both performed from all the drives simultaneously, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Determined by the particular setup, the error tolerance and the performance may differ.

RAID in Web Hosting

The disk drives which we use for storage with our state-of-the-art cloud web hosting platform are not the standard HDDs, but extremely fast solid-state drives (SSD). They work in RAID-Z - a special setup designed for the ZFS file system which we employ. Any content that you upload to the web hosting account will be saved on multiple drives and at least 1 shall be used as a parity disk. This is a special drive where an additional bit is added to any content copied on it. In case a disk in the RAID stops working, it will be replaced without service disruptions and the data will be recovered on the new drive by recalculating its bits using the data on the parity disk plus that on the other disks. This is done 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 have to concern yourself with losing any information no matter what.

RAID in Semi-dedicated Servers

The information uploaded to any semi-dedicated server account is saved on SSD drives which function in RAID-Z. One of the drives in this kind of a configuration is used for parity - any time data is cloned on it, an additional bit is added. If a disk turns out to be faulty, it will be removed from the RAID without interrupting the functioning of the sites as the data will load from the remaining drives, and when a new drive is included, the data which will be copied on it will be a combination between the info on the parity disk and data saved on the other hard drives in the RAID. This is done so as to guarantee that the information which is being copied is accurate, so as soon as the new drive is rebuilt, it can be included in 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 web hosting platform analyzes a special checksum of all copies of the files on the separate drives to be able to avoid any chance of silent data corruption.

RAID in VPS Servers

The physical servers where we make VPS server work with fast SSD drives that will increase the speed of your sites substantially. The hard disks function in RAID to make sure that you won't lose any data because of a power loss or a hardware malfunction. The production servers use many different drives where the information is saved and one disk is used for parity i.e. one bit is added to all the info copied on it, that makes it much easier to recover the content without any loss in the event a main drive breaks down. In case you take advantage of our backup service, the info will be stored on an independent machine that uses standard hard-disk drives and despite the fact that there is no parity one in this case, they are also in a RAID to make sure that we will have a backup of your site content all of the time. With this type of configuration your data will always be safe because it will be available on a lot of drives.