RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which makes it possible for a system to employ several hard drives as a single logical unit. Put simply, all the drives are used as one and the data on all of them is identical. This type of a setup has two huge advantages over using a single drive to save data - the first is redundancy, so in case one drive fails, the info will be accessible through the others, and the second one is better performance as the input/output, or reading/writing operations will be spread among a number of drives. There're different RAID types in accordance with what amount of drives are employed, whether reading and writing are both handled from all the drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Based on the particular setup, the error tolerance and the performance may differ.
RAID in Cloud Hosting
The hard drives which we employ for storage with our innovative cloud Internet hosting platform are not the classic HDDs, but extremely fast solid-state drives (SSD). They function in RAID-Z - a special setup created for the ZFS file system which we work with. Any content that you add to the cloud hosting account will be stored on multiple drives and at least 1 shall be employed as a parity disk. This is a specific drive where an extra bit is included to any content copied on it. If a disk in the RAID stops working, it will be replaced without any service disruptions and the info will be recovered on the new drive by recalculating its bits using the data on the parity disk along with that on the remaining disks. This is done in order to ensure the integrity of the information and together with the real-time checksum authentication which the ZFS file system executes on all drives, you won't ever need to concern yourself with losing any information no matter what.
RAID in Semi-dedicated Servers
The RAID type that we use for the cloud web hosting platform where your semi-dedicated server account shall be created is referred to as RAID-Z. What's different about it is that at least one of the disks is employed as a parity drive. Put simply, whenever any data is copied on this specific drive, one more bit is included to it and in case a faulty disk is changed, the information which will be copied on it is a mix of the data on the remaining hard drives in the RAID and that on the parity one. We do this to ensure that your data is intact. Throughout this process, your Internet sites will be working normally since RAID-Z makes it possible for a whole drive to fail without service disturbances and it simply uses one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to ensure that no data will get silently corrupted on our servers, you will never have to worry about the integrity of your files.
RAID in VPS Servers
If you use one of our VPS server plans, any content that you upload will be saved on SSD drives which work in RAID. At least 1 drive is used for parity so as to guarantee the integrity of your info. In simple terms, this is a special drive where information is copied with one bit added to it. If a disk from the RAID fails, your websites will continue working and when a new disk replaces the malfunctioning one, the bits of the info that will be duplicated on it are calculated by using the healthy and the parity drives. By doing this, any probability of corrupting data during the process is avoided. We also employ ordinary hard drives that operate in RAID for storing backup copies, so in case you add this service to your VPS plan, your site content will be saved on multiple drives and you'll never have to worry about its integrity even in the event of multiple drive failures.