RAID, or Redundant Array of Independent Disks, is a technology for storing data on several hard disk drives which operate together as a single logical unit. The drives could be physical or logical i.e. in the aforementioned case one drive is divided into independent ones via virtualization software. Either way, the very same data is stored on all of the drives and the basic advantage of using this type of a setup is that in case a drive stops working, the data will still be available on the remaining ones. Employing a RAID also improves the performance as the input and output operations will be spread among several drives. There are several types of RAID based on how many hard drives are used, whether writing is performed on all the drives in real time or just on a single one, and how the information is synced between the hard drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. These factors indicate that the error tolerance and the performance between the different RAID types may differ.
RAID in Hosting
The disk drives that we employ for storage with our outstanding cloud Internet hosting platform are not the traditional HDDs, but quick solid-state drives (SSD). They work in RAID-Z - a special setup designed for the ZFS file system which we work with. All the content that you add to your hosting account will be held on multiple disk 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'll be replaced without any service interruptions and the information will be rebuilt on the new drive by recalculating its bits using the data on the parity disk plus that on the remaining disks. This is done to ensure the integrity of the data and together with the real-time checksum validation which the ZFS file system executes on all drives, you will never have to concern yourself with losing any data no matter what.
RAID in Semi-dedicated Servers
In case you host your sites inside a semi-dedicated server account from our firm, all the content you upload will be stored on SSD drives that work in RAID-Z. With this type of RAID, at least 1 of the disks is used for parity - when data is synchronized between the disks, an additional bit is included in it on the parity one. The idea behind this is to ensure the integrity of the info which is duplicated to a brand new drive if one of the drives in the RAID breaks down because the website content being copied on the brand new disk is recalculated from the information on the standard hard drives and on the parity one. An additional advantage of RAID-Z is the fact that even if a disk drive stops functioning, the system could switch to a different one right away without service interruptions of any type. RAID-Z adds an additional level of safety for the content you upload on our cloud hosting platform in addition to the ZFS file system which uses unique checksums to validate the integrity of each and every file.
RAID in VPS Servers
If you take advantage of one of our VPS server plans, any content that you upload will be saved on SSD drives which work in RAID. At least one drive is intended for parity so as to guarantee the integrity of the data. In simple terms, this is a special drive where data is copied with one bit added to it. In case a disk inside the RAID stops working, your Internet sites will continue working and when a new disk substitutes the faulty one, the bits of the info that will be cloned on it are calculated by using the healthy and the parity drives. This way, any possibility of corrupting data during the process is prevented. We also employ standard hard disk drives that function in RAID for storing backup copies, so should you add this service to your VPS package, your website content will be saved on multiple drives and you'll never need to worry about its integrity even in the event of multiple drive breakdowns.