RAID, or Redundant Array of Independent Disks, is a technology for storing data on multiple hard disks which function together as one single logical unit. The drives can be physical or logical i.e. in the second case one single drive is divided into different ones via virtualization software. Either way, the same information is saved on all of the drives and the basic advantage of using this type of a setup is that in case a drive breaks down, the data will still be available on the remaining ones. Employing a RAID also improves the overall performance as the input and output operations will be spread among a few drives. There are several kinds of RAID dependant upon how many hard disks are used, whether writing is done on all of the drives in real time or just on a single one, and how the info is synchronized between the drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. These factors show that the error tolerance and the performance between the various RAID types can differ.
RAID in Shared Web Hosting
Our advanced cloud Internet hosting platform where all shared web hosting accounts are created employs fast SSD drives instead of the classic HDDs, and they work in RAID-Z. With this configuration, multiple hard disk drives work together and at least one of them is a dedicated parity disk. In simple terms, when data is written on the other drives, it's copied on the parity one adding an extra bit. This is carried out for redundancy as even if a drive fails or falls out of the RAID for some reason, the data can be rebuilt and verified thanks to the parity disk and the data recorded on the other ones, which means that not a single thing will be lost and there will be no service disturbances. This is one more level of security for your information in addition to the state-of-the-art ZFS file system that uses checksums to guarantee that all data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Servers
The SSD drives that are used for holding any site content uploaded to the semi-dedicated server accounts which we provide work in RAID-Z. This is a specific setup where one or more hard drives are used for parity i.e. the system will include an extra bit to any data duplicated on this kind of a disk drive. If a disk fails and is replaced with a new one, what data will be copied on the latter shall be a mix calculated between the data on the remaining drives and that on the parity one. This is done to guarantee that the info on the new drive shall be accurate. During the procedure, the RAID will continue functioning normally and the malfunctioning drive won't have an impact on the proper operation of your sites in any way. Using SSDs in RAID-Z is an amazing addition to the ZFS file system that runs on our cutting-edge cloud platform with respect to preserving the integrity of your files since ZFS uses specific digital identifiers named checksums in order to prevent silent data corruption.
RAID in VPS Servers
All VPS server accounts which we provide are generated on physical servers which take advantage of SSD drives operating in RAID. At least one drive is intended for parity - one extra bit is added to the info cloned on it and in case a main disk breaks down, this bit makes it much easier to recalculate the bits of the files on the failed drive so that the right information is restored on the new drive added to the RAID. In the mean time, your websites will stay online as all the info will still load from at least 1 other drive. In case you add routine backups to your VPS package, a copy of your info will be kept on standard disk drives that also operate in RAID because we would like to make sure that any sort of content you add will be risk-free all of the time. Using multiple hard drives in RAID for all of the main and backup servers allows us to offer fast and reliable hosting service.