Redundant Array of Independent Disks, or RAID, is a method of saving content on several hard disk drives at the same time. A RAID might be software or hardware depending on the HDDs that are used - physical or logical ones, still what is common between them is that they all operate as just one single unit where your information is kept. The main advantage of using a RAID is redundancy as the information on all drives is the same all of the time, so even in the event that some drive fails for some reason, the info will still be available on the remaining drives. The general performance is also enhanced as the reading and writing processes could be split between different drives, so a single one won't be overloaded. There're different types of RAIDs where the capabilities and fault tolerance may vary according to the particular setup - whether information is written on all of the drives real-time or it's written on a single drive and afterwards mirrored on another, the number of drives are used for the RAID, etcetera.
RAID in Shared Web Hosting
The disk drives that we use for storage with our revolutionary cloud Internet hosting platform are not the traditional HDDs, but high-speed solid-state drives (SSD). They operate in RAID-Z - a special setup intended for the ZFS file system that we work with. All the content that you add to your shared web hosting account will be held on multiple hard disks and at least 1 will be used as a parity disk. This is a special drive where an extra bit is added to any content copied on it. If a disk in the RAID stops working, it'll be changed without any service disturbances and the data will be rebuilt 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 to ensure the integrity of the information and along with the real-time checksum verification that the ZFS file system performs on all drives, you will never have to worry about losing any information no matter what.
RAID in Semi-dedicated Servers
In case you host your websites in a semi-dedicated server account from our firm, any content which you upload will be held on SSD drives which work in RAID-Z. With this form of RAID, at least 1 of the hard drives is used for parity - when data is synced between the hard drives, an additional bit is included in it on the parity one. The idea behind this is to ensure the integrity of the data which is cloned to a brand new drive in the event that one of the drives in the RAID stops functioning since the site content being copied on the brand new disk is recalculated from the data on the standard drives and on the parity one. An additional advantage of RAID-Z is that even in the event that a drive stops functioning, the system could switch to a different one instantly without service disturbances of any sort. RAID-Z adds one more level of security for the content which you upload on our cloud Internet hosting platform in addition to the ZFS file system that uses unique checksums so as to verify the integrity of each and every file.