Redundant Array of Independent Disks, or RAID, is a way of storing content on multiple hard drives simultaneously. A RAID can be software or hardware depending on the HDDs that are used - physical or logical ones, but what is common between them is the fact that they all perform as one single unit where data is saved. The main advantage of using a RAID is redundancy as the information on all drives shall be identical all the time, so even in case a drive fails for whatever reason, the information will still be available on the rest of the drives. The general performance will also improve because the reading and writing processes could be split between a number of drives, so a single one won't be overloaded. There are different sorts of RAIDs where the performance and fault tolerance could differ depending on the exact setup - whether your data is written on all the drives real-time or it's written on a single drive and then mirrored on another, the number of drives are used for the RAID, etcetera.

RAID in Shared Web Hosting

The hard drives which we use for storage with our state-of-the-art cloud hosting platform are not the classic HDDs, but super fast solid-state drives (SSD). They work in RAID-Z - a special setup intended for the ZFS file system which we work with. All the content that you upload to your shared web hosting account will be stored on multiple drives and at least one of them will be employed as a parity disk. This is a specific drive where an additional bit is included to any content copied on it. In the event that a disk in the RAID stops working, it'll be changed without service disturbances and the information will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the other disks. This is done to ensure the integrity of the data and along with the real-time checksum verification that the ZFS file system executes on all drives, you'll never need to worry about the loss of any information no matter what.

RAID in Semi-dedicated Servers

In case you host your sites within a semi-dedicated server account from our firm, all of the content you upload will be stored on SSD drives which work in RAID-Z. With this form of RAID, at least 1 of the hard disks is used for parity - when data is synced between the disks, an extra bit is included in it on the parity one. The idea behind this is to ensure the integrity of the information that is cloned to a brand new drive if one of the disks in the RAID stops functioning because the content being copied on the brand new disk is recalculated from the data on the standard disk drives and on the parity one. Another advantage of RAID-Z is the fact that even in case a disk drive fails, the system could switch to another one immediately without service disruptions of any kind. RAID-Z adds an extra level of security for the content which you upload on our cloud web hosting platform in addition to the ZFS file system that uses unique checksums in order to verify the integrity of every single file.

RAID in VPS Servers

The SSD drives which we use on the machines where we generate VPS servers work in RAID to ensure that any content that you upload will be available and intact at all times. At least 1 drive is employed for parity - one bit of data is added to any data cloned on it. In the event that a main drive breaks down, it is replaced and the data which will be copied on it is calculated between the other drives and the parity one. It's done this way to ensure that the right info is copied and that no file is corrupted because the new drive will be used in the RAID afterwards. In addition, we use hard disk drives operating in RAID on the backup servers, so if you add this upgrade to your VPS package, you will use an even more reliable web hosting service because your content will be available on multiple drives regardless of any type of unexpected hardware malfunction.