Redundant Array of Independent Disks, or RAID, is a method of keeping content on a number of hard drives simultaneously. A RAID can be software or hardware based on the HDDs that are used - physical or logical ones, yet what is common between them is the fact that they all perform as just a single unit where information is saved. The top advantage of using a RAID is redundancy since the information on all drives shall be the same at all times, so even in the event that one of the drives fails for some reason, the information will still be present on the remaining drives. The general performance will also improve since the reading and writing processes can be split between multiple drives, so a single one will never be overloaded. There are different kinds of RAIDs where the effectiveness and fault tolerance may differ depending on the particular setup - whether data is written on all drives real-time or it is written on a single drive and after that mirrored on another, what number of drives are used for the RAID, and so on.
RAID in Shared Hosting
The SSD drives which our cutting-edge cloud web hosting platform employs for storage work in RAID-Z. This type of RAID is created to work with the ZFS file system that runs on the platform and it works by using the so-called parity disk - a special drive where information stored on the other drives is copied with an additional bit added to it. In the event that one of the disks stops working, your sites shall continue working from the other ones and as soon as we replace the malfunctioning one, the info which will be duplicated on it will be rebuilt from what is stored on the remaining drives together with the data from the parity disk. This is performed so as to be able to recalculate the bits of every single file correctly and to verify the integrity of the information cloned on the new drive. This is another level of security for the content which you upload to your shared hosting account together with the ZFS file system which compares a special digital fingerprint for every single file on all the hard drives in real time.
RAID in Semi-dedicated Servers
The SSD drives which are used for storing any content uploaded to the semi-dedicated server accounts which we offer operate in RAID-Z. This is a special setup where one or more hard drives are used for parity i.e. the system will add an additional bit to any data cloned on this type of a hard drive. In the event that a disk fails and is substituted with another one, what data will be cloned on the latter shall be a mix calculated between the data on the remaining disks and that on the parity one. This is done to ensure that the info on the new drive will be correct. Throughout the process, the RAID will continue working normally and the problematic drive won't affect the adequate operation of your Internet sites at all. Using SSDs in RAID-Z is a fantastic addition to the ZFS file system which runs on our top-notch cloud platform in terms of preserving the integrity of your files as ZFS uses specific digital identifiers identified as checksums so as to prevent silent data corruption.
RAID in VPS Servers
The SSD drives which we use on the machines where we generate VPS servers operate in RAID to make sure that any content you upload will be available and intact all of the time. At least a single drive is employed for parity - one bit of data is added to any data copied on it. In case a main drive stops working, it is replaced and the information that will be copied on it is calculated between the other drives and the parity one. This is done to make sure that the required info is copied and that no file is corrupted since the new drive will be incorporated into the RAID afterwards. We also use hard disk drives working in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you shall use an even more reliable Internet hosting service as your content will be available on multiple drives irrespective of any sort of sudden hardware failure.