Redundant Array of Independent Disks, or RAID, is a method of keeping content on a number of hard drives concurrently. A RAID could 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 just one single unit where information is stored. The main advantage of using a RAID is redundancy because the info on all of the drives shall be the same all of the time, so even in case some drive fails for whatever reason, the info will still be available on the remaining drives. The general performance will also improve as the reading and writing processes can be split between a number of drives, so a single one won't be overloaded. There are different kinds of RAIDs where the effectiveness and fault tolerance can vary depending on the specific setup - whether data is written on all of the drives in real time or it is written on a single drive and then mirrored on another, the number of drives are used for the RAID, etc.
RAID in Cloud Web Hosting
All content that you upload to your new cloud web hosting account will be saved on quick SSD drives which work in RAID-Z. This configuration is built to use the ZFS file system that runs on our cloud web hosting platform and it adds another level of security for your content in addition to the real-time checksum verification that ZFS uses to guarantee the integrity of the data. With RAID-Z, the data is saved on a couple of disks and at least 1 is a parity disk - whenever data is recorded on it, an extra bit is added, so in the event that any drive stops functioning for whatever reason, the integrity of the info can be verified by recalculating its bits based on what is kept on the production hard drives and on the parity one. With RAID-Z, the functioning of our system won't be interrupted and it will continue operating flawlessly until the problematic drive is replaced and the info is synchronized on it.
RAID in Semi-dedicated Servers
The RAID type which we use for the cloud web hosting platform where your semi-dedicated server account shall be created is named RAID-Z. What's different about it is that at least one of the disks is employed as a parity drive. In simple terms, whenever any data is duplicated on this specific drive, one more bit is included to it and in case a problematic disk is replaced, the information that will be copied on it is a combination of the data on the remaining hard drives in the RAID and that on the parity one. This is done to make sure that the data is intact. During this process, your websites will be working normally since RAID-Z makes it possible for an entire drive to fail without service disruptions and it simply works by using one of the remaining ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to ensure that no data will get silently corrupted on our servers, you'll never have to worry about the integrity of your files.
RAID in VPS Servers
The physical servers where we generate VPS server work with fast SSD drives which will boost the speed of your Internet sites considerably. The disk drives operate in RAID to guarantee that you won't lose any data because of a power loss or a hardware failure. The production servers work with multiple drives where the data is saved and one disk is used for parity i.e. one bit is added to all the info copied on it, which makes it much easier to restore the content without loss in the event a main drive breaks down. In case you use our backup service, your info will be kept on a separate machine which uses standard hard-disk drives and despite the fact that there is no parity one in this case, they are also in a RAID to guarantee that we will have a backup of your website content at all times. With this kind of configuration your information will always be safe as it will be available on multiple drives.