RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that makes it possible for a system to employ multiple hard drives as a single logical unit. Put simply, all the drives are used as one and the info on all of them is identical. This kind of a setup has two key advantages over using just a single drive to store data - the first one is redundancy, so in the event that one drive breaks down, the info will be accessible through the remaining ones, and the second is improved performance since the input/output, or reading/writing operations will be distributed among several drives. There are different RAID types in accordance with what number of drives are used, if reading and writing are both performed from all the drives simultaneously, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. According to the exact setup, the error tolerance and the performance could differ.
RAID in Cloud Hosting
Our state-of-the-art cloud Internet hosting platform where all cloud hosting accounts are created employs quick SSD drives rather than the traditional HDDs, and they work in RAID-Z. With this configuration, a number of hard drives operate together and at least one is a dedicated parity disk. Put simply, when data is written on the remaining drives, it is duplicated on the parity one adding an extra bit. This is carried out for redundancy as even if some drive fails or falls out of the RAID for some reason, the info can be rebuilt and verified using the parity disk and the data recorded on the other ones, so nothing will be lost and there will be no service disturbances. This is one more level of security for your data in addition to the top-notch ZFS file system which uses checksums to make sure that all the data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Servers
The info uploaded to any semi-dedicated server account is kept on SSD drives that work in RAID-Z. One of the drives in this kind of a setup is used for parity - every time data is cloned on it, an additional bit is added. If a disk turns out to be flawed, it will be removed from the RAID without interrupting the work of the sites since the data will load from the other drives, and when a new drive is included, the info which will be cloned on it will be a mix between the info on the parity disk and data saved on the other hard disks in the RAID. That is done to ensure that the information which is being duplicated is accurate, so once the new drive is rebuilt, it can be incorporated into the RAID as a production one. This is one more guarantee for the integrity of your data since the ZFS file system which runs on our cloud Internet hosting platform analyzes a special checksum of all the copies of the files on the different drives to be able to avoid any possibility of silent data corruption.
RAID in VPS Servers
All VPS server accounts which we provide are made on physical servers which use SSD drives operating in RAID. At least one drive is employed for parity - one extra bit is added to the data cloned on it and in case a main disk breaks down, this bit makes it much simpler to recalculate the bits of the files on the damaged hard disk so that the correct data is recovered on the new drive added to the RAID. At the same time, your sites will remain online as all the data will still load from at least 1 other disk drive. If you add regular backups to your VPS package, a copy of your data will be stored on standard hard drives which also operate in RAID as we want to make certain that any kind of content you add will be protected all of the time. Working with multiple hard drives in RAID for all main and backup servers allows us to offer fast and reliable web hosting service.