RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that allows a system to employ many hard drives as a single logical unit. Put simply, all of the drives are used as one and the info on all of them is the same. Such a configuration has two major advantages over using just a single drive to store data - the first one is redundancy, so in case one drive stops working, the information will be accessible through the others, and the second is improved performance as the input/output, or reading/writing operations will be distributed among different drives. There are different RAID types depending on what number of drives are used, if reading and writing are both handled 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, etc. Based on the particular setup, the error tolerance and the performance may vary.
RAID in Web Hosting
The SSD drives which our cutting-edge cloud hosting platform employs for storage operate in RAID-Z. This type of RAID is created to work with the ZFS file system which runs on the platform and it employs the so-called parity disk - a specific drive where info stored on the other drives is duplicated with an additional bit added to it. In the event that one of the disks stops working, your Internet sites will continue working from the other ones and as soon as we replace the malfunctioning one, the data that will be copied on it will be rebuilt from what is stored on the remaining drives as well as the info from the parity disk. This is done so as to be able to recalculate the bits of every file adequately and to verify the integrity of the info duplicated on the new drive. This is one more level of security for the content which you upload to your web hosting account in addition to the ZFS file system which analyzes a special digital fingerprint for each and every file on all the hard drives in real time.
RAID in Semi-dedicated Hosting
In case you host your sites inside a semi-dedicated hosting account from our firm, any content which you upload will be stored on SSD drives that work in RAID-Z. With this type of RAID, at least one of the drives is employed for parity - when data is synced between the hard drives, an extra bit is added to it on the parity one. The purpose behind this is to guarantee the integrity of the data which is duplicated to a brand new drive in case one of the drives in the RAID breaks down as the site content being copied on the brand new disk is recalculated from the information on the standard drives and on the parity one. An additional advantage of RAID-Z is that even in the event that a disk drive fails, the system can easily switch to a different one immediately without service interruptions of any sort. RAID-Z adds an extra level of protection for the content you upload on our cloud hosting platform together with the ZFS file system that uses unique checksums as a way to verify the integrity of every single file.
RAID in VPS Web Hosting
The SSD drives which we use on the physical machines where we create virtual private servers operate in RAID to make sure that any content you upload will be available and intact at all times. At least one drive is used for parity - one bit of information is added to any data copied on it. If a main drive stops working, it is replaced and the info which will be duplicated on it is calculated between the rest of the drives and the parity one. It's done this way to ensure that the needed info is copied and that not a single file is corrupted as the new drive will be included in the RAID afterwards. We also use hard drives working in RAID on the backup servers, so in case you add this upgrade to your VPS plan, you'll use an even more reliable hosting service since your content will be available on multiple drives irrespective of any sudden hardware failure.