RAID, or Redundant Array of Independent Disks, is a technology for saving data on a number hard disk drives which work together as one single logical unit. The drives can be physical or logical i.e. in the second case one single drive is divided into separate ones via virtualization software. In either case, the very same info is saved on all drives and the key advantage of using such a setup is that in the event that a drive breaks down, the data shall still be available on the remaining ones. Employing a RAID also enhances the overall performance since the input and output operations will be spread among a few drives. There are several types of RAID dependant upon how many hard disks are used, whether writing is performed on all the drives in real time or just on one, and how the info is synchronized between the hard drives - whether it is recorded in blocks on one drive after another or all of it is mirrored from one on the others. All these factors mean that the error tolerance as well as the performance between the various RAID types can vary.
RAID in Hosting
The SSD drives which our cutting-edge cloud web hosting platform employs for storage function in RAID-Z. This sort of RAID is created to work with the ZFS file system that runs on the platform and it uses the so-called parity disk - a specific drive where data located on the other drives is copied with an additional bit added to it. In the event that one of the disks stops functioning, your sites will continue working from the other ones and as soon as we replace the malfunctioning one, the information which will be duplicated on it will be rebuilt from what is stored on the rest of the drives as well as the information from the parity disk. This is done so as to be able to recalculate the elements of every file correctly and to confirm the integrity of the information cloned on the new drive. This is an additional level of security for the content that you upload to your hosting account together with the ZFS file system which analyzes a unique digital fingerprint for each and every file on all hard drives in real time.
RAID in Semi-dedicated Servers
In case you host your websites within a semi-dedicated server account from our firm, all of the content that you upload will be kept on SSD drives that work in RAID-Z. With this form of RAID, at least one of the drives is used for parity - when data is synchronized between the disks, an additional bit is included in it on the parity one. The purpose behind this is to ensure the integrity of the data which is duplicated to a brand new drive if one of the drives in the RAID stops functioning since the site content being copied on the brand new disk is recalculated from the information on the standard disk drives and on the parity one. An additional advantage of RAID-Z is the fact that even if a disk drive stops functioning, the system can easily switch to another one quickly without service disturbances of any sort. RAID-Z adds an extra level of security for the content that you upload on our cloud web hosting platform together with the ZFS file system which uses unique checksums so as to validate the integrity of each file.
RAID in VPS Servers
The SSD drives which we use on the physical machines where we create VPS servers function in RAID to ensure that any content you upload will be available and intact all of the time. At least 1 drive is used 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 information that will be duplicated on it is calculated between the other drives and the parity one. This is done to ensure that the right data is copied and that not a single file is corrupted because the new drive will be included in the RAID afterwards. In addition, we use hard disk drives working in RAID on the backup servers, so in case you add this upgrade to your VPS plan, you will use an even more reliable web hosting service as your content will be available on multiple drives regardless of any sort of sudden hardware failure.