RAID, or Redundant Array of Independent Disks, is a technology of storing data on multiple hard disks that operate together as one single logical unit. The drives can be physical or logical i.e. in the second case one drive is divided into separate ones through virtualization software. In any case, the very same information is saved on all the drives and the basic advantage of using this kind of a setup is that if a drive fails, the data will remain available on the remaining ones. Using a RAID also improves the performance since the input and output operations will be spread among a number of drives. There are several types of RAID depending on how many drives are used, whether writing is done on all drives in real time or just on one, and how the information is synchronized between the drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. These factors suggest that the error tolerance as well as the performance between the different RAID types can differ.

RAID in Cloud Hosting

The SSD drives which our cutting-edge cloud hosting platform employs for storage work in RAID-Z. This kind 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 special drive where data stored on the other drives is copied with an extra bit added to it. In case one of the disks stops functioning, your sites shall continue working from the other ones and once we replace the malfunctioning one, the information that will be duplicated on it will be recovered from what is stored on the other drives together with the info from the parity disk. This is done so as to be able to recalculate the bits of every single file correctly and to confirm the integrity of the information duplicated on the new drive. This is one more level of security for the info that you upload to your cloud hosting account along with the ZFS file system that analyzes a special digital fingerprint for each file on all of the hard drives in real time.

RAID in Semi-dedicated Servers

The information uploaded to any semi-dedicated server account is stored on SSD drives that function in RAID-Z. One of the drives in type of a setup is used for parity - any time data is copied on it, an extra bit is added. If a disk happens to be flawed, it will be removed from the RAID without interrupting the work of the websites since the data will load from the rest of the drives, and when a brand new drive is added, the information which will be copied on it will be a mix between the information on the parity disk and data saved on the other hard drives in the RAID. That is done in order to ensure that the information which is being duplicated is correct, so as soon as the new drive is rebuilt, it can be included in the RAID as a production one. This is one more guarantee for the integrity of your info because the ZFS file system that runs on our cloud hosting platform compares a unique checksum of all of 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 that our company provides are generated on physical servers that employ SSD drives functioning in RAID. At least one drive is employed for parity - one additional bit is added to the info cloned on it and in case a main disk stops working, this bit makes it easier to recalculate the bits of the files on the damaged disk drive so that the correct data is restored on the new drive included in the RAID. In the mean time, your Internet sites will still be online since all the info will still load from at least 1 other disk drive. If you add regular backups to your VPS package, a copy of your info will be stored on standard hard drives which also work in RAID as we would like to make certain that any site content you upload will be safe and sound at all times. Employing multiple hard drives in RAID for all the main and backup servers enables us to offer fast and reliable hosting service.