RAID, or Redundant Array of Independent Disks, is a technology of keeping data on multiple hard disks which function together as one logical unit. The drives can be physical or logical i.e. in the second case one drive is divided into independent ones via virtualization software. In any case, the same info is stored on all drives and the main advantage of using this type of a setup is that in the event that a drive breaks down, the data will remain available on the remaining ones. Having a RAID also improves the performance since the input and output operations will be spread among a number of drives. There are several kinds of RAID depending on how many hard drives are used, whether writing is performed on all of the drives in real time or just on a single one, and how the information is synchronized between the hard drives - whether it's written in blocks on one drive after another or all of it is mirrored from one on the others. All of these factors show that the fault tolerance and the performance between the various RAID types can differ.
RAID in Cloud Web Hosting
The SSD drives that our cutting-edge cloud web hosting platform employs for storage function in RAID-Z. This sort of RAID is intended 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 saved on the other drives is cloned with an additional bit added to it. In case one of the disks fails, your sites will continue working from the other ones and as soon as we replace the bad one, the information that will be duplicated on it will be rebuilt from what is stored on the remaining drives as well as the information from the parity disk. This is performed so as to be able to recalculate the bits of each and every file properly and to confirm the integrity of the info duplicated on the new drive. This is one more level of security for the content you upload to your cloud web hosting account together with the ZFS file system that analyzes a unique digital fingerprint for each file on all hard drives in real time.
RAID in Semi-dedicated Hosting
The SSD drives which are used for storing any content uploaded to the semi-dedicated hosting accounts that we provide operate in RAID-Z. This is a special configuration where one or more disk drives are employed for parity i.e. the system will include an additional bit to any data cloned on this kind of a disk drive. In case that a disk fails and is replaced with a new one, what info will be cloned on the latter will be a mix calculated between the data on the other disks and that on the parity one. This is done to ensure that the info on the new drive will be accurate. Throughout the procedure, the RAID will continue operating normally and the faulty drive will not impact the proper operation of your sites by any means. Working with SSDs in RAID-Z is a superb addition to the ZFS file system that runs on our advanced cloud platform with respect to preserving the integrity of your files because ZFS uses specific digital identifiers identified as checksums so as to avoid silent data corruption.
RAID in VPS Web Hosting
All virtual private server accounts that we provide are created on physical servers which take advantage of SSD drives operating in RAID. At least one drive is employed for parity - one extra bit is included in the data cloned on it and in case a main disk stops working, this bit makes it much easier to recalculate the bits of the files on the failed disk drive so that the correct data is restored on the new drive added to the RAID. Meanwhile, your websites will still be online since all the info will still load from at least 1 other disk drive. In the event that you add routine backups to your VPS plan, a copy of the info will be saved on standard hard drives which also function in RAID since we would like to make sure that any kind of website content you upload will be safe and sound all of the time. Employing multiple hard drives in RAID for all of the main and backup servers permits us to offer fast and reliable hosting service.