RAID, or Redundant Array of Independent Disks, is a technology of storing data on a number hard drives that operate together as a single logical unit. The drives can be physical or logical i.e. in the second case one single drive is split into different ones via virtualization software. In any case, the very same information is saved on all drives and the key advantage of using such a setup is that in case a drive stops working, the data will still be available on the other ones. Using a RAID also enhances the performance as the input and output operations will be spread among several drives. There are several kinds 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 synced between the drives - whether it is written in blocks on one drive after another or it is mirrored from one on the others. All these factors imply that the fault tolerance as well as the performance between the various RAID types may vary.
RAID in Shared Website Hosting
The SSD drives that our cutting-edge cloud Internet hosting platform uses for storage operate in RAID-Z. This kind of RAID is intended to work with the ZFS file system which runs on the platform and it works by using the so-called parity disk - a special drive where information located on the other drives is duplicated with an extra bit added to it. In the event that one of the disks fails, your Internet sites will continue working from the other ones and as soon as we replace the bad one, the info which will be duplicated on it will be recovered from what is stored on the remaining drives together with the data from the parity disk. This is performed in order to be able to recalculate the bits of every single file properly and to verify the integrity of the info cloned on the new drive. This is an additional level of security for the content which you upload to your shared website hosting account together with the ZFS file system that compares a unique digital fingerprint for every single file on all the hard drives in real time.
RAID in Semi-dedicated Hosting
If you host your websites in a semi-dedicated hosting account from our company, all the content which you upload will be kept on SSD drives which operate in RAID-Z. With this type of RAID, at least one of the hard disks is employed for parity - when data is synced between the hard drives, an extra bit is included in it on the parity one. The idea behind this is to ensure the integrity of the data that is cloned to a brand new drive in the event that one of the hard drives in the RAID fails since 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 the fact that even in the event that a disk drive stops functioning, the system can switch to a different one right away without service disruptions of any kind. RAID-Z adds one more level of protection for the content which you upload on our cloud Internet hosting platform in addition to the ZFS file system which uses unique checksums so as to validate the integrity of every single file.
RAID in VPS Hosting
In case you take advantage of one of our virtual private server solutions, any content which you upload will be saved on SSD drives which work in RAID. At least a single drive is used for parity so as to ensure the integrity of the data. In simple terms, this is a special drive where information is copied with one bit added to it. If a disk from the RAID stops functioning, your websites will continue working and when a new disk substitutes the faulty one, the bits of the information that will be copied on it are calculated using the healthy and the parity drives. By doing this, any potential for corrupting data during the process is avoided. We also use ordinary hard disk drives which function in RAID for storing backup copies, so in case you include this service to your VPS plan, your site content will be stored on multiple drives and you'll never have to worry about its integrity even in the event of multiple drive breakdowns.