RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that allows a system to use multiple hard drives as one single logical unit. Put simply, all the drives are used as one and the info on all of them is the same. Such a configuration has 2 huge advantages over using just a single drive to keep data - the first one is redundancy, so in case one drive fails, the data will be accessible from the others, and the second is better performance because the input/output, or reading/writing operations will be distributed among a number of drives. There are different RAID types in accordance with the number of drives are used, if reading and writing are both handled from all of the drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. According to the particular setup, the fault tolerance and the performance could differ.
RAID in Website Hosting
All of the content which you upload to your new website hosting account will be stored on quick SSD drives which function in RAID-Z. This configuration is built to work with the ZFS file system which runs on our cloud web hosting platform and it adds one more level of security for your content on top of the real-time checksum authentication which ZFS uses to guarantee the integrity of the data. With RAID-Z, the information is saved on a couple of disks and at least one of them is a parity disk - whenever information is recorded on it, an additional bit is added, so in case any drive stops working for some reason, the integrity of the info can be verified by recalculating its bits based on what is stored on the production drives and on the parity one. With RAID-Z, the functioning of our system will not be interrupted and it'll continue operating effectively until the malfunctioning drive is replaced and the info is synced on it.
RAID in Semi-dedicated Hosting
In case you host your sites in a semi-dedicated hosting account from our company, all of the content which you upload will be held on SSD drives which work in RAID-Z. With this form of RAID, at least one of the hard drives is employed for parity - when data is synchronized between the disks, an additional bit is added to it on the parity one. The purpose behind this is to guarantee the integrity of the information that is duplicated to a brand new drive in the event that one of the disks in the RAID stops working because 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 if a disk drive stops working, the system could switch to a different one instantly without service disruptions of any sort. RAID-Z adds an additional level of security for the content which you upload on our cloud hosting platform together with the ZFS file system which uses unique checksums in order to validate the integrity of every single file.
RAID in VPS Hosting
The SSD drives which we use on the machines where we create virtual private servers operate in RAID to ensure that any content you upload will be available and intact all the time. At least a single drive is employed for parity - one bit of data is added to any data copied on it. In the event that a main drive breaks down, it is replaced and the info which will be cloned on it is calculated between the remaining drives and the parity one. This is done to make sure that the required data is copied and that no file is corrupted as the new drive will be included in the RAID afterwards. Also, we use hard disk drives functioning in RAID on the backup servers, so if you add this upgrade to your VPS plan, you will use an even more reliable Internet hosting service as your content will be available on multiple drives irrespective of any sudden hardware failure.