RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which permits a system to take advantage of several hard drives as one single logical unit. To put it differently, all drives are used as one and the info on all of them is identical. This kind of a configuration has 2 key advantages over using a single drive to save data - the first one is redundancy, so in the event that one drive doesn't work, the data will be accessible through the others, and the second one is improved performance because the input/output, or reading/writing operations will be distributed among different drives. There're different RAID types depending on what number of drives are used, if reading and writing are both done from all drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Depending on the exact setup, the fault tolerance and the performance vary.

RAID in Shared Hosting

All the content that you upload to your new shared hosting account will be stored on quick SSD drives that operate in RAID-Z. This configuration is built to work with the ZFS file system that runs on our cloud Internet hosting platform and it adds one more level of security for your site content on top of the real-time checksum verification which ZFS uses to guarantee the integrity of the data. With RAID-Z, the data is saved on a number of disks and at least one of them is a parity disk - whenever information is written on it, an extra bit is added, so in case any drive fails for some reason, the integrity of the data can be verified by recalculating its bits based on what is kept on the production hard drives and on the parity one. With RAID-Z, the functioning of our system will not be interrupted and it will continue functioning smoothly until the malfunctioning drive is replaced and the information is synced on it.

RAID in Semi-dedicated Servers

In case you host your sites within a semi-dedicated server account from our company, all the content that you upload will be saved on SSD drives that work in RAID-Z. With this kind of RAID, at least one of the disks is employed for parity - when data is synchronized between the hard drives, an extra bit is added to it on the parity one. The purpose behind this is to ensure the integrity of the information that is copied to a brand new drive in the event that one of the hard drives in the RAID breaks down because the website content being copied on the brand new disk is recalculated from the data on the standard drives and on the parity one. An additional advantage of RAID-Z is that even if a drive stops working, the system can easily switch to a different one immediately without service disturbances of any type. RAID-Z adds one more level of safety for the content that you upload on our cloud web hosting platform together with the ZFS file system that uses unique checksums as a way to validate the integrity of each file.

RAID in VPS Servers

The SSD drives that we use on the machines where we set up VPS servers function in RAID to make sure that any content which you upload will be available and intact all the time. At least a single drive is used for parity - one bit of info is added to any data copied on it. If a main drive stops working, it is replaced and the info that will be duplicated on it is calculated between the remaining drives and the parity one. This is done to make sure that the needed info is copied and that not a single file is corrupted since the new drive will be used in the RAID afterwards. Also, we use hard drives functioning in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you will use an even more reliable Internet hosting service because your content will be available on multiple drives regardless of any sort of sudden hardware malfunction.