RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which makes it possible for a system to employ a number of hard drives as a single logical unit. In other words, all the drives are used as one and the data on all of them is the same. This kind of a configuration has 2 major advantages over using a single drive to save data - the first is redundancy, so in case one drive stops working, the information will be accessed from the others, and the second is improved performance because the input/output, or reading/writing operations will be spread among different drives. There're different RAID types based on what amount of drives are employed, whether reading and writing are both executed from all drives simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. Based on the exact setup, the error tolerance and the performance may vary.
RAID in Hosting
All the content that you upload to your new hosting account will be stored on quick SSD drives that operate in RAID-Z. This configuration is built to use the ZFS file system that runs on our cloud Internet hosting platform and it adds one more level of security for your website content in addition to the real-time checksum authentication that ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is stored on a couple of disks and at least one of them is a parity disk - whenever data is written on it, an additional bit is added, so in case any drive stops functioning for some reason, the stability of the info can be verified by recalculating its bits based on what is kept 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 functioning effectively until the malfunctioning drive is changed and the info is synced on it.
RAID in Semi-dedicated Servers
The SSD drives that are used for keeping any site content uploaded to the semi-dedicated server accounts that we offer work in RAID-Z. This is a special setup where one or more disk drives are employed for parity i.e. the system will add an extra bit to any data cloned on such a disk drive. In the event that a disk fails and is replaced with another one, what information will be cloned on the latter will be a mix calculated between the data on the remaining drives and that on the parity one. This is done to guarantee that the information on the new drive shall be correct. During the procedure, the RAID will continue operating normally and the problematic drive won't impact the adequate operation of your sites in any respect. Working with SSDs in RAID-Z is a fantastic addition to the ZFS file system which runs on our revolutionary cloud platform with respect to preserving the integrity of your files because ZFS uses unique digital identifiers named checksums so as to prevent silent data corruption.
RAID in VPS Servers
The SSD drives which we use on the physical machines where we generate VPS servers operate in RAID to ensure that any content that you upload will be available and intact all the time. At least one drive is used for parity - one bit of data is added to any data copied on it. In case a main drive fails, it is changed and the data that will be cloned on it is calculated between the other drives and the parity one. It's done this way to make sure that the required information is copied and that no file is corrupted as the new drive will be included in the RAID afterwards. Also, we use hard disks functioning in RAID on the backup servers, so in case you add this upgrade to your VPS package, you'll use an even more reliable Internet hosting service as your content will be available on multiple drives irrespective of any kind of unexpected hardware malfunction.