RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to employ a number of hard drives as one single logical unit. Simply put, all the drives are used as one and the info on all of them is identical. This type of a setup has two huge advantages over using just a single drive to save data - the first is redundancy, so in the event that one drive breaks down, the information 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 multiple drives. There are different RAID types depending on what number of drives are employed, if reading and writing are both performed from all the drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etc. Depending on the particular setup, the error tolerance and the performance vary.
RAID in Cloud Website Hosting
All content which you upload to your new cloud website hosting account will be held on fast SSD drives which operate in RAID-Z. This setup is built to use the ZFS file system which runs on our cloud Internet hosting platform and it adds another level of security for your site content on top of the real-time checksum authentication which ZFS uses to ensure the integrity of the data. With RAID-Z, the data is saved on several disks and at least 1 is a parity disk - whenever info is written on it, an additional bit is added, so in case any drive stops working for some reason, the stability of the information can be verified by recalculating its bits in accordance with what is kept on the production hard drives and on the parity one. With RAID-Z, the operation of our system won't be interrupted and it will continue operating effectively until the malfunctioning drive is replaced and the data is synced on it.
RAID in Semi-dedicated Hosting
The RAID type which we use for the cloud hosting platform where your semi-dedicated hosting account will be created is named RAID-Z. What's different about it is that at least 1 of the disks is used as a parity drive. Simply put, whenever any kind of data is cloned on this particular hard drive, one more bit is included to it and if a problematic disk is changed, the info that will be cloned on it is a mix of the data on the other disk drives in the RAID and that on the parity one. It's done this way to ensure that your information is intact. Throughout this process, your Internet sites will be working normally as RAID-Z enables a whole drive to fail without causing any service disruptions and it simply uses one of the other ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to guarantee that no data shall get silently corrupted on our servers, you'll never need to worry about the integrity of your files.
RAID in VPS
The SSD drives that we use on the machines where we create virtual private servers operate in RAID to ensure that any content that you upload will be available and intact all the time. At least 1 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 information that will be duplicated on it is calculated between the rest of the drives and the parity one. This is done to ensure that the right data is copied and that no file is corrupted since the new drive will be included in the RAID afterwards. Also, we use hard drives working in RAID on the backup servers, so if you add this upgrade to your VPS plan, you'll use an even more reliable web hosting service since your content will be available on multiple drives irrespective of any sort of sudden hardware failure.