Redundant Array of Independent Disks, or RAID, is a way of saving content on several hard disks concurrently. A RAID could be software or hardware depending on the hard drives that are used - physical or logical ones, yet what’s common between them is that they all perform as just one single unit where info is stored. The top advantage of using a RAID is redundancy because the info on all of the drives will be the same all of the time, so even in case a drive fails for some reason, the info will still be present on the remaining drives. The general performance is also better because the reading and writing processes could be split between multiple drives, so a single one can't be overloaded. There are different types of RAIDs where the performance and fault tolerance could differ depending on the exact setup - whether info is written on all drives real-time or it is written on one drive and then mirrored on another, the number of drives are used for the RAID, and many others.
RAID in Shared Website Hosting
All content that you upload to your new shared website hosting account will be held on fast SSD drives that function in RAID-Z. This configuration is built to employ the ZFS file system that runs on our cloud hosting platform and it adds another level of security for your website content in addition to the real-time checksum authentication which ZFS uses to ensure the integrity of the data. With RAID-Z, the info is stored on several disks and at least one of them is a parity disk - whenever info is written on it, an additional bit is added, so in the event that any drive fails for whatever 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 never be interrupted and it will continue functioning flawlessly until the problematic drive is changed and the information is synchronized on it.
RAID in Semi-dedicated Hosting
If you host your sites in a semi-dedicated hosting account from our firm, any content which you upload will be saved on SSD drives which operate in RAID-Z. With this type of RAID, at least one of the hard drives is employed for parity - when data is synced between the disks, an additional bit is added to it on the parity one. The idea behind this is to ensure the integrity of the info that is cloned to a brand new drive in case one of the drives in the RAID stops functioning since 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 another one quickly without service interruptions of any sort. RAID-Z adds an additional level of protection for the content which you upload on our cloud hosting platform together with the ZFS file system which uses unique checksums to verify the integrity of each file.
The SSD drives which we use on the physical machines where we generate virtual private servers function in RAID to ensure that any content that you upload will be available and intact at all times. At least a single drive is employed for parity - one bit of information is added to any data copied on it. In the event that a main drive fails, it is changed and the data that will be duplicated on it is calculated between the other drives and the parity one. It's done this way to ensure that the right info is copied and that no file is corrupted since the new drive will be used in the RAID afterwards. We also use hard disk drives operating in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you shall use an even more reliable Internet hosting service as your content will be available on multiple drives irrespective of any sudden hardware failure.