RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that permits a system to employ multiple hard drives as a single logical unit. Simply put, all drives are used as one and the data on all of them is identical. This kind of a configuration has 2 huge advantages over using just a single drive to keep data - the first one is redundancy, so if one drive doesn't work, the info will be accessible from the remaining ones, and the second is better performance as the input/output, or reading/writing operations will be distributed among different drives. There are different RAID types depending on what number of drives are employed, whether reading and writing are both performed from all the drives at the same time, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Based on the particular setup, the error tolerance and the performance may vary.
RAID in Shared Website Hosting
The hard drives that we use for storage with our innovative cloud web hosting platform are not the classic HDDs, but extremely fast solid-state drives (SSD). They operate in RAID-Z - a special setup designed for the ZFS file system that we use. All of the content that you upload to the shared website hosting account will be stored on multiple disk drives and at least 1 shall be employed as a parity disk. This is a specific drive where an extra bit is included to any content copied on it. In case a disk in the RAID stops functioning, it'll be replaced with no service interruptions and the info will be recovered on the new drive by recalculating its bits using the data on the parity disk along with that on the remaining disks. This is done so as to guarantee the integrity of the info and along with the real-time checksum verification that the ZFS file system performs on all drives, you won't ever have to concern yourself with the loss of any info no matter what.
RAID in Semi-dedicated Servers
The RAID type which we use for the cloud hosting platform where your semi-dedicated server account will be created is named RAID-Z. What's different about it is that at least one of the disks is used as a parity drive. Simply put, whenever any data is duplicated on this specific hard drive, one more bit is included to it and in the event that a faulty disk is replaced, the info which will be copied on it is a combination of the data on the other hard disks in the RAID and that on the parity one. This is done to ensure that your info is intact. During this process, your websites will be working normally because RAID-Z makes it possible for an entire drive to fail without any service interruptions and it simply works by using one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system that uses checksums to ensure that no data will get silently corrupted on our servers, you will never need to worry about the integrity of your files.
RAID in VPS Servers
All VPS server accounts which our company offers are made on physical servers that use SSD drives working in RAID. At least one drive is intended for parity - one extra bit is included in the data duplicated on it and if a main disk stops working, this bit makes it simpler to recalculate the bits of the files on the failed drive so that the right info is recovered on the new drive included in the RAID. At the same time, your sites will still be online because all the data will still load from at least one more hard drive. In case you add regular backups to your VPS plan, a copy of your information will be kept on standard hard disks which also work in RAID since we would like to make sure that any type of website content you upload will be safe and sound at all times. Using multiple hard drives in RAID for all of the main and backup servers allows us to offer fast and reliable hosting service.