Redundant Array of Independent Disks, or RAID, is a method of saving content on several hard drives at the same time. A RAID could be software or hardware based on the HDDs that are used - physical or logical ones, however what’s common between them is the fact that they all operate as one single unit where your information is saved. The biggest advantage of using a RAID is redundancy because the info on all drives will be the same all of the time, so even in case one of the drives fails for whatever reason, the information will still be present on the remaining drives. The overall performance will also improve since the reading and writing processes could be split between multiple drives, so a single one won't be overloaded. There're different kinds of RAIDs where the performance and fault tolerance could differ based on the exact setup - whether information is written on all of the drives real-time or it's written on a single drive and after that mirrored on another, the number of drives are used for the RAID, etcetera.
RAID in Shared Hosting
The disk drives that we use for storage with our outstanding cloud hosting platform are not the classic HDDs, but extremely fast solid-state drives (SSD). They work in RAID-Z - a special setup created for the ZFS file system which we employ. All the content that you upload to the shared hosting
account will be saved on multiple disk drives and at least one of them will be employed as a parity disk. This is a specific drive where a further bit is included to any content copied on it. In case a disk in the RAID stops functioning, it'll be replaced without any service disturbances and the information will be recovered on the new drive by recalculating its bits using the data on the parity disk plus that on the remaining disks. This is done to ensure the integrity of the information and together with the real-time checksum validation that the ZFS file system runs on all drives, you will never need to concern yourself with the loss of any info no matter what.
RAID in Semi-dedicated Hosting
The RAID type which we use for the cloud hosting platform where your semi-dedicated hosting
account shall be created is known as RAID-Z. What is different about it is that at least 1 of the disks is employed as a parity drive. Put simply, whenever any data is duplicated on this special disk drive, one more bit is included to it and in case a faulty disk is replaced, the information which will be duplicated on it is a combination of the data on the remaining hard disks in the RAID and that on the parity one. It's done this way to ensure that the information is intact. Throughout this process, your sites will be working normally because RAID-Z makes it possible for an entire drive to fail without causing any service disruptions and it simply uses one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to warrant that no data will get silently corrupted on our servers, you won't have to worry about the integrity of your files.
RAID in VPS Hosting
All virtual private server
accounts that we provide are created on physical servers that employ SSD drives working in RAID. At least one drive is employed for parity - one extra bit is included in the info copied on it and if a main disk breaks down, this bit makes it easier to recalculate the bits of the files on the failed disk drive so that the right data is restored on the new drive included in the RAID. In the mean time, your sites will stay online because all the data will still load from at least one other drive. In case you add routine backups to your VPS package, a copy of your information will be saved on standard hard disks which also function in RAID because we would like to make certain that any sort of website content you upload will be safe and sound all of the time. Using multiple hard drives in RAID for all main and backup servers enables us to offer fast and reliable Internet hosting service.