Redundant Array of Independent Disks, or RAID, is a method of keeping content on several hard drives simultaneously. A RAID can be software or hardware based on the hard drives which are used - physical or logical ones, still what’s common between them is the fact that they all work as just one single unit where your information is saved. The key advantage of employing a RAID is redundancy because the info on all the drives is identical at all times, so even in case one of the drives fails for some reason, the data will still be present on the remaining drives. The general performance is also better since the reading and writing processes could be split between multiple drives, so a single one will never be overloaded. There're different types of RAIDs where the functionality and fault tolerance may differ based on the exact setup - whether information is written on all drives real-time or it is written on one drive and then mirrored on another, what number of drives are used for the RAID, and so on.
RAID in Cloud Hosting
All content that you upload to your new cloud hosting account will be held on quick SSD drives which operate in RAID-Z. This setup is built to work with the ZFS file system that runs on our cloud Internet hosting platform and it adds one more level of security for your website content on top of the real-time checksum authentication which ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is saved on a couple of disks and at least 1 is a parity disk - whenever data 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 will not be interrupted and it will continue functioning smoothly until the problematic drive is replaced and the information is synchronized on it.
RAID in Semi-dedicated Servers
The data uploaded to any semi-dedicated server account is kept on SSD drives which operate in RAID-Z. One of the drives in type of a setup is used for parity - every time data is copied on it, an additional bit is added. If a disk turns out to be problematic, it will be taken out of the RAID without interrupting the functioning of the websites since the data will load from the other drives, and when a brand new drive is added, the data which will be duplicated on it will be a combination between the data on the parity disk and data stored on the other hard disks in the RAID. This is done so as to ensure that the data that is being cloned is accurate, so the moment the new drive is rebuilt, it can be included in the RAID as a production one. This is an additional guarantee for the integrity of your data as the ZFS file system that runs on our cloud web hosting platform analyzes a special checksum of all the copies of the files on the different drives to be able to avoid any probability of silent data corruption.
RAID in VPS Servers
All VPS server accounts that our company offers are created on physical servers which use SSD drives operating in RAID. At least one drive is intended for parity - one additional bit is added to the info cloned on it and in case a main disk breaks down, this bit makes it simpler to recalculate the bits of the files on the failed hard disk so that the accurate information is restored on the new drive included in the RAID. In the mean time, your Internet sites will remain online because all the data will still load from at least one more drive. In case you add regular backups to your VPS plan, a copy of the information will be kept on standard hard disks which also operate in RAID because we want to make certain that any kind of website content you add will be protected all of the time. Using multiple hard disks in RAID for all of the main and backup servers allows us to offer fast and reliable hosting service.