Redundant Array of Independent Disks, or RAID, is a method of keeping content on multiple hard disk drives simultaneously. A RAID could be software or hardware depending on the hard drives which are used - physical or logical ones, still what is common between them is that they all perform as just one single unit where info is kept. The main advantage of employing a RAID is redundancy since the data on all of the drives shall be the same all of the time, so even in case some drive fails for whatever reason, the info will still be present on the other drives. The overall performance will also improve because the reading and writing processes could be split between multiple drives, so a single one won't be overloaded. There are different kinds of RAIDs where the capabilities and fault tolerance may vary based on the exact setup - whether information is written on all drives in real time or it's written on one drive and afterwards mirrored on another, what amount of drives are used for the RAID, etc.

RAID in Cloud Hosting

Any content which you upload to your new cloud hosting account will be held on quick SSD drives that work in RAID-Z. This setup is built to work with the ZFS file system which runs on our cloud web hosting platform and it adds an additional level of security for your content in addition to the real-time checksum verification which ZFS uses to ensure the integrity of the data. With RAID-Z, the information is stored on a number of 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 fails for some reason, the integrity of the data can be verified by recalculating its bits based on what is stored on the production hard drives and on the parity one. With RAID-Z, the operation of our system won't be interrupted and it'll continue operating efficiently until the faulty drive is changed and the information is synchronized on it.

RAID in Semi-dedicated Servers

The data uploaded to any semi-dedicated server account is saved on SSD drives which work in RAID-Z. One of the drives in type of a setup is used for parity - every time data is copied on it, an extra bit is added. In case a disk turns out to be problematic, it will be taken out of the RAID without interrupting the functioning of the Internet sites since the data will load from the remaining drives, and when a new drive is added, the info that will be duplicated on it will be a blend 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 copied is correct, so once the new drive is rebuilt, it could be included in the RAID as a production one. This is one more warranty for the integrity of your info as the ZFS file system which runs on our cloud hosting platform compares a unique checksum of all of the copies of the files on the various drives in order to avoid any chance of silent data corruption.