RAID, or Redundant Array of Independent Disks, is a technology of saving data on multiple hard disks that operate together as one single logical unit. The drives can be physical or logical i.e. in the aforementioned case one drive is divided into individual ones via virtualization software. In either case, the very same data is kept on all of the drives and the key benefit of using this type of a setup is that in the event that a drive stops working, the data will remain available on the other ones. Having a RAID also enhances the overall performance since the input and output operations will be spread among a number of drives. There are several types of RAID based on how many hard disks are used, whether writing is carried out on all the drives in real time or just on one, and how the information is synced between the hard drives - whether it is recorded in blocks on one drive after another or all of it is mirrored from one on the others. All these factors show that the error tolerance and the performance between the various RAID types may differ.
RAID in Website Hosting
The SSD drives that our cutting-edge cloud web hosting platform uses for storage work in RAID-Z. This kind of RAID is designed to work with the ZFS file system that runs on the platform and it uses the so-called parity disk - a special drive where data kept on the other drives is duplicated with an additional bit added to it. In the event that one of the disks stops functioning, your websites will continue working from the other ones and as soon as we replace the malfunctioning one, the information that will be duplicated on it will be recovered from what is stored on the remaining drives along with the info from the parity disk. This is done so as to be able to recalculate the elements of every single file adequately and to validate the integrity of the info copied on the new drive. This is an additional level of security for the information that you upload to your website hosting
account in addition to the ZFS file system which compares a unique digital fingerprint for every single file on all of the hard drives in real time.
RAID in Semi-dedicated Servers
The information uploaded to any semi-dedicated server
account is stored on SSD drives which work in RAID-Z. One of the drives in such a configuration is used for parity - any time data is cloned on it, an additional bit is added. If a disk turns out to be flawed, it will be taken out of the RAID without disturbing the operation of the Internet sites since the data will load from the remaining drives, and when a brand new drive is included, the information that will be copied on it will be a mix between the information on the parity disk and data kept on the other hard disks in the RAID. This is done in order to guarantee that the info that is being copied is correct, so as soon as the new drive is rebuilt, it can be included in the RAID as a production one. This is an additional warranty for the integrity of your information because the ZFS file system which runs on our cloud hosting platform compares a special checksum of all the copies of your files on the various drives so as to avoid any chance of silent data corruption.
RAID in VPS Servers
All VPS server
accounts which our company provides are made on physical servers which employ SSD drives working in RAID. At least 1 drive is intended for parity - one additional bit is included in the information cloned on it and in case a main disk fails, this bit makes it easier to recalculate the bits of the files on the damaged drive so that the accurate information is restored on the new drive included in the RAID. Meanwhile, your websites will still be online because all the data will still load from at least 1 more drive. In case you add routine backups to your VPS plan, a copy of your data will be stored on standard hard drives which also function in RAID because we would like to make sure that any sort of content you upload will be safe and sound all of the time. Using multiple hard drives in RAID for all the main and backup servers permits us to offer fast and reliable hosting service.