Redundant Array of Independent Disks, or RAID, is a method of saving content on a number of hard drives concurrently. A RAID might be software or hardware depending on the hard drives which are used - physical or logical ones, however what is common between them is the fact that they all operate as just a single unit where data is saved. The key advantage of using a RAID is redundancy because the info on all of the drives is exactly the same all of the time, so even in case a drive fails for whatever reason, the information will still be present on the rest of the drives. The overall performance will also improve because the reading and writing processes will be split between multiple drives, so a single one will never be overloaded. There are different types of RAIDs where the effectiveness and fault tolerance can vary according to the exact setup - whether data is written on all of the drives real-time or it's written on a single drive and afterwards mirrored on another, what number of drives are used for the RAID, and so on.

RAID in Shared Hosting

The hard drives that we employ for storage with our top-notch cloud web hosting platform are not the standard HDDs, but super fast solid-state drives (SSD). They function in RAID-Z - a special setup designed for the ZFS file system which we use. All the content that you upload to the shared hosting account will be saved on multiple hard disks and at least one shall be employed as a parity disk. This is a special drive where a further bit is added to any content copied on it. In the event that a disk in the RAID stops functioning, it will be changed without any service disturbances and the information will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the other disks. This is done in order to guarantee the integrity of the info and along with the real-time checksum authentication which the ZFS file system performs on all drives, you won't ever need to worry about losing any data no matter what.

RAID in Semi-dedicated Servers

In case you host your sites inside a semi-dedicated server account from our company, all the content you upload will be held on SSD drives which work in RAID-Z. With this kind of RAID, at least one of the disks is used for parity - when data is synchronized between the disks, an additional bit is included in it on the parity one. The idea behind this is to guarantee the integrity of the info which is copied to a brand new drive if one of the drives in the RAID stops functioning because the website content being copied on the brand new disk is recalculated from the data on the standard hard drives and on the parity one. An additional advantage of RAID-Z is the fact that even if a disk drive stops functioning, the system can switch to another one instantly without service interruptions of any sort. RAID-Z adds one more level of security for the content you upload on our cloud web hosting platform in addition to the ZFS file system which uses unique checksums so as to verify the integrity of every single file.

RAID in VPS Servers

The SSD drives which we use on the physical machines where we create VPS servers function in RAID to make sure that any content which you upload will be available and intact at all times. At least 1 drive is used for parity - one bit of data is added to any data copied on it. If a main drive fails, it is replaced and the info that will be cloned on it is calculated between the remaining drives and the parity one. This is done to make sure that the right data is copied and that not a single file is corrupted as the new drive will be included in the RAID afterwards. Also, we use hard disks functioning in RAID on the backup servers, so if you add this upgrade to your VPS package, you shall use an even more reliable hosting service since your content will be available on multiple drives irrespective of any sort of sudden hardware failure.