Raid 5 has good failure resistance and better security. The performance is great in Raid 1, but in Raid 5, performance is slow due to disks' redundancy. Data cannot be accessed from a failed drive in Raid 1, whereas data can be accessed from a failed drive in Raid 5.
In RAID 5, data is equally divided in all disks and minimum number of physical disks needed is 3. The main advantages of RAID 5 over RAID 1 are no need of large space, supports data accessing at the time of recovery and high security of data. RAID 5 is generally suited for medium level of applications.
RAID 10 is the safest of all choices, it is fast and safe. The obvious downsides are that RAID 10 has less storage capacity from the same disks and is more costly on the basis of capacity. It must be mentioned that RAID 10 can only utilize an even number of disks as disks are added in pairs.
Unlike RAID 0, RAID 1 provides protection against disk failure. The storage volume will remain accessible even if one of the disks in the mirror set were to fail.
Combining hard disks in a RAID 1 is always worthwhile when one requires high availability of their stored data. Since the storage of these redundant arrays is relatively expensive, they are not suitable for backing up large amounts of data.
RAID 5: This RAID configuration provides the best value for the money. RAID 5 gives you access to more disk space and high read speeds. Write speed suffers a bit in this set up but you can withstand a single drive failure and be ok. RAID 6: Because of parity, RAID 6 can withstand two disk failures at one time.
This parity data is not written to one drive, it is spread across all drives. Using the parity data the system can 'regenerate' the lost data into an information block. Thus, RAID 5 configurations support only the failure of a single storage unit without losing data.
Disadvantages of RAID 1Uses only half of the storage capacity.More expensive (needs twice as many drivers).Requires powering down your computer to replace failed drive.
RAID 5 utilizes parity data on all the storage drives to retrieve lost data. Although writing data onto the drives is much slower, it can be read fast. Most people would say that RAID 5 is the most reliable level because data is retrievable without jeopardizing the performance of the system.
Because RAID 6 uses a double parity scheme, it can protect against the simultaneous failure of two disks. RAID 10 may or may not be able to protect against two disk failures depending on where they occur. If both failed disks are in the same mirror, then the other mirror can take over.
A RAID is still a single device and because of that, also a single point of failure. A BACKUP needs to be a complete and recoverable copy of your data that resides on a separate hard drive possibly even a RAID.
Disadvantages of RAID 1
Uses only half of the storage capacity. More expensive (needs twice as many drivers). Requires powering down your computer to replace failed drive.
RAID 1 is an excellent option when data protection and redundancy is your primary goal. This RAID type stores your data on one disk and then keeps a separate copy of that data on each of the available remaining disks. This means that if one disk goes down, you still have your data ready to go.
Will rebuilding the RAID 1 array erase data There are risks of losing data when you are rebuilding RAID 1. The best way is to back up RAID, and you can use EaseUS Data Recovery Wizard to recover RAID data if you have no backup.
In theory RAID 0 offers faster read and write speeds compared with RAID 1. RAID 1 offers slower write speeds but could offer the same read performance as RAID 0 if the RAID controller uses multiplexing to read data from disks. Where data reliability is less of a concern and speed is important.
RAID 5 arrays have relatively slow write performance because parity information must be written to the disks alongside the actual data. RAID 6 arrays are even slower because they store a greater volume of parity data than RAID 5 arrays do.
Many people mistakenly assume that they are totally protected against data loss with a RAID 1 volume, but nothing could be further from the truth. A RAID 1 volume provides a measure of protection against data loss, but it does not eliminate the need for regular backup of critical data.
RAID 10 stores all data in duplicate. As long as one disk of a mirror pair is still running, the information stored is therefore safe – even if a data carrier fails. Data is only lost if all storage media in a subordinate RAID 1 fail due to a defect or another reason.
RAID-1 and 10 are useful when you need very high performance and reliability, and are commonly seen on OS/boot drives and high-performance application servers. RAID-6 is typically used when a large amount of storage is required and there are a large number of disks in play.
In the event of a RAID 1 failure resulting in data loss, you can try to run some RAID 1 data recovery software. However, even the best RAID 1 recovery programs cannot fix most problems that cause RAID 1 data loss in the first place.
RAID 1 (Mirror) volumes can be deleted without losing data if the RAID 1 volume is: The only volume on the drives.
RAID 1 offers slower write speeds but could offer the same read performance as RAID 0 if the RAID controller uses multiplexing to read data from disks. Where data reliability is less of a concern and speed is important.
So if you want to enjoy better performance and have enough money, RAID 0 SSDs can be a supported option. For hardcore gamers, RAID 0 SSDs can provide faster speeds, reduce load times, and maximize SSD performance.
Storage pools can be changed from one RAID type to another without losing existing data. For example, you can create a RAID 1 storage pool on your Synology NAS and later change it to RAID 5 if you install more drives.
The “safest RAID type” for your data is RAID1 if your storage volume and throughput requirements are low and RAID10 (not RAID01) if you require a larger storage volume and higher performance.