Servers - General

RAID Level Migration

 
Shakil-Adil
Occasional Contributor

RAID Level Migration

HI All, I want to convert RAID 60 to RAID 6, is it possible.

 

Regards Shakil Adil

1 REPLY 1
SanjeevGoyal
HPE Pro

Re: RAID Level Migration

Hello,

Good Day !!!!

This is not possible because we can go lower version to higher version but not higher version to lower version. 

RAID 6 (Striping with Dual Parity)

In RAID 6, data is striped across several drives and dual parity is used to store and recover data (Figure 6). It is similar to RAID 5 in performance and capacity capabilities, but the second parity scheme is distributed across different drives and therefore offers extremely high fault tolerance and the ability to withstand the simultaneous failure of two drives in an array.

RAID 6 requires a minimum of 4 drives and a maximum of 32 drives to be implemented. Usable capacity is always two less than the number of available drives in the RAID set.

Usage: Similar to RAID 5, including file servers, general storage servers, backup servers, etc. Poor random write performance makes RAID 6 unsuitable for database applications.

Pros: » Reasonable value for money with a good all-round performance.
» Can survive two drives failing at the same time, or one drive failing and then a second drive failing during the data rebuild. Cons: » More expensive than RAID 5 due to the loss of two drive capacity to parity.
» Slightly slower than RAID 5 in most applications

 

RAID 60 (Striping with Dual Party)

RAID 60 (sometimes referred to as RAID 6+0) combines multiple RAID 6 sets (striping with dual parity) with RAID 0 (striping) (Figures 11 and Figure 12). Dual parity allows the failure of two drives in each RAID 6 array while striping increases capacity and performance without adding drives to each RAID 6 array.

Like RAID 50, a RAID 60 configuration can accommodate 8 or more drives, but should only be used with configurations of more than 16 drives. The usable capacity of RAID 60 is between 50%-88%, depending on the number of data drives in the RAID set.

Note that all of the above multiple-leg configurations that are possible with RAID 10 and RAID 50 are also possible with RAID 60. With 36 drives, for example, you can have a RAID 60 comprising two legs of 18 drives each, or a RAID 60 of three legs with 12 drives in each.

Usage: RAID 60 is similar to RAID 50 but offers more redundancy, making it good for very large capacity servers, especially those that will not be backed up (i.e. video surveillance servers handling large numbers of cameras).

Pros: » Can sustain two drive failures per RAID 6 array within the set, so it is very safe.
» Very large and reasonable value for money, considering this RAID level won’t be used unless there are a large number of drives. Cons:

» Requires a lot of drives.
» Slightly more expensive than RAID 50 due to losing more drives to parity calculations.

 

 

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