Dell
RAID 0
RAID 1
RAID 1
Data 1 |
| Data 1 | Data 2 |
| Data 2 | |
Data 3 | = | Data 3 | Data 4 | = | Data 4 | |
Data 5 | Data 5 | Data 6 | Data 6 | |||
|
| |||||
Data 7 |
| Data 7 | Data 8 |
| Data 8 | |
Drive 0 |
| Drive 1 | Drive 2 |
| Drive 3 |
Figure 8. Example of RAID 10 (1 + 0)
Advantages of RAID 10
∙RAID 10 has the same redundancy as RAID level 1
∙High I/O rates are achieved by striping RAID 1 segments
∙Allows creation of largest RAID group with up to 192 drives connected to PERC H800
Disadvantages of RAID 10
∙Most expensive RAID solution
∙Requires 2n where n > 1 disks
5.3.6RAID 50 (Striping Across RAID 5)
RAID 50 is a variation of RAID 5 that maps data across two or more RAID 5 virtual disks. The RAID 5 subset must have at least three disks. Figure 9 illustrates how the parity data is stored. RAID 50 stripes data across each RAID 5 subset. RAID 50 provides a higher degree of fault tolerance since 1 drive per RAID 5 set may fail without data being lost.
A performance increase over RAID 5 may be realized depending on the configuration due to fewer disks reads per parity calculation.
For example, if a comparison of a RAID 5 virtual disk with 6 disks were made to a RAID 50 virtual disk with two 3 disk RAID 5 virtual disks, the parity calculation on the RAID 10 virtual disk would require reading all 6 disks each time, where the parity calculation on the RAID 50 may require only reading 3. This may vary depending on several factors such as cache and data block sizes.
DELL PERC H700 and H800 Technical Guide | 26 |