White Papers
Table Of Contents
- 1 Introduction to member RAID policies
- 2 RAID policy availability and performance comparisons
- 3 Setting the member RAID policy
- 4 Displaying the RAID level space distribution
- 5 PS Series array disk layout
- 6 Converting or migrating from a member RAID policy
- 7 Summary
- A 12-Disk PS Series array RAID configurations
- B 14-Disk PS Series array RAID configurations
- C 16-Disk PS Series array RAID configurations
- D 48-Disk PS Series array RAID configurations
- E 42 or 84-disk PS Series RAID configurations
- F Technical support and resources
10 Dell PS Series Storage: Choosing a Member RAID Policy | TR1020 | v 4.7
Corner testing results
Key Observation: As depicted by Figure 3, PS Series had considerable variation in performance amongst
the RAID levels for random write I/O, as compared to the other three corners. Generally speaking, RAID 10 is
very effective with applications that display small, random write intensive I/O, whereas RAID 6 pays a slight
performance penalty for writing out the two parity data to two different disks.
The real world is more complicated, so a variety of workloads are benchmarked that reflect a variety of
conditions. The graphic below depicts results for each RAID policy using a 50/50 mix of reads and writes for
random and sequential I/O.