
40 DS8800 Performance Monitoring and Tuning
For random reads, which are the most prevalent type of reads in a workload profile, consider
these comparisons:
When comparing 4K random reads, the 2.5 inch 10K SAS drives deliver only 10% fewer
IOPS than the 3.5 inch 15K FC drives.
The 2.5 inch 15K SAS drives deliver around 10% more IOPS than the 3.5 inch 15K FC
drives.
For sequential loads, the DS8800 2.5 inch 10K SAS drives perform equivalently or better than
the DS8700 3.5 inch 15K FC drives. The 2.5 inch SFF drives consume half as much power as
the 3.5 inch HDDs and save on floor space.
The 10K rpm Enterprise-SAS HDDs with larger capacities are ...