I need some help in interpretting the following speed tests on two Volumes on my home PC.
The test:
- CrystalDiskMark 2.2
- Windows 7 Disk Cache was disabled
- Both volumes were 0% fragmented before the test
Drive C:
- A Windows 7 Software RAID1
Dual Samsung HD501LJ drives (500GB, 16MB Cache, 7200RPM)
Sequential Read: 69.580 MB/s Sequential Write: 10.434 MB/s Random Read 512KB: 36.241 MB/s Random Write 512KB: 11.191 MB/s Random Read 4KB: 0.499 MB/s Random Write 4KB: 0.283 MB/s Test Size: 100 MB
Drive D:
- An integrated Intel Matrix RAID 10
Four Seagate ST3500320AS drives (500GB, 32MB Cache, 7200RPM)
Sequential Read: 120.388 MB/s Sequential Write: 59.587 MB/s Random Read 512KB: 35.677 MB/s Random Write 512KB: 27.713 MB/s Random Read 4KB: 0.634 MB/s Random Write 4KB: 0.299 MB/s Test Size: 100 MB
Differences
Sequential Read: + 73%
Sequential Write: + 471%
Random Read 512KB: - 2%
Random Write 512KB: + 148%
Random Read 4KB: + 27%
Random Write 4KB: + 6%
Would you agree with these statements?
- "Sequential Read" improved probably because of: 4 disks to read from, not 2 AND better cache AND integrated RAID
- "Sequential Write" improved probably because of integrated RAID
- "Random Read 512KB" loss is nominal... and probably can't be easily explained in this scenario.
- "Random Write 512KB" improved probably because of integrated RAID
- "Random Read 4KB" improvement is a cross between Sequential Read (ideal) and Random Read 512KB (not ideal)
- "Random Write 4KB" improvement is a cross between Sequential Write (ideal) and Random Write 512KB (not ideal)