Disk Performance Comparison of Hard Disk, SCSI Ramdisk and Direct IO Ramdisk (2)

2. Atto Disk Benchmark v2.43

ATTO Disk Benchmark is one of the hard drive benchmarks that is easy to use. It can measure raw transfer rate for both reads and writes (full sequential, not random). Here the test was run of 0.5KB through 128 KB transfer size with the total length being 128MB.

Physical Hard Disk

SCSI Ramdisk

Direct IO Ramdisk

We can find the similar results as that from Iometer. One thing should be noticed is test result will overflow when transfer rate is over 1000MB/Sec (or 1024MB/Sec? Not very clear about the exact threshold). For example, read transfer rate of 128KB transfer size is 198554 KB/Sec in the graph of SCSI Ramdisk Test Result, the correct data is possibley over 1198554 KB/Sec.

3. FDBENCH v1.02

Physical Hard Disk

SCSI Ramdisk

Direct IO Ramdisk

FDBENCH also have problem in displaying the result which is over 1000000 KByte/Sec. The correct data can be got by clicking "Copy" button in the menu and then pasting to a text file.