Samsung MLC SSD vs. Seagate HDD on FreeBSD (0)

Samsung, Seagate, SSD, HDD, MLC, 7200 RPM

We will share some new test results and repeat our old test again with a different method. Here's the results:

Samsung MLC SSD (16 GB)

ad6: 15272MB <SAMSUNG MMBRE16GSMPP-MVA VAM1101Q> at ata3-master SATA150
# diskinfo -c -t /dev/ad6s1d
/dev/ad6s1d
        512             # sectorsize
        16013910528     # mediasize in bytes (15G)
        31277169        # mediasize in sectors
        31028           # Cylinders according to firmware.
        16              # Heads according to firmware.
        63              # Sectors according to firmware.
        ad:SE932A6474s0s3       # Disk ident.

I/O command overhead:
        time to read 10MB block      0.126062 sec       =    0.006 msec/sector
        time to read 20480 sectors   2.174676 sec       =    0.106 msec/sector
        calculated command overhead                     =    0.100 msec/sector

Seek times:
        Full stroke:      250 iter in   0.044461 sec =    0.178 msec
        Half stroke:      250 iter in   0.037622 sec =    0.150 msec
        Quarter stroke:   500 iter in   0.081761 sec =    0.164 msec
        Short forward:    400 iter in   0.059677 sec =    0.149 msec
        Short backward:   400 iter in   0.065554 sec =    0.164 msec
        Seq outer:       2048 iter in   0.256953 sec =    0.125 msec
        Seq inner:       2048 iter in   0.251158 sec =    0.123 msec
Transfer rates:
        outside:       102400 kbytes in   1.389104 sec =    73717 kbytes/sec
        middle:        102400 kbytes in   1.038866 sec =    98569 kbytes/sec
        inside:        102400 kbytes in   1.582221 sec =    64719 kbytes/sec

ad4: 305245MB <Seagate ST3320613AS SD22> at ata2-master SATA150
# diskinfo -c -t /dev/ad4s1h
/dev/ad4s1h
        512             # sectorsize
        83310216192     # mediasize in bytes (78G)
        162715266       # mediasize in sectors
        161423          # Cylinders according to firmware.
        16              # Heads according to firmware.
        63              # Sectors according to firmware.
        ad:6SZ08FFZs0s7 # Disk ident.

I/O command overhead:
        time to read 10MB block      0.182695 sec       =    0.009 msec/sector
        time to read 20480 sectors   2.006781 sec       =    0.098 msec/sector
        calculated command overhead                     =    0.089 msec/sector

Seek times:
        Full stroke:      250 iter in   5.686091 sec =   22.744 msec
        Half stroke:      250 iter in   4.090876 sec =   16.364 msec
        Quarter stroke:   500 iter in   7.218680 sec =   14.437 msec
        Short forward:    400 iter in   3.434101 sec =    8.585 msec
        Short backward:   400 iter in   3.063467 sec =    7.659 msec
        Seq outer:       2048 iter in   0.207484 sec =    0.101 msec
        Seq inner:       2048 iter in   0.898884 sec =    0.439 msec
Transfer rates:
        outside:       102400 kbytes in   1.349878 sec =    75859 kbytes/sec
        middle:        102400 kbytes in   1.347827 sec =    75974 kbytes/sec
        inside:        102400 kbytes in   1.919180 sec =    53356 kbytes/sec