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

Solid State Drive (0)

SSD, Solid State Drive, HDD, Hard Disk Drive, Compare

Hard Disk Drive
People still use traditional hard disk drives as storage units. A hard disk drive is a mechanical device which writes data to a spinning disk with magnetic field. Raising of the need of more speed, more performance and more storage capacity brought problems together. HDDs don't support the needs of today's people.

Solid State Drive
A solid state drive is not a mechanical device as hard disks. There is no spinning piece. They resist high vibrations and impacts. You can move a SSD in runtime.

Solid state disks write the data to cells electrically. The SSDs run with about 1ms random access time and this gives more speed to the user.

• 1

• 2