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Old 13th November 2008
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phoenix phoenix is offline
Risen from the ashes
 
Join Date: May 2008
Posts: 696
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One of the WD 500 GB SATA300 drives in our mega backup server (there are 12 of them):
Code:
da20 at twa1 bus 0 target 8 lun 0
da20: <AMCC 9650SE-12M DISK 3.06> Fixed Direct Access SCSI-5 device
da20: 100.000MB/s transfers
da20: 476827MB (976541696 512 byte sectors: 255H 63S/T 60786C)
Code:
# diskinfo -c -t /dev/da20
/dev/da20                                          
        512             # sectorsize               
        499989348352    # mediasize in bytes (466G)
        976541696       # mediasize in sectors     
        60786           # Cylinders according to firmware.
        255             # Heads according to firmware.    
        63              # Sectors according to firmware.  

I/O command overhead:
        time to read 10MB block      0.153450 sec       =    0.007 msec/sector
        time to read 20480 sectors   3.595345 sec       =    0.176 msec/sector
        calculated command overhead                     =    0.168 msec/sector

Seek times:
        Full stroke:      250 iter in   5.354324 sec =   21.417 msec
        Half stroke:      250 iter in   3.947506 sec =   15.790 msec
        Quarter stroke:   500 iter in   6.297917 sec =   12.596 msec
        Short forward:    400 iter in   2.546029 sec =    6.365 msec
        Short backward:   400 iter in   2.247438 sec =    5.619 msec
        Seq outer:       2048 iter in   0.420714 sec =    0.205 msec
        Seq inner:       2048 iter in   0.380689 sec =    0.186 msec
Transfer rates:
        outside:       102400 kbytes in   1.302843 sec =    78597 kbytes/sec
        middle:        102400 kbytes in   1.497861 sec =    68364 kbytes/sec
        inside:        102400 kbytes in   2.729925 sec =    37510 kbytes/sec
One of the Seagate 400 GB SATA300 drives in same server (there are 12 of them):
Code:
da2 at twa0 bus 0 target 2 lun 0
da2: <AMCC 9550SXU-16 DISK 3.04> Fixed Direct Access SCSI-3 device
da2: 100.000MB/s transfers
da2: 381459MB (781228032 512 byte sectors: 255H 63S/T 48629C)
Code:
# diskinfo -c -t /dev/da2 
/dev/da2                                           
        512             # sectorsize               
        399988752384    # mediasize in bytes (373G)
        781228032       # mediasize in sectors     
        48629           # Cylinders according to firmware.
        255             # Heads according to firmware.
        63              # Sectors according to firmware.

I/O command overhead:
        time to read 10MB block      0.174597 sec       =    0.009 msec/sector
        time to read 20480 sectors   2.579550 sec       =    0.126 msec/sector
        calculated command overhead                     =    0.117 msec/sector

Seek times:
        Full stroke:      250 iter in   5.532021 sec =   22.128 msec
        Half stroke:      250 iter in   3.820743 sec =   15.283 msec
        Quarter stroke:   500 iter in   6.219938 sec =   12.440 msec
        Short forward:    400 iter in   2.524233 sec =    6.311 msec
        Short backward:   400 iter in   1.803372 sec =    4.508 msec
        Seq outer:       2048 iter in   0.288372 sec =    0.141 msec
        Seq inner:       2048 iter in   0.303830 sec =    0.148 msec
Transfer rates:
        outside:       102400 kbytes in   1.704879 sec =    60063 kbytes/sec
        middle:        102400 kbytes in   1.751955 sec =    58449 kbytes/sec
        inside:        102400 kbytes in   2.792769 sec =    36666 kbytes/sec
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