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