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Old 13th November 2008
DrJ DrJ is offline
ISO Quartermaster
 
Join Date: Apr 2008
Location: Gold Country, CA
Posts: 507
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Seagate 15K.3 (SCSI) drive, about five years old:

Code:
pinot# diskinfo -c -t /dev/da0
/dev/da0
	512         	# sectorsize
	36703934464 	# mediasize in bytes (34G)
	71687372    	# mediasize in sectors
	4462        	# Cylinders according to firmware.
	255         	# Heads according to firmware.
	63          	# Sectors according to firmware.

I/O command overhead:
	time to read 10MB block      0.143325 sec	=    0.007 msec/sector
	time to read 20480 sectors   4.014771 sec	=    0.196 msec/sector
	calculated command overhead			=    0.189 msec/sector

Seek times:
	Full stroke:	  250 iter in   2.194760 sec =    8.779 msec
	Half stroke:	  250 iter in   1.737971 sec =    6.952 msec
	Quarter stroke:	  500 iter in   2.936857 sec =    5.874 msec
	Short forward:	  400 iter in   1.671453 sec =    4.179 msec
	Short backward:	  400 iter in   0.840368 sec =    2.101 msec
	Seq outer:	 2048 iter in   0.243329 sec =    0.119 msec
	Seq inner:	 2048 iter in   0.247530 sec =    0.121 msec
Transfer rates:
	outside:       102400 kbytes in   1.402288 sec =    73024 kbytes/sec
	middle:        102400 kbytes in   1.568473 sec =    65286 kbytes/sec
	inside:        102400 kbytes in   2.133166 sec =    48004 kbytes/sec
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