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Old 9th July 2008
m4rc m4rc is offline
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Default Disk I/O Throughput

I've an question regarding disk I/O throughput.

The observation:
When I cp a 1 GB file within sd0 it takes about 100 sec.
When I attach sd1 via USB2 and cp the file from sd0 it takes about 80 sec.
When I cp this file back from sd1 to sd0 it takes about 40 sec.

The disk specs:
sd0 at scsibus0 targ 0 lun 0: <ATA, Hitachi HTS54161, SB4O> SCSI3 0/direct fixed
sd0: 152627MB, 19457 cyl, 255 head, 63 sec, 512 bytes/sec, 312581808 sec total
sd1 at scsibus1 targ 1 lun 0: <SAMSUNG, HD401LJ, 0-15> SCSI2 0/direct fixed
sd1: 381554MB, 48641 cyl, 255 head, 63 sec, 512 bytes/sec, 781422768 sec total


Now I wonder why it takes longer to cp a file within sd0 than from/to sd1.
I also would like to know if my disk throughput performs averagely. tak sa mycket!

Edit:
P.S. And when I cp the file within sd1 it takes about 120 sec.

Last edited by m4rc; 9th July 2008 at 04:33 PM.
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