Re: [gentoo-user] [OT] Curious hdparm results

[Volker Armin Hemmann]

Am Sonntag, 13. Mai 2012, 13:28:45 schrieb walt:
> I have a usb3 docking station which is showing some behavior I don't
> understand:
>
>  #hdparm -t /dev/sdc
>
> /dev/sdc:
>  Timing buffered disk reads: 266 MB in  3.00 seconds =  88.59 MB/sec
>  Timing buffered disk reads: 268 MB in  3.01 seconds =  89.05 MB/sec
>  Timing buffered disk reads: 266 MB in  3.01 seconds =  88.43 MB/sec
>  Timing buffered disk reads: 266 MB in  3.02 seconds =  88.10 MB/sec
>  Timing buffered disk reads: 306 MB in  3.01 seconds = 101.72 MB/sec
>  Timing buffered disk reads: 266 MB in  3.00 seconds =  88.59 MB/sec
>  Timing buffered disk reads: 306 MB in  3.00 seconds = 101.84 MB/sec
>  Timing buffered disk reads: 306 MB in  3.00 seconds = 101.86 MB/sec
>
> That's all the same disk, repeating hdparm as fast as I could.  The
> disk was not even mounted at the time, and no other disks were active.
>
> Two very different but reproducible numbers, changing values at random
> times.  The only thing I can think of is that the disk may be doing
> a SMART self-test, but for some reason the USB connection prevents
> me from accessing the data so I can't test my theory.
>
> Any other ideas?

it is usb... don't loose any sweat about it. The numbers are fine and variation 
is to be expected.

-- 
#163933