Try :
USB -> HDD.
Please dont use an SSD.
You are not testing correctly.
On Wed, Apr 1, 2020 at 8:56 AM Ed Greshko <ed.greshko@xxxxxxxxxxx> wrote:
On 2020-04-01 09:14, Roger Heflin wrote:
> To have the issue it helps to have the reading disk be a quite a bit
> faster than the receiving disk that way the reading disk can easily
> get ahead and fill up the write cache faster than the reading disk can
> process it (it backs up into the writecache).
>
> So USB3.0 3.5-7200rpm or an SSD will easily overrun a standard laptop
> 5900 rpm 2.5" hard disk.
This was not done on a quiet system CPU wise, boinc jobs running. But not much other I/O going on.
SDD--->USB-Flash
real 16m38.608s
user 0m1.416s
sys 3m37.379s
USB-Flash--->SDD
real 6m37.671s
user 0m0.662s
sys 1m4.984s
I then found an old laptop HDD in a USB 2.0 enclosure. Reading from the SDD should be much faster
than writing to the HDD.
SDD--->HDD
real 30m53.407s
user 0m0.942s
sys 2m46.756s
HDD--->SDD
real 32m48.615s
user 0m0.896s
sys 1m9.483s
And, for completeness
SDD--->SDD
real 4m58.406s
user 0m0.517s
sys 1m8.402s
No issues at anytime with stability or slowdown in all cases.
--
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Regards,
Sreyan Chakravarty
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