[Elphel-support] Testing HDD Writespeed

[Andrey Filippov]

Sebastian,

Are you getting problems in the middle of the file or when the camera starts
a new one? Our experience (but we used it with huge "triplets" for Eyesis
show that most problems are when camera operating system creates a new file.
Oleg wrote some profiling tools that watches the buffer, there is also an
application that dynamically adjusts the compression quality to keep buffer
from being overrun.

If you have similar problems you may want to decrease the partition sizes
and/or files per directory - see if that helps.

Andrey

On Sun, Sep 26, 2010 at 10:14 AM, Sebastian Pichelhofer <
sebastian.pichelhofer at gmail.com> wrote:

> Does anyone know a reliable way of testing a HDDs write speed over the
> entire free space area (faster outer regions to slower inner regions)
> without having to fill up the entire disk which could take quite a
> while for big disks?
> Maybe write 3x1GB blocks (outer area, center area, inner area)?
>
> Most likely this will only work with a completely empty disk
> (formating before testing), right?
>
> Optimally this would be doable with dd or other tools that are
> available in the cameras...
>
> Regards Sebastian
>
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