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Thread: Re: data logging without flash fatigue




Re: data logging without flash fatigue
country flaguser name
United States
2008-03-29 07:24:22

--- In ts-7000%40yahoogroups.com">ts-7000yahoogroups.com, Triffid Hunter <triffid_hunter...>
wrote:
>
&gt; On Sat, 29 Mar 2008, j.chitte wrote:
&gt;
> > Hi,
> >
>; > I am needing to log data once a second, although this is not
enormous
> > it seems sufficiently frequent to reduce long term life of the
root
> > fs on the onboard flash device (and hence effective board death).
> >
>; > I'd thought of creating a small ramdisk and setting up a cron to
save
> > it every hour.
&gt; >
>; > Is there a better/alternative technique?
> >
>; > Thanks for any suggestions from those who have found solution to
this
> > issue. Also any caveats to be aware of (apart from the obvious
> > turning off apache logs).
&gt; >
>; > TIA, jacques.
>
> 1gb usb stick is your friend. so cheap you can just replace when
it wears
> out.
>;
> Setting disk commit inverval to 1-10 minutes will help too.
>;

Yes, a usb stick is one solution but a usb connection it is about the
most mechanically non rubust thing I can think of , unlike the board
itself to this seems to rather knock the robustness of the TS boards
for 6. I'd like to remain onboard is poss.

I believe the commit interval is a ext3 function isn't it, the on
board fs is yaffs2. Please correct me if I'm wrong.

thanks for your suggestions. I will try to find some equiv of commit
interval if that exists on yaffs.

/js

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Re: data logging without flash fatigue
user name
2008-03-29 07:33:45

Hi,

j.chitte < j.chitte%40yahoo.com">j.chitteyahoo.com> [20080329 12:24:22 -0000]:
>
> [snipped suggestion of a USB stick]
&gt;
> Yes, a usb stick is one solution but a usb connection it is about the
> most mechanically non rubust thing I can think of , unlike the board
> itself to this seems to rather knock the robustness of the TS boards
> for 6. I'd like to remain onboard is poss.
&gt;
Any reason you could not use the PC/104 bus?

http://www.embeddedarm.com/products/board-detail.php?product=TS-NVRAM2
http://www.embeddedarm.com/products/board-detail.php?product=TS-RF2-CF

Depends on how much data you are talking about but you could find a PC/104
PCMCIA card or CompactFLASH system to bolt on.

Of course not just TS do PC/104 bolt-ons...

Cheers

Alex

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