Roberto,
The problem comes from wanting to use a classic MVC web system. In these
systems, the assumption is that the database is the true state and that
the web draws whatever is in the database. Since I am scanning each of
the power supplies several times a second, this means that the database
journal(log) file is constantly getting update transactions (different
than the filesystem journal file.)
After a night of thinking about it, I think I can cut the writes down by
a couple orders of magnitude. With that I think I can make it by.
jerry
On 11/23/2014 03:53 AM, Roberto Spadim wrote:
I dom't undestood the problem
You will write how many times per second? What's the minimal period
that you need? Maybe a compact file should solve this problem
Em domingo, 23 de novembro de 2014, Jerry Scharf
<[email protected]
<mailto:[email protected]>> escreveu:
Hi,
I am using a flash only system to be the master of my system for
testing
300 power supplies. I want to use a MVC database/web design. In a
normal
disk based system, I wouldn't give the fact that the state of the each
power supplies and microcontroller card is being updated several
times a
second, a disk would easily keep up and the wear problem is
measured in
years of continuous read/write.
I am worried about wearing out the flash with writing entire
blocks when
the transaction log files are only incrementing by hundreds of bytes.
100TB of writes sounds like a lot, but doing a 128kB write hundreds of
times a second could wipe that out in less than a month by my
calculations.
Is this something to worry about? I have a work around, but it's a bit
tricky and less than perfect.
thanks,
jerry
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Roberto Spadim
SPAEmpresarial
Eng. Automação e Controle
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