On 01/03/17 12:30, Andreas Berger wrote:
In our previous episode, Mark Morgan Lloyd said:
I agree. Most of our RPis are actually running Debian, but in extremis
it's always possible to roll back to Raspbian as a baseline
configuration.
There are of course other small boards: Olimex, Odroid and now Asus.
However RPi does offer a fairly flexible and cost-effective range, and
unless the OP is considering shipping hundreds rather than 10s of boards
I suggest that getting onto both the Linux learning curve and one for
minority hardware is quite simply not cost-effective.
The problem is that rpi has no fast storage interface (like SATA),
some of
the more expensive orangepis have sata. (though I'm not entirely sure
if it
is not bridged via usb)
Storage is one of the factors the HW developers mentioned. The system
using the Pi will be doing a LOT of information logging. I personally
don't know if it is a factor since all log info in coming in on a 10MBit
ethernet so it shouldn't overload the file system. We have a project
using a Blackfin that save data (in similar proportions) on a SDCard.
I've got a normally very cautious engineer colleague who for the last
two or three years has been saving CCTV frames onto an SD-Card without
problem. I think he's still some way from filling it.
My understanding is that there are two issues that need to be considered:
i) Each cell on that sort of device can only be written a certain
number of times before its performance degrades. For FAT etc. that
includes the directory area, which will be getting updated in situ even
if the remainder of the filesystem is only being written (i.e. to virgin
blocks).
ii) A power failure during a write or update is particularly risky.
So far I've had an eMMC module and a couple of (identical) thumb drives
fail during normal operation, i.e. not through power removal.
The article below, from the well-respected Bunnie Huang, illustrates
some interesting problems affecting what would be expected to be quality
devices. https://www.bunniestudios.com/blog/?page_id=1022
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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