[arm-allstar] RPi2 image file shasums-- Was: Arch vulnerabilities

[Fred Moore]

Doug, (and list)  I really am not trying to be controversial, nor am I
complaining, I actually very much appreciate the work you guys are
doing.. However as you most likely know the card class has nothing to do
with reading speed, it is 100%  only about the write speed.. I actually
when running don't plan on writing a lot of files..

The problem I was having was simple, The first time I attempted to dd
your image it was taking a huge amount of time after more than 1.5 hours
I aborted the dd, and fired up the tools to investigate what was going
on.  My investigation showed I could write the rasberrian iso at around
3.1 m/s to a  4 m/s device with no problems at all (just as I would
expect),    When I was writing to the same card with your image I was
only getting .9 m/s average and what looked like a huge number of
re-read's from the input file.. ,  I will track down why this is only
occurring on your image, and not others.. I have used 3 different
copies, of your image, they all show the same problem. Before anyone
asks they were not file links.. they were different files with different
inode numbers. 

I have dd 2 other distributions today and they don't show any problem..
all write to this card at around 3-3.3 m/s, exactly what I would expect.
  I will investigate it further as soon as I have some time..   I won't
bother the list further on this subject..

I only asked if anyone else was having any issues they were seeing as I
didn't want to reinvent the wheel..

I do wonder why you recommend a class 10 card when the PI2 sd card you
can order directly from them is a class 6 ?   Anyway back to other
stuff.. I need to hook up a radio,  and get it working between stuff
that I have to do to keep my family eating..    BTW the card I am using
is branded Sandisk..  Fred


On 5/1/15 9:20 AM, Doug Crompton wrote:
> You mentioned a 16G class 4 card. We recommend nothing less than a
> class 10 and in most cases we are using class 10 plus cards at this
> time. Also Sandisk brand is recommended.  Using cheap unbranded cards
> and cards of less than class 10  can lead to the problems that people
> often complain about in other distributions.
>
> So far we have had very little SD card problems. I have programmed and
> run dozens of systems and never had a problem with Sandisk class 10 8G
> or 16G cards. I never expand the file system nor do I recommend doing
> it unless you have a specific application.
>
> Write times vary mostly depending on the writer and USB speeds when
> you are using a class 10 but are usually in the 10 minute range.
>
> It is always a good idea to have a backup card but as long as you
> don't change anything much from the setup in many cases it would be
> just as easy to setup a new card if you lost the old one for some reason.
>
> *73 Doug
> WA3DSP
> http://www.crompton.com/hamradio*
>
>
>
>
> -- 
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-- 
Fred Moore
email: fred at fmeco.com
       fred at safes.com
phone:  321-217-8699

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