[Voyage-linux] Read/Write on CF Question for Voyage 0.3

[Kim-man "Punky" TSE]

Hi Michael,

May be you can edit /etc/fstab to mount the CF as ro.

- Punky

mgrollman wrote:
>
>
> I have built a number of systems using Voyage 0.2 and now Voyage 0.3.  
> Both are great, but from time to time, with have an issue using 0.3 
> with a hard disk.
>
> Often we add a small hard disk to our systems to record sensor data, 
> still running Voyage itself from the CF.  There is something is the 
> way our 0.2 systems handle the read/write status of the CF card that 
> is different from he way it is handled in 0.3 that relates back to 
> working with the hard disk.  Thus I am curious if there is a way to 
> get the Voyage 0.3 to behave in this manner a bit more like the Voyage 
> 0.2, as in the Voyage 0.3 version, we wind up with some junk data 
> written to the CF card if we are not careful.
>
> Let me explain the failure mode.  For some reason, when a hard disk 
> failures in our 0.2 systems, by the time the application programs that 
> access the drive are loaded, the CF card has been made read-only by 
> the Voyage boot cycle.  However, if the 0.3 version (Etch) in the 
> event of a hard disk failure, application programs will have started 
> already that are accessing the files on the drive mount point, and 
> this makes it impossible to remountro the CF card.  The net result is 
> a bunch of sensor data that should be written to the hard disk gets 
> written to the CF card instead.
>
> I assume the reason the the CF is ever in a read/write state has 
> something to do with preserving the boot log.  But if I am willing to 
> forgo this benefit, what would I need to change in the Voyage startup 
> to ensure that the CF card is read-only as early as possible in the 
> boot cycle?
>
> Any insights are greatly appreciated.
>
> - MichaelG
>
>
>
> _______________________________________________
> Voyage-linux mailing list
> Voyage-linux at list.voyage.hk
> http://list.voyage.hk/mailman/listinfo/voyage-linux


-- 
 

P U N K N ! X  . c o m
Technology + Lifestyle
(http://www.punknix.com)

V O Y A G E . H K - http://www.voyage.hk
Linux - voyage-0.3.1 is released!
Store - New stock for Senao NMP8601 and NMP8602 (100mW)!
      - New low price for Senao NMP-8602 Plus (400mW)!