Hello David, 

what happens, if power goes away?
Is the QNX6 filesystem (stored in the container file on ETFS) consistent after  power loss?

Michael

> Michael,
> 
> Devb-loopback uses a standard file descriptor to access the underlying
> image. Because of this, nothing is different from ETFS, so the normal
> ETFS power reliability rules apply.  You might want to allow a bit more
> time when flushing writes, since you first have to sync the qnx6
> filesystem, and THEN sync the ETFS filesystem, so any safe shutdown
> should be sync'd twice.  Otherwise, you'll be safe.
> 
> David
> 
> > -----Original Message-----
> > From: Michael Tasche [mailto:community-noreply@qnx.com]
> > Sent: April-12-11 5:50 AM
> > To: general-filesystems
> > Subject: QNX6 over ETFS powersafe ?
> > 
> > Hi all,
> > 
> > we have still problems with the etfs filesystem on big  NAND-flashes
> in
> > projects with heavy filesystem use.
> > e.g. : Crashing of resource manager, randomly poor performance, long
> > mount times.
> > 
> > We have got an experimental version of libetfs.a from the support
> team,
> > which solved some of the hardest problems, like total data-loss.
> > We still have an active ticket, waiting for the next fixes.
> > 
> > At the Moment I test a configuration with only one file in the etfs
> > Filesystem
> > This file contains a qnx6 filesystem,  mounted over devb-loopback.
> This
> > configuration seems to work well without any etfs problems or limits.
> > 
> > But is this configuration still powersafe?
> > 
> > Regards
> > Michael
> > 
> > 
> > 
> > 
> > _______________________________________________
> > 
> > General
> > http://community.qnx.com/sf/go/post84889