umount and data is lost?

[Nadav Har'El]

On Sun, Nov 06, 2011, Oleg Goldshmidt wrote about "Re: umount and data is lost?":
> > Does "hdparm -F" perhaps help? (after the umount, before the reboot)
> 
> Eh, "hdparm -f" I guess?

I don't know, I didn't actually test what these do, but according to the
hdparm(8) manual page,

-f     Sync  and  flush  the buffer cache for the device on exit. This
       operation is also performed internally as part of the -t and  -T
       timings and other options.

-F     Flush  the  on-drive  write  cache  buffer (older drives may not
       implement this).

So -f sounds relevant, but I can't really say for sure what they mean
("on exit"? exit from what?). But "-F" sounds exactly what I wanted.

You can try both, and tell us if one of them helped.

-- 
Nadav Har'El                        |                     Sunday, Nov 6 2011, 
nyh at math.technion.ac.il             |-----------------------------------------
Phone +972-523-790466, ICQ 13349191 |"I don't use drugs, my dreams are
http://nadav.harel.org.il           |frightening enough." -- M. C. Escher