On Sat, Jun 26, 2010 at 04:21:52PM +0200, Christoph Anton Mitterer wrote:
> On Sat, 2010-06-26 at 14:52 +0200, Arno Wagner wrote:
> > As far as I know, the "remount,ro" does a complete flush, just
> > as an umount does.
> But that doesn't answer, whether the flush propagates through all
> layers... it could be that one layer has to wait (e.g. lvm, when using
> clustering)...
Umount does propagate. If it ever does not, the disk layer will
be basically unusable. Until then, don't worry about it.
> And I'm not even sure if flushing alone is enough,... or where one needs
> something like barriers...
Barriesrs are a filesystem concept and play no role here.
Flushing ("fdatasync" or "fsunc") is not enough in some cases,
hence the ro-remount, which is.
Arno
--
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx
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