> What about ATA disks?
> 
> Currently (at least on x86) the ata driver enables the write cache 
> unconditionally on each drive and doesn't support the ioctl to flush the 
> cache 
> (although the function is already there).

DKIOCFLUSHWRITECACHE?

It is implemented here, for x86 ata:

http://cvs.opensolaris.org/source/xref/on/usr/src/uts/intel/io/dktp/dcdev/dadk.c#703
 
 
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