On Monday 20 December 2004 20:23, Tom Vier wrote: > I was under the impression that they were on by default. I wish this was > documented somewhere; it's very important and i bet a LOT of sysadmins don't > even consider the problems of having write-back caching enabled. At least > most scsi drives come with it disabled by default. There's only wb support > for ata and sata, fwih, too. > > A quick grep didn't help me find if there's any other barrier mode other > than flush. It looked like reiserfs had support specifically for flush mode. > I would have thought it'd be done just as a call to something like blkwb(). > > > > What about software raid? Are the barriers pushed through the raid layer?
It seems so. Have a look at the kernel 2.6.9 changelog. -- lg, Chris
