Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: [linux-lvm] Re: [Announce] device-mapper beta3 (fast snapshots) | From | Alan Cox <> | Date | 17 Jul 2002 12:46:14 +0100 |
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On Wed, 2002-07-17 at 11:31, Joe Thornber wrote: > On Tue, Jul 16, 2002 at 01:27:24PM -0400, Chris Mason wrote: > > Some IDE drives ignore commands to turn off the write back cache, or > > turn it back on when load gets high. > > I'm amazed hardware manufacturers would dare to do such a thing - I > guess I'm naive.
Its not explicitly against the spec. Some of them also like to make "cache flush" a no-op too. The next generation of ATA is supposed to add explicit "direct to media" write command facilities
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