Messages in this thread | | | Subject | Re: Problem in IDE Disks cache handling in kernel 2.4.XX | From | Benjamin Herrenschmidt <> | Date | 10 Jan 2003 12:07:56 +0100 |
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On Fri, 2003-01-10 at 12:37, Alan Cox wrote:
> > And by the way how are powered off the IDE drives ? > > Because a FLUSH CACHE or STANDY or SLEEP is MANDATORY before powering off the > > drive with cache enabled or you will enjoy lost data > > IDE disagrees with itself over this but when we get a controlled power > off we do this. The same ATA5/ATA6 problem may well be present there > too. I will review both
I did fix a data loss problem with some PPC laptops that way too, that is just before shutdown and just before machine sleep, sending a STANDBYNOW command. In the case of machine sleep, I make sure not to accept any more request (mark the hwif busy) after that and until machine wake up (at which point I do a full hard reset or poweron reset of the drive).
Ben.
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