Hi Matthias - Nothing like noflushd is implemented in darwin/os x. It's certainly an "interesting" idea. I know far too little about linux power management, so I'm not sure how easily this concept would convert. Note than, in OS X, disk spindown requests originate and execute within the kernel. There's not as much user-space interaction as I perceive linux has. If you want to get started, checkout these opensource projects from cvs and start grepping. These are pointers to driver-level power management code. If you want to add hooks into the filesystem to prevent spin-up, check xnu/bsd/vfs(?). Disk specific power management: IOATABlockStorage IOSCSIArchitectureModelFamily General kernel power management code (which all device drivers inherit): xnu Files: xnu/iokit/Kernel/IOServicePM.cpp see IOService::setIdleTimerPeriod() and IOService::start_PM_idle_timer() I started this email with the intention of going into moderate detail about how this works, but I'm too tired. If you're seriously interested in implementing noflushd, get looking at the code and write back with specific questions. I'm happy to help. So GET HACKING :) -ethan On Sunday, December 1, 2002, at 09:29 am, Matthias Kretschmer wrote: Hello! I was thinking about the noflushd project (http://noflushd.sourceforge.net/) and thought, this should be possible for darwin, too. The logic for suppressing write access to the hdd should be easy if proper asynchron write is implemented. I wouldn't say to port noflushd, but implement some other simple tool which handles this (of course if it is less work to port :) ). So but this needs fundamental support from the kernel. I don't really know where to begin to look at. Or is something like this already implemented? -- Greetings Matthias Kretschmer _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.