Messages in this thread | | | Date | Wed, 08 Aug 2007 11:35:32 -0400 | From | Mark Lord <> | Subject | Re: Disk spin down issue on shut down/suspend to disk |
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Mark Lord wrote: > > My suspend script now has this little chunk of code at the point > where it actually does the suspend-to-RAM: > > sync; sync > hdparm -F /dev/sda ## flush drive write cache > sleep 1 ## allow time for the flush to complete > echo mem > /sys/power/state ## suspend-to-RAM > > Without the "sleep 1", it doesn't always eliminate the extra Retract, > so I hypothesize that the FLUSH_CACHE_EXT command is implemented in > an asynchronous fashion by the drive: it returns immediately before > it has actually completed writing cached data to disk. The "sleep 1" > seems to give it enough time to finish up, at least for me.
Further to this, if I have an active-writer running at the time of suspend, then even my scripted "sleep 1" is not good enough, as additional writes are still happening before/after the flush.
Now I'll reboot and try it with the "sleep 1" hardcoded inside sd_suspend().
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