Messages in this thread | | | Date | Sun, 03 Aug 2008 12:19:56 +0900 | From | Tejun Heo <> | Subject | Re: [PATCH 3/5] libata: Implement disk shock protection support |
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Alan Cox wrote: >> However, SATA or not, there simply isn't a way to abort commands in ATA. >> Issuing random command while other commands are in progress simply is >> state machine violation and there will be many interesting results >> including complete system lockup (ATA controller dying while holding the >> PCI bus). The only reliable way to abort in-flight commands are by >> issuing hardreset. However, ATA reset protocol is not designed for >> quick recovery. The machine is gonna hit the ground hard way before the >> reset protocol is complete. > > Actually you cau can issue idle immediate on older ATA devices. I am not > clear if that was stuck back into the current accelerometer friendly > drives or not. Would need to check with IBLenovo
Was that something intentional or was it a happy accident? There can be bus ownership problem on PATA and on SATA this is much more state logic on both sides of the cable and I think things like that would be more difficult to work accidentally.
Thanks.
-- tejun
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