On 05/06/2010 10:19 PM, Mark Lord wrote: > On 06/05/10 03:49 PM, Jeff Garzik wrote: >> >>> Currently, there's no way to tell whether staggered spin up is needed >>> or drives are already spun up. > > Perhaps by issuing a "CHECK POWER MODE" command? > For many drives, a non-spinning drive is detectable from its IDENTIFY data. Heh, yeah, I wish it were like that. IIRC, there are two different staggered spin up scheme. The one implemented by CAP_SSS uses link init sequence as signal to spin up which means you don't even know whether there's a device attached before committing to spinning it up. Gotta love ATA. :-) -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
