On Thu, 19 Mar 2009 04:03:37 -0700 Tim Small <tim@xxxxxxxxxxxxxxxx> wrote: > Hello, > > I've been configuring SATA link power management > (Documentation/scsi/link_power_management_policy.txt) on servers which > use software RAID for a while, but I happened to come across this in the > ICH9 datasheet: > > " > For reliable device removal notification while in AHCI operation without > the use of interlock switches (surprise removal), interface power > management should be disabled for the associated port. See Section 7.3.1 > of the AHCI Specification for more information. > " > > > Is this actually an issue from a libata point of view? Do I need to > ensure that link power management is disabled prior to hot-removal, and > if so, I suppose link_power_management_policy.txt should be updated to > reflect this... Hi, Yes - this is an issue. Right now we disable hotplug when link power management is enabled because when your link is in a lower power state it cannot detect the phy state changes. Most platforms I've seen do not support the interlock switches - so ATM link pwr management and hotplug are mutually excludive. I agree that the documentation should reflect this - would you like to submit a patch to the link_power_management_policy.txt file? Thanks! Kristen -- 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
