Jeff Garzik wrote: > Shane Huang wrote: >> 1. If users unplug one SATA HDD(no-root partition) or SATA ODD when >> the system is running, then plug it back to the same SATA port, >> Should the system and SATA HDD/ODD still work well? > > Yes. To add a bit, libata hotplug has grace time of at least 15secs. If the same device is plugged out and then plugged in in that time, libata considers that the device and/or connection has suffered transient failure and assumes it's the same device and there's no modification to its content. This means that if you disconnect a harddrive, write to it and then connect it back in the grace period corruption will occur. It will be fun to have some sort of competition to actually do this. :-) >> These questions come up when our QA test our SB700 SATA drivers, >> but I don't know the SATA hotplug support in linux 2.6. >> Is there any guy who can give some official confirmation? :-) > > The main thing of note with regards to hotplug is that the associated > device (/dev/sdb, /dev/scd0, etc.) may change between plug and unplug. > For example, if you unplug a SATA HDD then plug it back in, the user > might see /dev/sdb disappear, and /dev/sdd appear -- even if it is the > exact same HDD, on the exact same port. Yeah, using LABEL and/or UUID is a good idea. In the future, it will be nice to have persistent block device name as netdevices do. -- 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
