On Fri, Jan 18, 2013 at 9:27 AM, Ewan D. Milne <emilne@xxxxxxxxxx> wrote: > This patch set adds changes to the SCSI mid-layer, sysfs and scsi_debug > to provide enhanced support for Unit Attention conditions, as well as > detection of reported sense data overflow conditions and some changes > to sense data processing. It also adds a uevent when the reported > capacity changes on an sd device. > > There was some discussion about this a couple of years ago on the linux-scsi > mailing list: http://marc.info/?l=linux-scsi&m=129702506514742&w=2 > Although one approach is to send all SCSI sense data to a userspace daemon > for processing, this patch set does not take that approach due to the > difficulty in reliably delivering all of the data. An interesting UA > condition might not be delivered due to a flood of media errors, for example. > > The mechanism used is to flag when certain UA ASC/ASCQ codes are received > that report asynchronous changes to the storage device configuration. > An appropriate uevent is then generated for the scsi_device or scsi_target > object. An aggregation mechanism is used to avoid generating uevents at > too high a rate, and to coalesce multiple UAs reported by LUNs on the > same target for a REPORTED LUNS DATA HAS CHANGED sense code. Does this patch series add a function that allows SCSI LLDs to report AEN data to the SCSI core ? What if a SCSI target reports a LUN inventory change via AER to e.g. the iSCSI initiator and that initiator ignores the AEN data ? Will that result in AEN data being ignored and no automatic LUN rescanning ? Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
