On Wed, 2013-01-23 at 17:19 -0700, Bart Van Assche wrote: > On Fri, Jan 18, 2013 at 9:27 AM, Ewan D. Milne <emi...@redhat.com> 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 ?
Well, what the patch series does is add handling in scsi_check_sense(), so any sense processing that went through that path would be handled. I don't think this would apply to AEN, however. The only AEN handling that I am aware of was in iscsi-initiator-utils, in userspace, which did a rescan on the iscsi session when a 3F 0E code was received. > > Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
