From: Bart Van Assche <bart.vanassche@gmail.com>
To: "Ewan D. Milne" <emilne@redhat.com>
Cc: linux-scsi@vger.kernel.org
Subject: Re: [PATCH RFC 0/9] [SCSI] Enhanced sense and Unit Attention handling
Date: Wed, 23 Jan 2013 17:19:17 -0700 [thread overview]
Message-ID: <CAO+b5-oKyPoSdKJPcyaf4FkDUNH25Cwwz=_C4WiwvpfauNqStQ@mail.gmail.com> (raw)
In-Reply-To: <1358526434-1173-1-git-send-email-emilne@redhat.com>
On Fri, Jan 18, 2013 at 9:27 AM, Ewan D. Milne <emilne@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 ?
Bart.
next prev parent reply other threads:[~2013-01-24 0:19 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-18 16:27 [PATCH RFC 0/9] [SCSI] Enhanced sense and Unit Attention handling Ewan D. Milne
2013-01-18 16:27 ` [PATCH RFC 1/9] [SCSI] Detect overflow of sense data buffer Ewan D. Milne
2013-01-18 16:46 ` James Bottomley
2013-01-21 7:26 ` Hannes Reinecke
2013-01-21 8:58 ` James Bottomley
2013-01-21 17:42 ` Douglas Gilbert
2013-01-22 15:10 ` Ewan Milne
2013-01-23 7:16 ` Hannes Reinecke
2013-01-22 15:08 ` Ewan Milne
2013-01-23 10:44 ` Hannes Reinecke
2013-01-23 13:06 ` James Bottomley
2013-01-23 21:21 ` Ewan Milne
2013-01-18 16:27 ` [PATCH RFC 2/9] [SCSI] Generate uevent on sd capacity change Ewan D. Milne
2013-01-18 16:27 ` [PATCH RFC 3/9] [SCSI] Add a kernel config option for enhanced Unit Attention support Ewan D. Milne
2013-01-18 16:27 ` [PATCH RFC 4/9] [SCSI] Rename scsi_evt_xxx to sdev_evt_xxx and scsi_event to sdev_event Ewan D. Milne
2013-01-22 17:33 ` Bart Van Assche
2013-01-23 21:08 ` Ewan Milne
2013-01-22 17:38 ` Bart Van Assche
2013-01-23 20:39 ` Ewan Milne
2013-01-18 16:27 ` [PATCH RFC 5/9] [SCSI] Add support for scsi_target events Ewan D. Milne
2013-01-18 16:27 ` [PATCH RFC 6/9] [SCSI] Generate uevents for certain Unit Attention codes Ewan D. Milne
2013-01-18 16:27 ` [PATCH RFC 7/9] [SCSI] Add sysfs support for enhanced Unit Attention handling Ewan D. Milne
2013-01-18 16:27 ` [PATCH RFC 8/9] [SCSI] Add sense and Unit Attention generation to scsi_debug Ewan D. Milne
2013-01-19 18:43 ` Douglas Gilbert
2013-01-22 15:12 ` Ewan Milne
2013-01-18 16:27 ` [PATCH RFC 9/9] [SCSI] Streamline detection of FM/EOM/ILI status Ewan D. Milne
2013-01-24 0:19 ` Bart Van Assche [this message]
2013-01-24 11:38 ` [PATCH RFC 0/9] [SCSI] Enhanced sense and Unit Attention handling Hannes Reinecke
2013-01-24 14:00 ` Ewan Milne
2013-01-24 14:01 ` Mike Christie
2013-01-24 22:02 ` Ewan Milne
2013-01-24 22:47 ` Mike Christie
2013-01-24 14:38 ` Bart Van Assche
2013-01-24 14:51 ` Hannes Reinecke
2013-01-24 15:00 ` Mike Christie
2013-01-24 15:15 ` Hannes Reinecke
2013-01-24 22:00 ` Ewan Milne
2013-01-26 18:20 ` Mike Christie
2013-01-28 6:56 ` Hannes Reinecke
2013-01-28 15:05 ` Jeremy Linton
2013-01-28 15:44 ` Bart Van Assche
2013-01-28 15:48 ` Hannes Reinecke
2013-01-28 20:26 ` James Bottomley
2013-01-28 15:52 ` Jeremy Linton
2013-01-28 16:04 ` Ewan Milne
2013-01-28 16:18 ` Mike Christie
2013-01-29 5:01 ` Shyam_Iyer
2013-01-24 13:53 ` Ewan Milne
2013-01-31 16:27 ` Ewan Milne
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAO+b5-oKyPoSdKJPcyaf4FkDUNH25Cwwz=_C4WiwvpfauNqStQ@mail.gmail.com' \
--to=bart.vanassche@gmail.com \
--cc=emilne@redhat.com \
--cc=linux-scsi@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.