From: hch@lst.de (Christoph Hellwig)
Subject: [PATCH 0/3] Provide more fine grained control over multipathing
Date: Fri, 25 May 2018 16:30:58 +0200 [thread overview]
Message-ID: <20180525143058.GA26391@lst.de> (raw)
In-Reply-To: <20180525142217.zedv7hz6ov6s45qk@linux-x5ow.site>
On Fri, May 25, 2018@04:22:17PM +0200, Johannes Thumshirn wrote:
> But Mike's and Hannes' arguments where reasonable as well, we do not
> know if there are any existing setups we might break leading to
> support calls, which we have to deal with. Personally I don't believe
> there are lot's of existing nvme multipath setups out there, but who
> am I to judge.
I don't think existing setups are very likely, but they absolutely
are a valid reason to support the legacy mode. That is why we support
the legacy mode using the multipath module option. Once you move
to a per-subsystem switch you don't support legacy setups, you
create a maze of new setups that we need to keep compatibility
support for forever.
> So can we find a middle ground to this? Or we'll have the
> all-or-nothing situation we have in scsi-mq now again. How about
> tieing the switch to a config option which is off per default?
The middle ground is the module option. It provides 100% backwards
compatibility if used, but more importantly doesn't create hairy
runtime ABIs that we will have to support forever.
prev parent reply other threads:[~2018-05-25 14:30 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-25 12:53 [PATCH 0/3] Provide more fine grained control over multipathing Johannes Thumshirn
2018-05-25 12:53 ` [PATCH 1/3] nvme: provide a way to disable nvme mpath per subsystem Johannes Thumshirn
2018-05-25 13:47 ` Mike Snitzer
2018-05-31 8:17 ` Sagi Grimberg
2018-05-25 12:53 ` [PATCH 2/3] nvme multipath: added SUBSYS_ATTR_RW Johannes Thumshirn
2018-05-25 12:53 ` [PATCH 3/3] nvme multipath: add dev_attr_mpath_personality Johannes Thumshirn
2018-05-25 13:05 ` [PATCH 0/3] Provide more fine grained control over multipathing Christoph Hellwig
2018-05-25 13:58 ` Mike Snitzer
2018-05-25 14:12 ` Christoph Hellwig
2018-05-25 14:50 ` Mike Snitzer
2018-05-29 1:19 ` Martin K. Petersen
2018-05-29 3:02 ` Mike Snitzer
2018-05-29 7:18 ` Hannes Reinecke
2018-05-29 7:22 ` Johannes Thumshirn
2018-05-29 8:09 ` Christoph Hellwig
2018-05-29 9:54 ` Mike Snitzer
2018-05-29 23:27 ` Mike Snitzer
2018-05-30 19:05 ` Jens Axboe
2018-05-30 19:59 ` Mike Snitzer
2018-06-04 6:19 ` Hannes Reinecke
2018-06-04 7:18 ` Johannes Thumshirn
2018-06-04 12:59 ` Christoph Hellwig
2018-06-04 13:27 ` Mike Snitzer
2018-05-31 2:42 ` Ming Lei
2018-05-30 21:20 ` Sagi Grimberg
2018-05-30 22:02 ` Mike Snitzer
2018-05-31 8:37 ` Sagi Grimberg
2018-05-31 12:37 ` Mike Snitzer
2018-05-31 16:34 ` Christoph Hellwig
2018-06-01 4:11 ` Mike Snitzer
2018-05-31 16:36 ` Christoph Hellwig
2018-05-31 16:33 ` Christoph Hellwig
2018-05-31 18:17 ` Mike Snitzer
2018-06-01 2:40 ` Martin K. Petersen
2018-06-01 4:24 ` Mike Snitzer
2018-06-01 14:09 ` Martin K. Petersen
2018-06-01 15:21 ` Mike Snitzer
2018-06-03 11:00 ` Sagi Grimberg
2018-06-03 16:06 ` Mike Snitzer
2018-06-04 11:46 ` Sagi Grimberg
2018-06-04 12:48 ` Johannes Thumshirn
2018-05-30 22:44 ` Mike Snitzer
2018-05-31 8:51 ` Sagi Grimberg
2018-05-31 12:41 ` Mike Snitzer
2018-06-04 21:58 ` Roland Dreier
2018-06-05 4:42 ` Christoph Hellwig
2018-06-05 22:57 ` Roland Dreier
2018-06-06 9:51 ` Christoph Hellwig
2018-06-06 9:32 ` Sagi Grimberg
2018-06-06 9:50 ` Christoph Hellwig
2018-05-25 14:22 ` Johannes Thumshirn
2018-05-25 14:30 ` Christoph Hellwig [this message]
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