From: hch@lst.de (Christoph Hellwig)
Subject: [PATCH 0/3] Provide more fine grained control over multipathing
Date: Thu, 31 May 2018 18:36:03 +0200 [thread overview]
Message-ID: <20180531163603.GC30954@lst.de> (raw)
In-Reply-To: <f084e3bc-77af-4268-c882-7b0737e45f3b@grimberg.me>
On Thu, May 31, 2018@11:37:20AM +0300, Sagi Grimberg wrote:
>> the same host with PCI NVMe could be connected to a FC network that has
>> historically always been managed via dm-multipath.. but say that
>> FC-based infrastructure gets updated to use NVMe (to leverage a wider
>> NVMe investment, whatever?) -- but maybe admins would still prefer to
>> use dm-multipath for the NVMe over FC.
>
> You are referring to an array exposing media via nvmf and scsi
> simultaneously? I'm not sure that there is a clean definition of
> how that is supposed to work (ANA/ALUA, reservations, etc..)
It seems like this isn't what Mike wanted, but I actually got some
requests for limited support for that to do a storage live migration
from a SCSI array to NVMe. I think it is really sketchy, but if
doable if you are careful enough. It would use dm-multipath, possibly
even on top of nvme multipathing if we have multiple nvme paths.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: Mike Snitzer <snitzer@redhat.com>, Christoph Hellwig <hch@lst.de>,
Johannes Thumshirn <jthumshirn@suse.de>,
Keith Busch <keith.busch@intel.com>,
Hannes Reinecke <hare@suse.de>,
Laurence Oberman <loberman@redhat.com>,
Ewan Milne <emilne@redhat.com>,
James Smart <james.smart@broadcom.com>,
Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>,
Linux NVMe Mailinglist <linux-nvme@lists.infradead.org>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
Martin George <marting@netapp.com>,
John Meneghini <John.Meneghini@netapp.com>
Subject: Re: [PATCH 0/3] Provide more fine grained control over multipathing
Date: Thu, 31 May 2018 18:36:03 +0200 [thread overview]
Message-ID: <20180531163603.GC30954@lst.de> (raw)
In-Reply-To: <f084e3bc-77af-4268-c882-7b0737e45f3b@grimberg.me>
On Thu, May 31, 2018 at 11:37:20AM +0300, Sagi Grimberg wrote:
>> the same host with PCI NVMe could be connected to a FC network that has
>> historically always been managed via dm-multipath.. but say that
>> FC-based infrastructure gets updated to use NVMe (to leverage a wider
>> NVMe investment, whatever?) -- but maybe admins would still prefer to
>> use dm-multipath for the NVMe over FC.
>
> You are referring to an array exposing media via nvmf and scsi
> simultaneously? I'm not sure that there is a clean definition of
> how that is supposed to work (ANA/ALUA, reservations, etc..)
It seems like this isn't what Mike wanted, but I actually got some
requests for limited support for that to do a storage live migration
from a SCSI array to NVMe. I think it is really sketchy, but if
doable if you are careful enough. It would use dm-multipath, possibly
even on top of nvme multipathing if we have multiple nvme paths.
next prev parent reply other threads:[~2018-05-31 16:36 UTC|newest]
Thread overview: 104+ 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 ` 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 12:53 ` Johannes Thumshirn
2018-05-25 13:47 ` Mike Snitzer
2018-05-25 13:47 ` Mike Snitzer
2018-05-31 8:17 ` Sagi Grimberg
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 ` Johannes Thumshirn
2018-05-25 12:53 ` [PATCH 3/3] nvme multipath: add dev_attr_mpath_personality Johannes Thumshirn
2018-05-25 12:53 ` Johannes Thumshirn
2018-05-25 13:05 ` [PATCH 0/3] Provide more fine grained control over multipathing Christoph Hellwig
2018-05-25 13:05 ` Christoph Hellwig
2018-05-25 13:58 ` Mike Snitzer
2018-05-25 13:58 ` Mike Snitzer
2018-05-25 14:12 ` Christoph Hellwig
2018-05-25 14:12 ` Christoph Hellwig
2018-05-25 14:50 ` Mike Snitzer
2018-05-25 14:50 ` Mike Snitzer
2018-05-29 1:19 ` Martin K. Petersen
2018-05-29 1:19 ` Martin K. Petersen
2018-05-29 3:02 ` Mike Snitzer
2018-05-29 3:02 ` Mike Snitzer
2018-05-29 7:18 ` Hannes Reinecke
2018-05-29 7:18 ` Hannes Reinecke
2018-05-29 7:22 ` Johannes Thumshirn
2018-05-29 7:22 ` Johannes Thumshirn
2018-05-29 8:09 ` Christoph Hellwig
2018-05-29 8:09 ` Christoph Hellwig
2018-05-29 9:54 ` Mike Snitzer
2018-05-29 9:54 ` Mike Snitzer
2018-05-29 23:27 ` Mike Snitzer
2018-05-29 23:27 ` Mike Snitzer
2018-05-30 19:05 ` Jens Axboe
2018-05-30 19:05 ` Jens Axboe
2018-05-30 19:59 ` Mike Snitzer
2018-05-30 19:59 ` Mike Snitzer
2018-06-04 6:19 ` Hannes Reinecke
2018-06-04 6:19 ` Hannes Reinecke
2018-06-04 7:18 ` Johannes Thumshirn
2018-06-04 7:18 ` Johannes Thumshirn
2018-06-04 12:59 ` Christoph Hellwig
2018-06-04 12:59 ` Christoph Hellwig
2018-06-04 13:27 ` Mike Snitzer
2018-06-04 13:27 ` Mike Snitzer
2018-05-31 2:42 ` Ming Lei
2018-05-31 2:42 ` Ming Lei
2018-05-30 21:20 ` Sagi Grimberg
2018-05-30 21:20 ` Sagi Grimberg
2018-05-30 22:02 ` Mike Snitzer
2018-05-30 22:02 ` Mike Snitzer
2018-05-31 8:37 ` Sagi Grimberg
2018-05-31 8:37 ` Sagi Grimberg
2018-05-31 12:37 ` Mike Snitzer
2018-05-31 12:37 ` Mike Snitzer
2018-05-31 16:34 ` Christoph Hellwig
2018-05-31 16:34 ` Christoph Hellwig
2018-06-01 4:11 ` Mike Snitzer
2018-06-01 4:11 ` Mike Snitzer
2018-05-31 16:36 ` Christoph Hellwig [this message]
2018-05-31 16:36 ` Christoph Hellwig
2018-05-31 16:33 ` Christoph Hellwig
2018-05-31 16:33 ` Christoph Hellwig
2018-05-31 18:17 ` Mike Snitzer
2018-05-31 18:17 ` Mike Snitzer
2018-06-01 2:40 ` Martin K. Petersen
2018-06-01 2:40 ` Martin K. Petersen
2018-06-01 4:24 ` Mike Snitzer
2018-06-01 4:24 ` Mike Snitzer
2018-06-01 14:09 ` Martin K. Petersen
2018-06-01 14:09 ` Martin K. Petersen
2018-06-01 15:21 ` Mike Snitzer
2018-06-01 15:21 ` Mike Snitzer
2018-06-03 11:00 ` Sagi Grimberg
2018-06-03 11:00 ` Sagi Grimberg
2018-06-03 16:06 ` Mike Snitzer
2018-06-03 16:06 ` Mike Snitzer
2018-06-04 11:46 ` Sagi Grimberg
2018-06-04 11:46 ` Sagi Grimberg
2018-06-04 12:48 ` Johannes Thumshirn
2018-06-04 12:48 ` Johannes Thumshirn
2018-05-30 22:44 ` Mike Snitzer
2018-05-30 22:44 ` Mike Snitzer
2018-05-31 8:51 ` Sagi Grimberg
2018-05-31 8:51 ` Sagi Grimberg
2018-05-31 12:41 ` Mike Snitzer
2018-05-31 12:41 ` Mike Snitzer
2018-06-04 21:58 ` Roland Dreier
2018-06-04 21:58 ` Roland Dreier
2018-06-05 4:42 ` Christoph Hellwig
2018-06-05 4:42 ` Christoph Hellwig
2018-06-05 22:57 ` Roland Dreier
2018-06-05 22:57 ` Roland Dreier
2018-06-06 9:51 ` Christoph Hellwig
2018-06-06 9:51 ` Christoph Hellwig
2018-06-06 9:32 ` Sagi Grimberg
2018-06-06 9:32 ` Sagi Grimberg
2018-06-06 9:50 ` Christoph Hellwig
2018-06-06 9:50 ` Christoph Hellwig
2018-05-25 14:22 ` Johannes Thumshirn
2018-05-25 14:22 ` Johannes Thumshirn
2018-05-25 14:30 ` Christoph Hellwig
2018-05-25 14:30 ` Christoph Hellwig
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