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From: John Garry <john.g.garry@oracle.com>
To: Hannes Reinecke <hare@suse.com>,
	hch@lst.de, kbusch@kernel.org, martin.petersen@oracle.com,
	james.bottomley@hansenpartnership.com, bmarzins@redhat.com
Cc: jmeneghi@redhat.com, linux-nvme@lists.infradead.org,
	sagi@grimberg.me, axboe@fb.com, linux-scsi@vger.kernel.org,
	michael.christie@oracle.com, snitzer@kernel.org,
	dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org,
	nilay@linux.ibm.com
Subject: Re: [PATCH 6/8] scsi: scsi-multipath: Maintain sdev->access_state
Date: Tue, 10 Mar 2026 15:54:14 +0000	[thread overview]
Message-ID: <0b5cc8e5-9e20-4675-8600-5c265fb2744e@oracle.com> (raw)
In-Reply-To: <c7a62f70-8a69-426e-9947-d2363a124583@suse.com>

On 10/03/2026 13:27, Hannes Reinecke wrote:
>> However, preferred_path is still not maintained as that that is related
>> to transitioning  state and we do not yet support that (for SCSI
>> multipath).
>>
> There is an issue with the preferred path in general, namely that it 
> overlays the ALUA states (ie you can have 'acive/non-optimized' _and_
> the preferred path bit set). So it only makes sense for explicit ALUA
> as then the preferred path bit gives us an indicator that we might /
> should switch paths.
> 
> If we restrict ourselves to implicit ALUA (which I'm advocating anyway
> for scsi-multipath) the preferred path becomes rather pointless as
> we cannot influence path selection at all.

ok, fine, I won't touch for native scsi multipath.

Thanks

  reply	other threads:[~2026-03-10 15:54 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-10 11:49 [PATCH 0/8] scsi-multipath: Basic ALUA support John Garry
2026-03-10 11:49 ` [PATCH 1/8] libmultipath: add mpath_call_for_all_devices() John Garry
2026-03-10 11:49 ` [PATCH 2/8] scsi: scsi_dh_alua: Do not attach for SCSI native multipath John Garry
2026-03-10 11:49 ` [PATCH 3/8] scsi: scsi_dh_alua: Pass submit_rtpg() a bool for extended header support John Garry
2026-03-10 11:49 ` [PATCH 4/8] scsi: Create a core ALUA driver John Garry
2026-03-14  4:35   ` Benjamin Marzinski
2026-03-16  9:12     ` John Garry
2026-03-10 11:49 ` [PATCH 5/8] scsi: scsi-multipath: Add basic ALUA support John Garry
2026-03-10 13:23   ` Hannes Reinecke
2026-03-10 15:52     ` John Garry
2026-03-10 17:54       ` Hannes Reinecke
2026-03-10 18:13         ` John Garry
2026-03-14  4:48   ` Benjamin Marzinski
2026-03-16  9:25     ` John Garry
2026-03-10 11:49 ` [PATCH 6/8] scsi: scsi-multipath: Maintain sdev->access_state John Garry
2026-03-10 13:27   ` Hannes Reinecke
2026-03-10 15:54     ` John Garry [this message]
2026-03-10 11:49 ` [PATCH 7/8] scsi: scsi-multipath: Issue a periodic TUR per path John Garry
2026-03-10 13:34   ` Hannes Reinecke
2026-03-10 17:21     ` John Garry
2026-03-10 11:49 ` [PATCH 8/8] scsi: scsi-multipath: Add stubbed scsi_multipath_dev_rescan() John Garry

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