[dm-devel] [PATCH 22/30] multipath: Implement 'property' blacklist

Bart Van Assche bvanassche at acm.org
Fri Nov 7 09:04:40 UTC 2014

On 08/21/14 21:31, Hannes Reinecke wrote:
> On 08/21/2014 06:37 PM, Bart Van Assche wrote:
>> Hannes Reinecke <hare <at> suse.de> writes:
>>> Multipath can only handle device properly which support the VPD
>>> page 0x83. Originally this was ensured by 'scsi_id', which would
>>> not present an ID_SERIAL value in these cases.
>>> With the move to udev 'ID_SERIAL' is now always present, so
>>> multipath would try to attach to _all_ SCSI devices.
>>> This patch implements an 'property' blacklist, which allows to
>>> blacklist a device based on the existence of udev properties.
>>> Any device not providing the udev property from the whitelist
>>> will be ignored.
>>> The default whitelist is set to '(ID_WWN|ID_SCSI_VPD)'.
>>> [ ... ]
>> (replying to an e-mail of one year ago)
>> Hello Hannes,
>> I have a question about this patch. Which software component should
>> set the
>> ID_SCSI_VPD parameter ? Is it udev, now integrated in systemd ? I'm
>> asking
>> this because I haven't found any patch in the udev nor in the systemd
>> repositories that sets the ID_SCSI_VPD parameter. Does this mean that
>> another parameter should be used to restore support for SCSI devices that
>> support the VPD page 0x83 but do not report a WWN in that page ? Or does
>> this mean that systemd should be modified such that it sets the
>> ID_SCSI_VPD parameter ?
> That's actually simple typo. ID_SCSI_VPD was generated by one of the
> earlier instances of the sg3_utils udev rules.
> It should read 'SCSI_IDENT_LUN', as this is what the current udev rules
> from sg3_utils generate.
> I have a patch queued in my sles12 patchset; but so far haven't found
> time to clean them up and send upstream.
> Will be doing so once sles12 is done...

(replying to an e-mail of two months ago)

Hello Hannes,

Have you already been able to free up some time to revisit what has been 
discussed above ?



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