Re: [PATCH 22/30] multipath: Implement 'property' blacklist

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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...

Cheers,

Hannes
--
Dr. Hannes Reinecke		      zSeries & Storage
hare@xxxxxxx			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)

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