Re: targetcli and fibre channel multipathing

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Hello Nab,

* Thomas Glanzmann <thomas@xxxxxxxxxxxx> [2013-10-09 21:43]:
> Hello Nab,

> > >   | | o- lun1 ......................................... [/dev/md126 (1.8TiB) write-thru activated]
> > >   o- qla2xxx ........................................................................ [Targets: 2]
> > >   | o- naa.210000e08b885aa6 ........................................................... [gen-acls]
> > >   | | o- acls .......................................................................... [ACLs: 1]
> > >   | | | o- naa.2100001b322f021a ................................................. [Mapped LUNs: 1]
> > >   | | |   o- mapped_lun0 .................................................. [lun0 block/lun1 (rw)]
> > >   | | o- luns .......................................................................... [LUNs: 1]
> > >   | |   o- lun0 ........................................................ [block/lun1 (/dev/md126)]
> > >   | o- naa.210100e08ba85aa6 ........................................................... [gen-acls]
> > >   |   o- acls .......................................................................... [ACLs: 1]
> > >   |   | o- naa.2100001b320f021a ................................................. [Mapped LUNs: 1]
> > >   |   |   o- mapped_lun0 .................................................. [lun0 block/lun1 (rw)]
> > >   |   o- luns .......................................................................... [LUNs: 1]
> > >   |     o- lun0 ........................................................ [block/lun1 (/dev/md126)]

> looking at the configuration it looks like that the same LUN is exported
> using _two_ different naa. The problem here is that VMware stores a
> checksum of the inquiry data on the VMFS and ignores a path to a volume
> if the SCSI inquiry data do _not_ match. Why? Because it could be a two
> week old snapshot and using it a as a multipathing target would be
> fatal.

sorry I should have double checked. This are the naa the of the hab the
storage is presented too not the naa of the LUN itself, so that is not
it.

Cheers,
        Thomas
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