[dm-devel] [multipath] SCSI device capacity mess
Bryan Henderson
hbryan at us.ibm.com
Wed Oct 27 18:51:42 UTC 2004
>In addition verifying the size and stuff it could also check that the
>paths really (still) point to the same device (by storing the LUN WWN in
>the hw_handler context, for example)
Just to eliminate any ambiguity here, using terminology from the
standards: A LUN is a logical unit number. A WWN is a fibre channel port
or node name. There's no such thing as a LUN WWN. I presume you mean to
check the logical unit device identifier, which is the world wide unique
and persistent identifier of a logical unit. (That's what you get (among
other things) from Page 0x83 of the SCSI VPD read from the LU).
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