On 3/27/26 4:41 AM, Benjamin Marzinski wrote:
Some older SCSI devices return a SCSI-2 style vpd page 0x83, instead of
a SPC-2/3 format one. The SCSI-2 page 83 format returns an IEEE WWN in
binary encoded hexi-decimal in the 16 bytes following the initial
4-byte page 83 reply header.
Check the 7th byte of the vpd page 83 buffer to determine whether this
is a SCSI-2 or SPC-2/3 confomant one. Byte 7 is the 3rd byte of first
Identification descriptor in a SPC-2/3 confromant vpd page 83. This is a
reserved field, and is guaranteed to be 0. If it is not zero, then it is
likely the 3rd byte of a SCSI-2 Identifier (The first 3 bytes of the ID
are the Organizationally Unique Identifier). Both the sg_inq and scsi_id
commands handle vpd page 83 this way. To make sure that the WWID which
multipath reads directly from the device matches, it should handle this
format as well.
Out of curiosity. Did you run into a specific old device that triggered this,
or was this found by code inspection ?
