SUMMARY: SCSI devices with identical WWID

From: Tobias Nygren (tnn_at_netilium.org)
Date: 08/14/04

  • Next message: Joachim Jaeckel: "SUMMARY: Problems with Patch Kit 4 and Java" 
    Date: Sat, 14 Aug 2004 13:48:08 +0200
To: tru64-unix-managers@ornl.gov

    Many thanks to Thomas Blinn for his explanation of what's going on.
    It turns out that devices that report WWID capability but do not ensure
    WWID uniqueness violate relevant SCSI standards. The reason CAM fails
    is simply because it was designed to be used with Working disks.

    Generally running LSM & AdvFS on such devices is not recommended,
    since they both rely heavily on WWID.

    However, with this newfound knowledge I managed to google a solution
    posted two years ago by Jay Nash. This is perfectly fine for me since
    it is a testbed system.

    # Add this to /etc/ddr.dbase, run ddr_config -c
    # Force CAM to use BTL WWID.

    SCSIDEVICE
      Type = disk
      Name = "CSC" # Your nasty vendor goes here.
        ATTRIBUTE:
          AttributeName = "VPDinfo"
            Length = 16
            ubyte[1] = 1
            ubyte[5] = 15 

    --
Tobias Nygren
tnn@netilium.org
  • Next message: Joachim Jaeckel: "SUMMARY: Problems with Patch Kit 4 and Java"