Duplicate backing device error adding second disk (thinks it's the first disk)

[Albert Chin-A-Young]

We're running HPVM 3.5 on a 11.23/Ia system. We just upgraded from one iSCSI server to the next and are adjusting the device entries in the guest configs to adapt to the new /dev/rdsk entries.

# hpvmstatus
[Virtual Machines]
Virtual Machine Name VM #  OS Type State     #VCPUs #Devs #Nets Memory  Runsysid
==================== ===== ======= ========= ====== ===== ===== ======= ========
yukio                   12 HPUX    Off            2     4     1 8192 MB        0
maho                    13 HPUX    Off            1     2     1 4096 MB        0

# hpvmstatus -P maho

...

[Storage Interface Details]
Guest                                 Physical
Device  Adaptor    Bus Dev Ftn Tgt Lun Storage   Device
======= ========== === === === === === ========= =========================
dvd     scsi         0   1   0   0   0 file      /opt/vms/iso/hpux-11iv3-iso/092007-FOE-2.iso
disk    scsi         0   1   0   1   0 disk      /dev/rdsk/c26t0d0

# ioscan -knf C disk

Class        I  H/W Path        Driver         S/W State   H/W Type     Description
====================================================================================
disk         2  0/0/2/1.0.16.0.0  sdisk          CLAIMED     DEVICE       TEAC    DVD-ROM DW-224EV
                               /dev/dsk/c0t0d0   /dev/rdsk/c0t0d0
disk         1  0/1/1/0.0.0.0.0   sdisk          CLAIMED     DEVICE       HP      IR Volume
                               /dev/dsk/c1t0d0     /dev/rdsk/c1t0d0  
                               /dev/dsk/c1t0d0s1   /dev/rdsk/c1t0d0s1
                               /dev/dsk/c1t0d0s2   /dev/rdsk/c1t0d0s2
                               /dev/dsk/c1t0d0s3   /dev/rdsk/c1t0d0s3
disk        23  255/0/22.0.0.0  sdisk          CLAIMED     DEVICE       OI      COMSTAR
                               /dev/dsk/c27t0d0     /dev/rdsk/c27t0d0  
                               /dev/dsk/c27t0d0s1   /dev/rdsk/c27t0d0s1
                               /dev/dsk/c27t0d0s2   /dev/rdsk/c27t0d0s2
                               /dev/dsk/c27t0d0s3   /dev/rdsk/c27t0d0s3
disk        24  255/0/22.0.0.1  sdisk          CLAIMED     DEVICE       OI      COMSTAR
                               /dev/dsk/c27t0d1   /dev/rdsk/c27t0d1
disk        22  255/0/23.0.0.0  sdisk          CLAIMED     DEVICE       OI      COMSTAR
                               /dev/dsk/c26t0d0     /dev/rdsk/c26t0d0  
                               /dev/dsk/c26t0d0s1   /dev/rdsk/c26t0d0s1
                               /dev/dsk/c26t0d0s2   /dev/rdsk/c26t0d0s2
                               /dev/dsk/c26t0d0s3   /dev/rdsk/c26t0d0s3
disk        25  255/0/23.0.0.1  sdisk          CLAIMED     DEVICE       OI      COMSTAR
                               /dev/dsk/c26t0d1   /dev/rdsk/c26t0d1

# hpvmdevmgmt -l gdev
localnet:CONFIG=gdev,EXIST=YES,DEVTYPE=SWITCH,SHARE=YES::WWID_NULL
lan1:CONFIG=gdev,EXIST=YES,DEVTYPE=NIC,SHARE=NO::WWID_NULL
vm:CONFIG=gdev,EXIST=YES,DEVTYPE=SWITCH,SHARE=YES:yukio,maho:WWID_NULL
lan0:CONFIG=gdev,EXIST=YES,DEVTYPE=NIC,SHARE=NO:vm:WWID_NULL
/opt/vms/iso/hpux-11iv3-iso/092007-FOE-2.iso:CONFIG=gdev,EXIST=YES,DEVTYPE=FILE,SHARE=YES:yukio,maho:HPVM_STATID_67_1
lan2:CONFIG=gdev,EXIST=YES,DEVTYPE=NIC,SHARE=NO::WWID_NULL
/dev/rdsk/c22t0d0:CONFIG=gdev,EXIST=YES,DEVTYPE=DISK,SHARE=NO:yukio:0100-00e0-812e-78de-0000-2a00-487f-72b0
/dev/rdsk/c23t0d0:CONFIG=gdev,EXIST=YES,DEVTYPE=DISK,SHARE=NO:yukio:0100-00e0-812e-78de-0000-2a00-487f-71c8
/dev/rdsk/c25t0d0:CONFIG=gdev,EXIST=YES,DEVTYPE=DISK,SHARE=NO:yukio:6001-44f0-4acd-23cb-0000-0423-cae6-5400
/dev/rdsk/c26t0d0:CONFIG=gdev,EXIST=YES,DEVTYPE=DISK,SHARE=NO:maho:6001-44f0-5777-4b00-0000-4ebe-4190-0001

# hpvmmodify -P maho -a disk:scsi::disk:/dev/rdsk/c27t0d0
hpvmmodify: ERROR (maho): Duplicate backing device '/dev/rdsk/c26t0d0'.
hpvmmodify: ERROR (maho): Unable to add device '/dev/rdsk/c27t0d0'.
hpvmmodify: Unable to create device disk:scsi::disk:/dev/rdsk/c27t0d0.
hpvmmodify: Unable to modify the guest.

# ls -ld /dev/rdsk/c26t0d0 /dev/rdsk/c27t0d0
crw-r-----   1 bin        sys        188 0x1a0000 Nov 12 04:02 /dev/rdsk/c26t0d0
crw-r-----   1 bin        sys        188 0x1b0000 Nov 12 13:14 /dev/rdsk/c27t0d0

Seems that the system think /dev/rdsk/c26t0d0 and /dev/rdsk/c27t0d0 are the same. Why? How do I add the second disk?

[Albert Chin-A-Young · Accepted solution]

Problem was due to a configuration error on the new iSCSI file server.