1207993 – worldwide name (WWN) for storage need to be uniquely identifiable

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Bug 1207993 - worldwide name (WWN) for storage need to be uniquely identifiable

Summary: worldwide name (WWN) for storage need to be uniquely identifiable

Keywords:
Status:	CLOSED WONTFIX
Alias:	None
Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	libvirt
Sub Component:
Version:	6.7
Hardware:	Unspecified
OS:	Unspecified
Priority:	medium
Severity:	medium
Target Milestone:	rc
Target Release:	---
Assignee:	Peter Krempa
QA Contact:	Virtualization Bugs
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:	1207998 1208009
TreeView+	depends on / blocked

Reported:	2015-04-01 07:29 UTC by Sibiao Luo
Modified:	2015-04-07 12:43 UTC (History)
CC List:	15 users (show)
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Clone Of:
Clones:	1207998 (view as bug list)
Environment:
Last Closed:	2015-04-07 12:43:37 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Description Sibiao Luo 2015-04-01 07:29:48 UTC

Description of problem:
worldwide name (WWN) for storage need to be uniquely identifiable. If you specified the same WWN for two storage disk, QEMU did not to refuse it and the second disk fail to be named by the /dev/disk/by-id/scsi-*.

Version-Release number of selected component (if applicable):
host info:
# uname -r && rpm -q qemu-kvm
2.6.32-548.el6.x86_64
qemu-kvm-0.12.1.2-2.462.el6.x86_64
guest info:
RHEL-Server-7.1.z-64bit

How reproducible:
100%

Steps to Reproduce:
1.launch a KVM guest with two virtio-scsi disk specified the same WWN.
e.g:...-drive file=/home/RHEL-Server-7.1.z-64bit.raw,if=none,id=drive-system-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device virtio-scsi-pci,bus=pci.0,addr=0x4,id=scsi0 -device scsi-hd,drive=drive-system-disk,id=system-disk,bus=scsi0.0,scsi-id=0,lun=0,channel=0,***wwn=0x5000c50015ea71aa***,bootindex=1 ... -drive file=/home/my-data-disk.raw,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device virtio-scsi-pci,bus=pci.0,addr=0x7,id=scsi1 -device scsi-hd,drive=drive-data-disk,id=data-disk,bus=scsi0.0,scsi-id=1,lun=0,channel=0,***wwn=0x5000c50015ea71aa***

2.check it in guest.
# ls -lh /dev/disk/by-path/*
# ls -lh /dev/sd*

Actual results:
after step 2, the second disk(sdb) fail to be named by the /dev/disk/by-id/scsi-*.
# ls -l /dev/disk/by-id/*
lrwxrwxrwx. 1 root root  9 Apr  1  2015 /dev/disk/by-id/ata-QEMU_DVD-ROM_QM00003 -> ../../sr0
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/dm-name-rhel_reserved_for_network_devices-root -> ../../dm-0
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/dm-name-rhel_reserved_for_network_devices-swap -> ../../dm-1
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/dm-uuid-LVM-Ew32qX8tCRMQeJ37Zf2VK4ZsBSMhFDaReSHWbeAfXQeZChWA9NoFsswcwMyuH3m1 -> ../../dm-0
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/dm-uuid-LVM-Ew32qX8tCRMQeJ37Zf2VK4ZsBSMhFDaRUCfYOHVx2fdRrct0irttXdhpVpYC7J0A -> ../../dm-1
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/lvm-pv-uuid-cYvCgc-x2yG-NhtJ-PfY8-CN7p-EBeK-BY4nc5 -> ../../sda2
lrwxrwxrwx. 1 root root  9 Apr  1  2015 /dev/disk/by-id/scsi-35000c50015ea71aa -> ../../sda
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/scsi-35000c50015ea71aa-part1 -> ../../sda1
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/scsi-35000c50015ea71aa-part2 -> ../../sda2
lrwxrwxrwx. 1 root root  9 Apr  1  2015 /dev/disk/by-id/wwn-0x5000c50015ea71aa -> ../../sda
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/wwn-0x5000c50015ea71aa-part1 -> ../../sda1
lrwxrwxrwx. 1 root root 10 Apr  1  2015 /dev/disk/by-id/wwn-0x5000c50015ea71aa-part2 -> ../../sda2
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<no sdb naming here>.

# ls -lh /dev/disk/by-path/*
lrwxrwxrwx. 1 root root  9 Apr  1 22:36 /dev/disk/by-path/pci-0000:00:04.0-virtio-pci-virtio1-scsi-0:0:0:0 -> ../../sda
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-path/pci-0000:00:04.0-virtio-pci-virtio1-scsi-0:0:0:0-part1 -> ../../sda1
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-path/pci-0000:00:04.0-virtio-pci-virtio1-scsi-0:0:0:0-part2 -> ../../sda2
lrwxrwxrwx. 1 root root  9 Apr  1 22:36 /dev/disk/by-path/pci-0000:00:04.0-virtio-pci-virtio1-scsi-0:0:1:0 -> ../../sdb

# ls -lh /dev/sd*
brw-rw----. 1 root disk 8,  0 Apr  1  2015 /dev/sda
brw-rw----. 1 root disk 8,  1 Apr  1  2015 /dev/sda1
brw-rw----. 1 root disk 8,  2 Apr  1  2015 /dev/sda2
brw-rw----. 1 root disk 8, 16 Apr  1  2015 /dev/sdb

# sg_inq -p 0x83 /dev/sda
VPD INQUIRY: Device Identification page
  Designation descriptor number 1, descriptor length: 21
    designator_type: vendor specific [0x0],  code_set: ASCII
    associated with the addressed logical unit
      vendor specific: drive-system-disk
  Designation descriptor number 2, descriptor length: 12
    designator_type: NAA,  code_set: Binary
    associated with the addressed logical unit
      NAA 5, IEEE Company_id: 0xc50
      Vendor Specific Identifier: 0x15ea71aa
      [0x5000c50015ea71aa]

# sg_inq -p 0x83 /dev/sdb
VPD INQUIRY: Device Identification page
  Designation descriptor number 1, descriptor length: 19
    designator_type: vendor specific [0x0],  code_set: ASCII
    associated with the addressed logical unit
      vendor specific: drive-data-disk
  Designation descriptor number 2, descriptor length: 12
    designator_type: NAA,  code_set: Binary
    associated with the addressed logical unit
      NAA 5, IEEE Company_id: 0xc50
      Vendor Specific Identifier: 0x15ea71aa
      [0x5000c50015ea71aa]

Expected results:
worldwide name (WWN) for storage need to be uniquely identifiable, QEMU should  refuse to launch the KVM with a correct prompt when specified the same WWN for the storage.

Additional info:

Comment 1 Sibiao Luo 2015-04-01 07:51:48 UTC

If specified the different WWN which worked well.

e.g:...-drive file=/home/RHEL-Server-7.1.z-64bit.raw,if=none,id=drive-system-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device virtio-scsi-pci,bus=pci.0,addr=0x4,id=scsi0 -device scsi-hd,drive=drive-system-disk,id=system-disk,bus=scsi0.0,scsi-id=0,lun=0,channel=0,wwn=0x5000c50015ea71aa,bootindex=1...-drive file=/home/my-data-disk.raw,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device scsi-hd,drive=drive-data-disk,id=data-disk,bus=scsi0.0,scsi-id=1,lun=0,channel=0,wwn=0x5000c50015ea71bb

# ls -lh /dev/disk/by-id/*
lrwxrwxrwx. 1 root root  9 Apr  1 22:36 /dev/disk/by-id/ata-QEMU_DVD-ROM_QM00003 -> ../../sr0
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/dm-name-rhel_reserved_for_network_devices-root -> ../../dm-0
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/dm-name-rhel_reserved_for_network_devices-swap -> ../../dm-1
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/dm-uuid-LVM-Ew32qX8tCRMQeJ37Zf2VK4ZsBSMhFDaReSHWbeAfXQeZChWA9NoFsswcwMyuH3m1 -> ../../dm-0
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/dm-uuid-LVM-Ew32qX8tCRMQeJ37Zf2VK4ZsBSMhFDaRUCfYOHVx2fdRrct0irttXdhpVpYC7J0A -> ../../dm-1
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/lvm-pv-uuid-cYvCgc-x2yG-NhtJ-PfY8-CN7p-EBeK-BY4nc5 -> ../../sda2
lrwxrwxrwx. 1 root root  9 Apr  1 22:36 /dev/disk/by-id/scsi-35000c50015ea71aa -> ../../sda
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/scsi-35000c50015ea71aa-part1 -> ../../sda1
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/scsi-35000c50015ea71aa-part2 -> ../../sda2
lrwxrwxrwx. 1 root root  9 Apr  1 22:36 /dev/disk/by-id/scsi-35000c50015ea71bb -> ../../sdb
lrwxrwxrwx. 1 root root  9 Apr  1 22:36 /dev/disk/by-id/wwn-0x5000c50015ea71aa -> ../../sda
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/wwn-0x5000c50015ea71aa-part1 -> ../../sda1
lrwxrwxrwx. 1 root root 10 Apr  1 22:36 /dev/disk/by-id/wwn-0x5000c50015ea71aa-part2 -> ../../sda2
lrwxrwxrwx. 1 root root  9 Apr  1 22:36 /dev/disk/by-id/wwn-0x5000c50015ea71bb -> ../../sdb

Comment 2 Paolo Bonzini 2015-04-01 10:01:06 UTC

Moving to libvirt.  QEMU doesn't do sanity checks on the virtual machine as a whole.

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