[virt-tools-list] Virtual Machine Manager not seeing iSCSI target

[Ritchie P. Fraser]

Hello list,

This issue has me (us) scratching our heads in confusion...

I am having issues connecting a virtual machine (in virtual machine manager)
with only one of the iSCSI targets even though the host server seems to have
mapped it successfully.

We have:
- Ubuntu 10.10 server (host) running QEMU KVM 0.12.5
- a Fujitsu SAN with iSCSI targets
- several iSCSI targets on the SAN

$ sudo ls -l /dev/mapper

lrwxrwxrwx 1 root root      7 2013-10-18 12:04 mpath4 -> ../dm-5
lrwxrwxrwx 1 root root      8 2013-10-18 12:04 mpath4-part1 -> ../dm-14
lrwxrwxrwx 1 root root      8 2013-10-18 12:04 mpath4-part2 -> ../dm-15
lrwxrwxrwx 1 root root      8 2013-10-18 12:04 mpath4-part3 -> ../dm-16

$ sudo multipath -ll

mpath4 (3600000e00d00000000013eed00030000) dm-5 FUJITSU ,ETERNUS_DXL
[size=20G][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=140][active]
\_ 6:0:0:3   sdg  8:96   [active][ready]
\_ 12:0:0:3  sdu  65:64  [active][ready]

I can even mount and browse the partitions successfully.

$ mount -t ext4 /dev/mapper/mpath4-part1 /mnt/part1
$ mount -t ext4 /dev/mapper/mpath4-part2 /mnt/part2
(part3 is a linux swap so I haven't tried to mount this...)


In Virtual Machine Manager:
I right click the host and selected 'Details'
Select the 'Storage' tab and the 'iscsi-mpath' pool
and hit the refresh list button...

dm-5 (see output from multipath -ll above) does not appear in the list of
available volumes.

If I try to use the CLI to add the disk...

$ sudo virsh
virsh # attach-disk tmp_marge --source /dev/mapper/mpath4 --target vda

error: Failed to attach disk
error: Requested operation is not valid: cannot attach device on inactive domain

If I then start the virtual computer (without hdd attached) and then run...

virsh # attach-disk tmp_marge --source /dev/mapper/mpath4 --target vda

Disk attached successfully

Yay!

I try rebooting the vm and I get

Error starting domain: internal error unsupported driver name 'phy' for disk
'/dev/mapper/mpath4'

Boo!

Also, if I right click the vm in Virtual Machine Manager -> Open. Click the
'i' tool bar button. Select the 'VirtIO Disk 1' I see the following information.

  Virtual Disk
    Target device: VirtIO Disk 1
    Source path: /dev/mapper/mpath4
    Storage size: Unknown
    Read Only: No
    Shareable: No

    Disk Bus: Virtio
    Serial number: blank
    Storage format: raw

    Cache mode: default
    IO mode: default

The 'Storage Size' = Unknown is worrying as this shows correctly for all the
other virtual machines using the other iSCSI targets

virsh # attach-disk tmp_marge --source /dev/mapper/mpath4 --target vda --persistent

error: Failed to attach disk
error: Requested operation is not valid: cannot modify the persistent
configuration of a domain

Kind Regards,
Ritchie Fraser
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