[one-users] Import iscsi images

Sun Apr 15 04:35:22 PDT 2012

Hi Jaime,

thanks for your reply, and you clarification.

I have been busy trying to debug my 3.4 installation. I was using 3.2 and decided to start from scratch to avoid upgrade issues. The host are running centos 6 64 bit. They have the same configuration that was working with 3.2.

Let me first explain what I understood so far:

- I register a VM image with IQN: xxx
- I then deploy a VM with said IQN
- when the VM is created (deployed) the iscsi target is logged in on the host and a link is created in a directory in a progressive number on the host 

The problem is when I deploy a VM from sunstone the machine is deployed on the host as follows (in this example the VM is deployed as "one-3":
[root at phoebe ~]# ps -ef | grep one-3
oneadmin 17830     1  4 13:24 ?        00:00:21 /usr/libexec/qemu-kvm -S -M rhel6.2.0 -cpu qemu32 -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -name one-3 -uuid b1134d7a-b11f-a209-8b09-38a8d9d28304 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/one-3.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -netdev tap,fd=27,id=hostnet0,vhost=on,vhostfd=28 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:b7:cd:86,bus=pci.0,addr=0x3 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:3 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4

Francesco

Francesco Camisa
Vice Direttore Generale
Policlinico San Marco
via Zanotto 40
30173 Mestre-VE
Italy

----- Original Message -----
From: "Jaime Melis" <jmelis at opennebula.org>
To: "Francesco Camisa" <francesco.camisa at policlinicosanmarco.it>
Cc: users at lists.opennebula.org
Sent: Thursday, 12 April, 2012 6:40:25 PM
Subject: Re: [one-users] Import iscsi images

Hello Francesco, 

yes you can. The key is to use SOURCE=<your_iqn> in the image template instead of using PATH. 

Keep in mind that you need to be careful with the oneimage delete action. If you do oneimage delete, this snippet of code will get called: 
https://github.com/OpenNebula/one/blob/release-3.4/src/datastore_mad/remotes/iscsi/rm 

RM_COMMAND=$(cat <<EOF 
$SUDO $(tgtadm_target_delete "$TID") 
$SUDO $LVREMOVE -f $VG_NAME/$LV_NAME 
EOF 
) 
log "Removing $DST_HOST:$DEV from the image repository" 
ssh_exec_and_log "$DST_HOST" "$RM_COMMAND" \ 
"Error removing $DST_HOST:$DEV" Which would fail. I suggest you can either substitute the iscsi/rm file with an a simple 'exit 0' and manually delete the image. Or you could modify it to really remove your device, which would be the best approach. 

Also, I think it would be wise to substitute iscsi/mkfs with 'exit 1' so it will always fail since it won't be supported either (this will be called when doing 'oneimage create' for a TYPE = DATABLOCK image). Or same as before you could modify the script to really create an empty datablock. The same applies for the iscsi/cp command ('oneimage create' when using PATH). You could also modify it to really create an equallogic device. 

If you do adapt the iscsi drivers to really take action on equallogic devices, so you can create a new image, an empty datablock and delete images, please let us know so we can upload the code to the ecosystem. The files you need to modify are: 
https://github.com/OpenNebula/one/blob/release-3.4/src/datastore_mad/remotes/iscsi/rm 

https://github.com/OpenNebula/one/blob/release-3.4/src/datastore_mad/remotes/iscsi/cp 
https://github.com/OpenNebula/one/blob/release-3.4/src/datastore_mad/remotes/iscsi/mks 

If you need any extra help adapting the drivers we will be happy to help you out. 

Cheers, 
Jaime 

On Thu, Apr 12, 2012 at 5:55 PM, Francesco Camisa < francesco.camisa at policlinicosanmarco.it > wrote: 
> Hi, 
> 
> I have installed 3.4. I have read the documentation regarding the iscsi datastore and I understand that it is tightly integrated with tgt. We don't use tgt but equallogic devices. 
> 
> I was wondering if it's possible to add a pre-existing target via sunstone or oneimage providing the target ip and the iqn. 
> 
> Thanks in advance 
> 
> Francesco 
> 
> Francesco Camisa 
> Vice Direttore Generale 
> Policlinico San Marco 
> via Zanotto 40 
> 30173 Mestre-VE 
> Italy 
> 
> _______________________________________________ 
> Users mailing list 
> Users at lists.opennebula.org 
> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org 

-- 
Jaime Melis 
Project Engineer 
OpenNebula - The Open Source Toolkit for Cloud Computing 
www.OpenNebula.org | jmelis at opennebula.org 