[ovirt-users] shared storage with iscsi

[Amador Pahim]

On 12/04/2014 02:54 PM, mad Engineer wrote:
> sorry i am wrong its the data domain that stores virtual disk images,I
> have no idea how ovirt shares block device across hosts.Looks like i
> need to try that for understanding how its implemented.In case of
> vmware they uses vmfs file system for sharing block device among
> hosts.I currently have no issues with my NFS shared storage so dont
> have any plan to use iscsi,but just curious how the implementation
> is.

It's not shared considering the lowest level. Each disk corresponds to a 
LVM logical volume, which is activated only on the specific hypervisor 
running the VM. Others hypervisors cannot access the logical volume 
while the VM is not running on it (except for shared disks). To activate 
the logical volume (in order to run the VM), hypervisor runs a "lvchange 
-ay vol_group/logical_vol"

> In my existing non ovirt environment,SAN block devices is exported
> and its shared using GFS.Is ovirt using any simillar method to achieve
> shared block device.
>
>
>
> On Thu, Dec 4, 2014 at 9:10 PM, mad Engineer <themadengin33r at gmail.com> wrote:
>> Thanks Gianluca,it says only NFS is supported as export domain.I
>> believe export domain is the one i am currently using for live
>> migrating vms across hosts.So iscsi is not supported,please correct me
>> if i am wrong.Thanks for your help
>>
>> On Thu, Dec 4, 2014 at 9:00 PM, Gianluca Cecchi
>> <gianluca.cecchi at gmail.com> wrote:
>>> On Thu, Dec 4, 2014 at 4:23 PM, mad Engineer <themadengin33r at gmail.com>
>>> wrote:
>>>> Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block device
>>>> shareable across multiple hosts.Could you tell me how is it achieved
>>>> in ovirt.
>>>>
>>>> Regards
>>>>
>>> First step the admin guide:
>>> http://www.ovirt.org/OVirt_Administration_Guide
>>>
>>> and in particular the Storage chapter and the related iSCSI part:
>>> http://www.ovirt.org/OVirt_Administration_Guide#.E2.81.A0Storage
>>>
>>> Also, for multipath in case you need it:
>>> http://www.ovirt.org/Feature/iSCSI-Multipath
>>>
>>> HIH,
>>> Gianluca
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