[ovirt-users] Moving from fc based to iSCSI based

[Fred Rolland]

I don't think it will work.
We rely heavily on LVM when working with iSCSI and FC and I am not sure how
LVM will handle this kind of operation.
A storage domain is a VG that contains PVs (LUNS), and each disk is a LV.

On Wed, Mar 8, 2017 at 6:02 PM, Gianluca Cecchi <gianluca.cecchi at gmail.com>
wrote:

> On Wed, Mar 8, 2017 at 3:33 PM, Fred Rolland <frolland at redhat.com> wrote:
>
>> I cannot think of another option other to have an export domain in the
>> middle that can be accessed from all the hosts.
>>
>>
>> On Wed, Mar 8, 2017 at 3:50 PM, Gianluca Cecchi <
>> gianluca.cecchi at gmail.com> wrote:
>>
>>> On Wed, Mar 8, 2017 at 1:30 PM, Fred Rolland <frolland at redhat.com>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> Storage domains are per Data Center, and all hosts in this DC should be
>>>> able to access the SDs, no matter in which cluster they are...
>>>>
>>>> Are you sure your hosts are on the same DC ?
>>>>
>>>> Thanks,
>>>>
>>>> Freddy
>>>>
>>>>
>>> No, my scenario was a planning workflow.
>>> At this moment I only have Host1 and Host2 that are connected to an
>>> FC-SAN.
>>> I have to move data to an iSCSI storage and also oVirt hosts to Host3
>>> and Host4 (yet to be deployed).
>>> So I'm trying to understand if I can do it in pieces bypassing
>>> export/import
>>>
>>> I forgot that it is DC the constraint for SD accessibility.
>>> Any suggestion to accomplish the desired target?
>>>
>>> Thanks,
>>> Gianluca
>>>
>>>
>>
> Is it realistic to think something similar to the workflow described
> below, based on the import storage domain functionality described here:
> http://www.ovirt.org/develop/release-management/features/
> storage/importstoragedomain
>
> and in particular one of its targets:
> Transfer VMs between setups without the need to copy the data into and out
> of the export domain.
>
>
> Prerequisite:
> - Host1 has network connectivity with Host3
> - Host1 is part of a DC that contains an FC based storage domain, composed
> of SAN LUN A of X Tb
> - Host3 is part of another DC and has connection in place with iSCSI LUN B
> of X Tb
>
> Workflow:
> - Stop the VMs that are on the source FC domain
> - Put source storage domain into maintenance
> - Detach source storage domain
> - Clone LUN A to LUN B at low level
> (eg dd command via network
> Similar to when you clone an entire disk from a server to another
> server....
> )
> - import domain on DC where Host3 lives giving the correct iSCSI
> parameters...
>
> Do the OVF_STORE disks on the storage domain contain information about the
> fact of it being an FC or an iSCSI storage domain, preventing then a
> possible import operation?
>
> This is a test environment where I would like to transfer 4Tb of data from
> FC SAN in decommission phase to an iSCSI SAN, and if I can by-pass export /
> import phases, even giving some downtime, would be good.
>
> Thanks for reading,
> Gianluca
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20170309/44908808/attachment.html>