Ok I hear what your saying and thank you for your input! By the way this is a test environment I am working with so I can learn, so there is no risk for dual brainy-ness. Also I figured out where I was going wrong earlier on site B, I was clicking "New Domain" instead of "Import Domain" So I was able to import the replicated iSCSI domain, however now when I try to attach the storage domain, I get the following in the even log.

"VDSM jake-ovirt2 command CleanStorageDomainMetaDataVDS failed: Cannot acquire host id: ('80dcf277-9958-4368-b7dd-2a5d5d29b3ec', SanlockException(5, 'Sanlock lockspace add failure', 'Input/output error'))"

It is my opinion that my problem now is that since the data domain was not properly detached before replication, that my replicated storage will not attach because of some "lock" on the storage domain?Is that what this error means or am I missing the mark completely?



On 11/13/2018 02:41 PM, Christopher Cox wrote:
Normally a "replicate" or RAID 1 style scenario is handled by a SAN frontend (like IBM's SVC) or some other mirroring mechanism that presents an abstracted mirrored LUN as a Storage Domain to oVirt.

So, the answer lies with your storage supplier and/or SAN abstractor.

With that said, reading your full text, this would still be likely for a failover scenario and not a "live/live" scenario. A "live/live" scenarios risks the problem inherent to two things being "split brained". And this is usually very bad for non-cluster aware storage (and the complexity of cluster aware storage could be great in this case).


On 11/13/18 2:24 PM, Jacob Green wrote:
So I was testing with two Identical ovirt environments running the latest 4.2 environment. I have iscsi storage set up at Site A, and I have that same storage replicated to Side B, before I get into learning disaster recovery I wanted to see what importing the replicated storage would look like. However when I import it I get the follow, and the vms are wiped from the replicated storage I presented with iscsi.


So is this possible with iscsi? Is there another way to go about doing this?

My iscsi solution is freenas.








--
Jacob Green

Systems Admin

American Alloy Steel

713-300-5690


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