Trying to configure iSCSI multipath

Grievous wrote:

I read the docs you linked, and I've personally configured MPIO for use with iSCSI on the ReadyNAS. You need to connect to the NAS, add the iSCSI support like I mentioned, and then make the second connection with the initiator while checking the enable multipath box on the connect to target page. You can't manually add device hardware ID's after enabling iSCSI support and in server 2008 R2 you should see "MSFT2005iSCSIBusType_0x9" on the MPIO devices page. edit: By the way, as I recall data protection manager requires the use of dynamic disks, you should consider reading the following post and it applies to more than just the ReadyNAS: viewtopic.php?f=126&t=46169

Adding the second connection that way results in 2 disk seen by the disk manager, one being offline. Exactly as if the disks are not seen as MPIOed.
The link you posted is pretty old, and refers to something that doesn't apply to the problem I described, so I think you didn't even read my post.
To recap:
- I am referring to Windows Server 2008R2
- I DO connect the iSCSI volume via single path and MCS
- It FAILS to connect via MPIO, because the MPIO driver does not catch the device to be MPIOed. The process is described in the docs I posted, just read them.
- In any case, using single connection or MCS, the disk is correctly mounted at boot, DPM sees it ok, but during heavy load backups the NAS crashes and does not even responds to ping. I assume you know ping probes are not related to supposed offlining of disks. I have to POWER CYCLE the ReadyNAS to have it working, until the next backup of course. The same behaviour was proved with 4.2.17 and 4.2.19T4.
- The test with MPIO was to see if in that configuration the NAS can resist a backup
- The same DPM machines have MPIOed iSCSI connections to _real_ SANs, where they complete heavy load backup (sustained 200 mb/s full 2x1Gbit) without hassle.

The main problem is to have DPM to complete a backup on ReadyNAS. It only survives slow or small (some megs) ones.