Ok, after rebooting all the hypervisors I'm left with the following errors:
Thread-16::ERROR::2015-01-21 13:39:42,644::sdc::137::Storage.StorageDomainCache::(_findDomain) looking for unfetched domain 6cf8c48e-fbed-4b68-b376-57eab3039878
Thread-16::ERROR::2015-01-21 13:39:42,644::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain) looking for domain 6cf8c48e-fbed-4b68-b376-57eab3039878
Thread-18::ERROR::2015-01-21 13:39:42,696::sdc::137::Storage.StorageDomainCache::(_findDomain) looking for unfetched domain dc662b6f-00d4-4b9a-a320-0f5ecf5da45e
Thread-18::ERROR::2015-01-21 13:39:42,698::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain) looking for domain dc662b6f-00d4-4b9a-a320-0f5ecf5da45e
Thread-15::ERROR::2015-01-21 13:39:44,349::sdc::137::Storage.StorageDomainCache::(_findDomain) looking for unfetched domain e1bbe4ab-3717-4a9a-ada2-9d175ab38262
Thread-15::ERROR::2015-01-21 13:39:44,350::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain) looking for domain e1bbe4ab-3717-4a9a-ada2-9d175ab38262
Thread-17::ERROR::2015-01-21 13:39:44,477::sdc::137::Storage.StorageDomainCache::(_findDomain) looking for unfetched domain e33afd52-812e-45f7-b45b-8b049fc0f31c
Thread-17::ERROR::2015-01-21 13:39:44,479::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain) looking for domain e33afd52-812e-45f7-b45b-8b049fc0f31c
Thread-18::ERROR::2015-01-21 13:44:44,407::sdc::137::Storage.StorageDomainCache::(_findDomain) looking for unfetched domain dc662b6f-00d4-4b9a-a320-0f5ecf5da45e
Thread-18::ERROR::2015-01-21 13:44:44,408::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain) looking for domain dc662b6f-00d4-4b9a-a320-0f5ecf5da45e
Thread-16::ERROR::2015-01-21 13:44:44,795::sdc::137::Storage.StorageDomainCache::(_findDomain) looking for unfetched domain 6cf8c48e-fbed-4b68-b376-57eab3039878
Thread-16::ERROR::2015-01-21 13:44:44,796::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain) looking for domain 6cf8c48e-fbed-4b68-b376-57eab3039878
Thread-15::ERROR::2015-01-21 13:44:45,900::sdc::137::Storage.StorageDomainCache::(_findDomain) looking for unfetched domain e1bbe4ab-3717-4a9a-ada2-9d175ab38262
Thread-15::ERROR::2015-01-21 13:44:45,901::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain) looking for domain e1bbe4ab-3717-4a9a-ada2-9d175ab38262
Thread-17::ERROR::2015-01-21 13:44:45,934::sdc::137::Storage.StorageDomainCache::(_findDomain) looking for unfetched domain e33afd52-812e-45f7-b45b-8b049fc0f31c
Thread-17::ERROR::2015-01-21 13:44:45,942::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain) looking for domain e33afd52-812e-45f7-b45b-8b049fc0f31

Kind regards,

Koen

2015-01-21 11:20 GMT+01:00 Koen Vanoppen <vanoppen.koen@gmail.com>:
Added the direct lun, so all hypervisor can see it, no effect.. Still the same error

2015-01-21 10:39 GMT+01:00 Koen Vanoppen <vanoppen.koen@gmail.com>:
I noticed that there was a difference in the number of attached LUN's between the hypervisors. This is because we have a VM with direct LUN's. Do these Lun's on this particular vm also be attached to the other hypervisors or to 1 hypervisor only?

2015-01-21 8:29 GMT+01:00 Koen Vanoppen <vanoppen.koen@gmail.com>:
Dear all,

We have a small issue on our ovirt environment. When I try to add a fibre storage pool,
I get the following error:
2015-01-21 08:24:48,705 WARN  [org.ovirt.engine.core.vdsbroker.irsbroker.IrsProxyData] (org.ovirt.thread.pool-8-thread-22) Storage domain e5d59e58-6408-4f80-911e-a30d0e7ca1fe:BuranIsoDomain is not visible to one or more hosts. Since the domains type is ISO, hosts status will not be changed to non-operational
2015-01-21 08:24:54,764 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.CreateStorageDomainVDSCommand] (ajp--127.0.0.1-8702-3) [2c666536] Command CreateStorageDomainVDSCommand(HostName = saturnus1, HostId = 1180a1f6-635e-47f6-bba1-871d8c432de0, storageDomain=StorageDomainStatic[StoragePoolOracle01, fd6c6779-8353-42f6-b2ff-0c670e4b8a73], args=qEZ3pE-03I3-5w9M-1XFN-ArBH-2d2e-fSVRF3) execution failed. Exception: VDSNetworkException: java.util.concurrent.TimeoutException
2015-01-21 08:24:54,769 ERROR [org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand] (ajp--127.0.0.1-8702-3) [2c666536] Command org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand throw Vdc Bll exception. With error message VdcBLLException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSNetworkException: java.util.concurrent.TimeoutException (Failed with error VDS_NETWORK_ERROR and code 5022)
2015-01-21 08:24:54,810 ERROR [org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand] (ajp--127.0.0.1-8702-3) [2c666536] Transaction rolled-back for command: org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand.
2015-01-21 08:24:54,839 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (ajp--127.0.0.1-8702-3) [2c666536] Correlation ID: 2c666536, Job ID: 35bc8058-ab79-40b5-be1e-877b88362261, Call Stack: null, Custom Event ID: -1, Message: Failed to add Storage Domain StoragePoolOracle01. (User: admin)
2015-01-21 08:24:55,107 WARN  [org.ovirt.engine.core.bll.AddVmFromScratchCommand] (DefaultQuartzScheduler_Worker-25)

In the GUI you'll see this error:

Error while executing action New SAN Storage Domain: Network error during communication with the Host.

All the hosts are up and all the rest of our storage is also up.

Kind regards,

Koen