[ovirt-users] Sharing iSCSI data stroage domain across multiple clusters in the same datacenter

[santosh]

Hi,
*
**Can we share the iSCSI data storage domain across multiple clusters in 
the same datacenter?*

Following are the setup details which I tried.

    -    One datacenter, Say DC1
    -    in DC1, two clusters, say CL1 and CL2
    -    In CL1, one host, say H1. And in CL2 one host, say H2
    -    iSCSI Data Storage domain is configured where external storage
    LUNs are exported to host H1(A host in CL1 of Datacenter).


While adding H1 to CL1 is succeeded; addition of H2 in CL2 is failing 
with following error in vdsm.log.

    Traceback (most recent call last):
       File "/usr/share/vdsm/storage/task.py", line 873, in _run
         return fn(*args, **kargs)
       File "/usr/share/vdsm/logUtils.py", line 45, in wrapper
         res = f(*args, **kwargs)
       File "/usr/share/vdsm/storage/hsm.py", line 1020, in
    connectStoragePool
         spUUID, hostID, msdUUID, masterVersion, domainsMap)
       File "/usr/share/vdsm/storage/hsm.py", line 1091, in
    _connectStoragePool
         res = pool.connect(hostID, msdUUID, masterVersion)
       File "/usr/share/vdsm/storage/sp.py", line 630, in connect
         self.__rebuild(msdUUID=msdUUID, masterVersion=masterVersion)
       File "/usr/share/vdsm/storage/sp.py", line 1153, in __rebuild
         self.setMasterDomain(msdUUID, masterVersion)
       File "/usr/share/vdsm/storage/sp.py", line 1360, in setMasterDomain
         raise se.StoragePoolMasterNotFound(self.spUUID, msdUUID)
    StoragePoolMasterNotFound: Cannot find master domain:
    'spUUID=a4dfaf64-adfa-4cfa-88d5-986fbdb2b2b2,
    msdUUID=741f7913-09ad-4d96-a225-3bda6d06e042'
    Thread-13::DEBUG::2014-07-30
    15:24:49,780::task::885::TaskManager.Task::(_run)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::Task._run:
    07997682-8d6b-42fd-acb3-1360f14860d6
    ('a4dfaf64-adfa-4cfa-88d5-986fbdb2b2b2', 2,
    '741f7913-09ad-4d96-a225-3bda6d06e042', 1, None) {} failed -
    stopping task
    Thread-13::DEBUG::2014-07-30
    15:24:49,780::task::1211::TaskManager.Task::(stop)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::stopping in state
    preparing (force False)
    Thread-13::DEBUG::2014-07-30
    15:24:49,780::task::990::TaskManager.Task::(_decref)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::ref 1 aborting True
    *Thread-13::INFO::2014-07-30
    15:24:49,780::task::1168::TaskManager.Task::(prepare)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::aborting: Task is
    aborted: 'Cannot find master domain' - code 304*
    Thread-13::DEBUG::2014-07-30
    15:24:49,781::task::1173::TaskManager.Task::(prepare)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::Prepare: aborted:
    Cannot find master domain
    Thread-13::DEBUG::2014-07-30
    15:24:49,781::task::990::TaskManager.Task::(_decref)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::ref 0 aborting True
    Thread-13::DEBUG::2014-07-30
    15:24:49,781::task::925::TaskManager.Task::(_doAbort)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::Task._doAbort: force False
    Thread-13::DEBUG::2014-07-30
    15:24:49,781::resourceManager::977::ResourceManager.Owner::(cancelAll)
    Owner.cancelAll requests {}
    Thread-13::DEBUG::2014-07-30
    15:24:49,781::task::595::TaskManager.Task::(_updateState)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::moving from state
    preparing -> state aborting
    Thread-13::DEBUG::2014-07-30
    15:24:49,781::task::550::TaskManager.Task::(__state_aborting)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::_aborting: recover
    policy none
    Thread-13::DEBUG::2014-07-30
    15:24:49,782::task::595::TaskManager.Task::(_updateState)
    Task=`07997682-8d6b-42fd-acb3-1360f14860d6`::moving from state
    aborting -> state failed
    Thread-13::DEBUG::2014-07-30
    15:24:49,782::resourceManager::940::ResourceManager.Owner::(releaseAll)
    Owner.releaseAll requests {} resources {}
    Thread-13::DEBUG::2014-07-30
    15:24:49,782::resourceManager::977::ResourceManager.Owner::(cancelAll)
    Owner.cancelAll requests {}
    Thread-13::ERROR::2014-07-30
    15:24:49,782::dispatcher::65::Storage.Dispatcher.Protect::(run)
    {'status': {'message': "Cannot find master domain:
    'spUUID=a4dfaf64-adfa-4cfa-88d5-986fbdb2b2b2,
    msdUUID=741f7913-09ad-4d96-a225-3bda6d06e042'", 'code': 304}}

_*Please advise if I need to have one Storage Domain per cluster in 
given datacenter.*_

Thanks, Santosh.




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