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We have a LUN 0 that I cant seem to get rid of on CX300
Ill start by saying that I am not very familiar with this unit. We have a CX300, a CX 3-10 and another SAN from a different company. Our original unit is tghe CX300. We have moved all the volumes off this unit over time to the CX3-10 and then some have moved to our latest SAN. The CX3-10 is working fine. But when we started to use the CX300 again, every computer that we zone out the the unit shows a LUN0 with no space off the bat. This is withou even sharing anything out to the computer from the CX300. So for example, we have a AIX box that our developers wanted a 100 gig and a 300 gig volume pointed to. When we did, we got 3 volumes, the last 2 showing the correct space given, and the first unmanagable with I am assuming 0 space. Since Im not too familiar with the AIX system but Ive been creating space on all our windows servers for the last year or two, I decided to test with a windows box. Same thing. As soon as I zone it out, this 0 sized volume shows up under disk management.
We did have a raid group 0 and a Lun 0 inside the CX300 yesterday that we wiped out but upon rezoneing to the windows box, the same thing showed up there. Any help would be appreciated. This unit can be wiped clean as nothing is pointed to it.
We did have a raid group 0 and a Lun 0 inside the CX300 yesterday that we wiped out but upon rezoneing to the windows box, the same thing showed up there. Any help would be appreciated. This unit can be wiped clean as nothing is pointed to it.
RyanP2
261 Posts
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July 8th, 2009 12:00
Primus emc65060:
A SCSI-3 (SCC-2) term defined as "the logical unit number that an application client uses to communicate with, configure and determine information about an SCSI storage array and the logical units attached to it. The LUN_Z value shall be zero." In the CLARiiON context, LUNz refers to a fake logical unit zero presented to the host to provide a path for host software to send configuration commands to the array when no physical logical unit zero is available to the host. When Access Logix is used on a CLARiiON array, an agent runs on the host and communicates with the storage system through either LUNz or a storage device. On a CLARiiON array, the LUNZ device is replaced when a valid LUN is assigned to the HLU LUN0 by the Storage Group. The agent then communicates through the storage device. The user will continue, however, to see DGC LUNz in the Device Manager.
LUNz has been implemented on CLARiiON arrays to make arrays visible to the host OS and PowerPath when no LUNs are bound on that array. When using a direct connect configuration, and there is no Navisphere Management station to talk directly to the array over IP, the LUNZ can be used as a pathway for Navisphere CLI to send Bind commands to the array.
LUNz also makes arrays visible to the host OS and PowerPath when the host¿s initiators have not yet ¿logged in to the Storage Group created for the host. Without LUNz, there would be no device on the host for Navisphere Agent to push the initiator record through to the array. This is mandatory for the host to log in to the Storage Group. Once this initiator push is done, the host will be displayed as an available host to add to the Storage Group in Navisphere Manager (Navisphere Express).
LUNz should disappear once a LUN zero is bound, or when Storage Group access has been attained.
To turn on the LUNz behavior on CLARiiON arrays, you must configure the "arraycommpath." See solutions emc61303 and emc53292.
-Ryan
DonPatt
3 Posts
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July 8th, 2009 13:00
It worked like a charm on the IBM server.
I presented 2 luns, 0 and 1 and after waiting for the transitioning to finish, I refreshed on the IBM with the cfgmgr command and those same 2 are there. I think I'm good to go. Thanks again.
RyanP2
261 Posts
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July 8th, 2009 14:00
Officially I welcome you to the forums.
P.S. Instead of the drink can I have the correct answer points?
DonPatt
3 Posts
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July 8th, 2009 18:00
nandas
1.5K Posts
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July 8th, 2009 20:00
In this case, you did perfectly right - the Thread is marked Answered and also Ryan's post is marked as the "Correct" answer - you may see the thread to have the "Correct" icon against that answer.
Warm welcome to the EMC support forums from all of us - hope you find this useful and also contribute to help others from your experience and expertise.
Cheers,
Sandip
RRR
5.7K Posts
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July 9th, 2009 03:00
RyanP2
261 Posts
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July 9th, 2009 07:00
I'm just making sure that if another person comes in and sees this thread that they understand my answer was the correct one...
And if the points helps me get out of the basement of the leaderboard, then so be it
RRR
5.7K Posts
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July 9th, 2009 08:00