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DanT2

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DanT2

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September 9th, 2008 10:00

Locating the correct LUN

I need to unbind a LUN on a CX-500. The LUN is one of three LUNS that are exactly the same in size and all three are on same raid group. The LUN names used on the Clariion side and the drive names on the server don't match. How can I be absolutely sure I am unbinding the correct LUN? They are all mounted on a windows server.
  • A

    AranH1

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    Posted September 9th, 2008 10:00

    Yes it will, in powerpath the disk number is the disk number as the host sees it. operting systems cannot see the physical disks used to create LUNs. A host will only see the logical disk presented to it.
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    DanT2

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    Posted September 9th, 2008 10:00

    AranH,

    All three LUNS share the same raid group i.e, same disks. So that won't help me.

    Thanks
  • A

    AranH1

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    Posted September 9th, 2008 10:00

    If you have powerpath you can also determine which disk numbers are associated with which clariion LUN number.
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    dynamox

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    Posted September 9th, 2008 10:00

    download inq utility ..and then run inq -clariion_wwn ..or something of that nature. It will display LUN's WWN. Then you can verify that with what you see in Navisphere.
  • AW

    Allen Ward

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    Posted September 9th, 2008 10:00

    It shouldn't matter what drives/RAID group the LUNs are on. If you have a current version of PowerPath it will tell you the LUN ID associated with the drive number that Windows assigned to the LUN.
  • K

    Kumar_A

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    Posted September 9th, 2008 10:00

    If you have Navisphere Agent installed on the server, then Navisphere Manager will show the physical drive number (\\.\physicaldriveXX) alongside the LUN number in the GUI.
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    dynamox

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    Posted September 9th, 2008 10:00

    if you run powermt display you will see \\.\Physical# number and a corresponding "Navisphere" LUN number. The \\.\Physical# is the drive number you see in Disk Administrator.
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    DanT2

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    Posted September 9th, 2008 11:00

    Thanks Aran. You are right, I did powermt display and the 'harddisk' number and the \\\physicalDrive number on Navisphere match. That does it!

    Thank you all.
  • N

    nandas

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    Posted September 9th, 2008 12:00

    That's great. However, a small request - please make them feel happy by marking their answers as Correct and Helpful - this will also help to find the correct answer on future Powerlink or Support Forum search.
    Cheers,
    Sandip
  • A

    AranH1

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    Posted September 9th, 2008 12:00

    Glad we could help...

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