Expand MetaLUN in Navisphere

I have a Clariion CX300 that has several LUNs and MetaLUNs.  I recently cleared all the data off of a LUN that I now want to reallocate.  If I expand one of my metaLUNs by using the expansion wizard in Navisphere, it will not harm the data already existing on the MetaLUN I am expanding, correct?  I will be using concantination.
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marrjAsked:
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Duncan MeyersCommented:
That's correct. If you do a metaLUN stripe expansion, the data is re-striped across all available disks, and the extra space won't be available until the restripe complees - which can take several days. If you do a concatenated expansion, the data is left where it is, and the additional space is tacked on the end of the existing LUN. The new space is available immediately.

Don't forget to run diskpart in Windows to make the extra space available to the OS.
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marrjAuthor Commented:
How do I get the LUN out of the old storage group?  Do I simply unbind it?  It says that data loss will occur.  That is fine if it is only on the LUN I am taking out of the group.
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marrjAuthor Commented:
I just tried it and it won't let me because it is attached to a storage group.  Do I need to use the migrate feature?  I just want to make the LUN available for use by other hosts in other storage groups.
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Duncan MeyersCommented:
If the LUN that you want to expand into is in a storage group, then, yes, the expansion will fail - after all, you're overwriting what is in the LUN that you are expanding into. Remove the expansion component from the storage group and you'll be OK. The host OS will probably complain a bit, but if you do a Rescan from Disk Management, it should be happy enough.

If you want to present a LUN to multiple storage groups, select "All LUNs" from the drop-down box in the Select LUNs tab in the Storage Group properties. You'll see a warning which you can click through - it warns you not to expose a LUN to multiple servers unless your file system is up to the job (VMware VMFS - definitely **not** NTFS)) or you have clustering enabled on the hosts (such as MSCS), or you'll corrupt the file system.
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marrjAuthor Commented:
Ok.  I did what you said and it worked great.  Everything was fine for a couple of days.  Now PowerPath is complaining on the host.  I though I had this fixed.  I have tried to remove the disk from the config and I have tried to update the host from Navisphere through the agent.  It was fine until just a few minutes ago.  Now it won't let me remove the disk.  Any ideas?  Am I going to have to reinstall PowerPath?
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Duncan MeyersCommented:
Can you post a screenshot of the PowerPath screen please? Can you navigate down the tree in the left-hand through the array, then click on the disks - that will show all paths to the disks.
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marrjAuthor Commented:
Here you go.
Powerpath.JPG
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Duncan MeyersCommented:
That looks a bit odd...

Try this:

From Windows Device Manager, scan for new devices
From Windows Disk Management, Rescan Disks
then for a command prompt, powermt remove dev=all - this will remove all dead devices from PowerPath management but leave the active devices alone, despite the ominous-looking command. You may need to path into C:\Program Files\EMC\PowerPath\ to run the command.

If that doesn't clear the dead device (and it should), reboot the server.

Finally, once you've cleared the error, can you post  screen shots with Disk 001 highlighted and the two adapters highlighted please? Just want to check that all is OK as the appearance of Adapter 0 port0\path0 is a wee bit peculiar.
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marrjAuthor Commented:
I ran the command and got the following results.  PowerPath is still going crazy.  I will have to wait until after hours to reboot the server.
Powermt-command.JPG
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marrjAuthor Commented:
I just restarted the server to find that the failed path was still there and causing problems.  I was able to run the command successfully, however, after the reboot.  All looks good.  Here are the screenshots you requested.
Adapter-02.JPG
Adapter01.JPG
disk001.JPG
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Duncan MeyersCommented:
That's spot-on - PowerPath is behaving perfectly now.

Thanks for the points. Glad I could help.
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