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saranraj456
2 Iron

Windows 2008 Drive Letter missing frequently (Showing as no data in it)

Hi Guys,

We have an weird issue in Windows 2008 Server , where 4 to 5  Drive Letter missing ( out of 28 LUNs) , with inaccessible state. Details are below

Array Details: Clarrion & VNX ( issue is only from Clariion) - three different arrays - two are clarriion and one is VNX

Host:Windows 2008 R2 Sp1

Powerpath : 5.5

Flare version:4.30.000.5.526

But after LUN remapping or server reboot , Drives become normal . However , some times when we unmap and remap, a another new LUN/Drive will experience the same behavior.

Note: All the LUNs are used as a windows share mount point.

Screen Shot 2017-02-09 at 4.39.33 PM.png

Even on disk management , Drive was showing without a mount point letter and fully non-utilized.

I am not sure , what could be the problem from storage side.

Thanks

Saran

Labels (2)
7 Replies
kelleg
5 Tungsten

Re: Windows 2008 Drive Letter missing frequently (Showing as no data in it)

This may be due to PowerPath and when it sees the disks. Try saving the PowerPath configuration once all the disks are assigned correctly on the host. See the PowerPath User Manual and look for saving the configuration.

glen

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saranraj456
2 Iron

Re: Windows 2008 Drive Letter missing frequently (Showing as no data in it)

Disk was visible in powerpath level, However, Windows drive letter /configuration was missing and changed into an unreadable state.

0 Kudos
kelleg
5 Tungsten

Re: Windows 2008 Drive Letter missing frequently (Showing as no data in it)

This sounds like a PowerPath issue - try posting your question in the PowerPath forum.

glen

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saranraj456
2 Iron

Re: Windows 2008 Drive Letter missing frequently (Showing as no data in it)

Sure , I can move to Powerpath queue, but is there any evidence /clue for it to say so

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kelleg
5 Tungsten

Re: Windows 2008 Drive Letter missing frequently (Showing as no data in it)

The array does not change the Host LUN Number once it's set so the Windows driver letter is assigned when the host boots and it enumerates the bus - the HLU number of the LUN on the array is then matched to the drive letter that's kept in the PowerPath config - if it's not saved, then the order may be off - this is PowerPath and not the array.

glen

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saranraj456
2 Iron

Re: Windows 2008 Drive Letter missing frequently (Showing as no data in it)

There is no HLU change, even at the power path level LUNs are visible without any issues . That's why skeptical , how powerpath could add an impact to this situation.

Thanks
Saran

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kelleg
5 Tungsten

Re: Windows 2008 Drive Letter missing frequently (Showing as no data in it)

If the drives are still showing up in PowerPath, but not in Explorer, then to me that would point to Windows. Have you checked on the Clariion arrays to see if there are any Event messages to indicate errors at the array level?

glen

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