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Typically this has been seen when a migration activity from one set of disks to another set of disks has occurred. However there are other causes. PowerPath for Windows displays harddisk?? in the PowerPath GUI or in powermt display dev=all. The device is visible at the HBA level and also at the MPIO level.
It would appear that the Windows LDM is somehow compromised.
Make sure that the file powermt.custom or powermt.custom.xml is removed (deleted) from the c:\program files\EMC\powercommon or c:\program files\EMC\PowerPath folders (depending on version of PowerPath) before carrying out any of the below options. Option 1 - any of these steps may provide a resolution however if these do not then Option 2 or Option 3 will need to be carried out. 1) Remove powermt.custom.xml file and Reboot. 2) Scan for hardware changes in device manager. 3) powermt check reconfig Option 2 1) Remove the suspect device(s) from visibility from the host. 2) Open a command prompt (right click and Run as Administrator).: Then run the following 2 commands in the command prompt: Set devmgr_show_nonpresent_devices=1 Start devmgmt.msc This will open the device manager. 3) Select Menu item "View" "Show Hidden devices". 4) Expand the disk section of the tree. 5) Right click and uninstall all of the greyed out disk devices (including all PowerPath devices). 6) When complete reboot. 7) Make the device(s) visible to the host again. 8) Scan for hardware changes in device manager. Option 3 1) Remove all external devices from visibility from the host. Note: If the host is Boot from SAN then the boot device will by necessity need to be kept visible to the host down the primary boot path. 2) Uninstall PowerPath and reboot. 3) Open a command prompt (right click and Run as Administrator): Then run the following 2 commands in the command prompt: Set devmgr_show_nonpresent_devices=1 Start devmgmt.msc This will open the device manager 4) Select Menu item "View" "Show Hidden devices" 5) Expand the disk section of the tree. 6) Right click and uninstall all of the greyed out disk devices (including all PowerPath devices). 7) When complete reboot. 8) Make the devices visible to the host again. 9) Install PowerPath and reboot.
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