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DELL Power vault_MD3420 - Virtual disk not on preferred path error.

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DELL Power vault_MD3420 - Virtual disk not on preferred path error.

This question has been answered by DELL-Sam L

Hello Friends,

                         We have DELL MD3420 Power vault device with 2 SSD and 4 HDD. We've got an error message saying " Virtual disk not on preferred path". Can anyone please explain what is it ? 

Found below recovery step on the internet, 

    Redistribute virtual disks manually can fix this issue.

My doubt is that, this storage device has database running 24x7. Doing above recommandation wont distrub my database ? Whether any downtime or restart required if i Redistribute virtual disks manually ?

Please advise to clear this error.   

Verified Answer
  • Hello manicaps1,

    The alert on the system is due to a virtual disk not being on the preferred path. When virtual disks are created, they are assigned to one of the two controllers as a preferred communication path. If that path is not available – due to a network issue, controller reset, etc. – the array will communicate via the alternate controller. In some cases the communication does not shift back to the primary path when it becomes available again. To correct this you just need to manually redistribute the virtual disks back to their preferred paths.

    To redistribute virtual disks:

    1.           Open Modular Disk Storage Manager (MDSM)

    2.           Click on the Support tab

    3.           Select Manage Raid Controller Modules

    4.           Click on Redistribute Virtual Disks

    You will get an alert telling you that this will disrupt communications if you do not have the multipath drivers installed. You can ignore this message and proceed. If you still have access to the virtual disk that is not on preferred path, you have multipath drivers installed.

    Also, redistributing the virtual disk will not disturb the database as it is just moving the communication back to the owning controller of the virtual disk. There is no down time needed. If the error happens again then we may need to look at a support bundle from your MD3420 to ensure that there are no other issues.

    Please let us know if you have any other questions.

    DELL-Sam L
    Dell | Social Outreach Services - Enterprise
    Download the Dell Quick Resource Locator app today to access PowerEdge support content on your mobile device! (iOS, Android, Windows)

All Replies
  • Hello manicaps1,

    The alert on the system is due to a virtual disk not being on the preferred path. When virtual disks are created, they are assigned to one of the two controllers as a preferred communication path. If that path is not available – due to a network issue, controller reset, etc. – the array will communicate via the alternate controller. In some cases the communication does not shift back to the primary path when it becomes available again. To correct this you just need to manually redistribute the virtual disks back to their preferred paths.

    To redistribute virtual disks:

    1.           Open Modular Disk Storage Manager (MDSM)

    2.           Click on the Support tab

    3.           Select Manage Raid Controller Modules

    4.           Click on Redistribute Virtual Disks

    You will get an alert telling you that this will disrupt communications if you do not have the multipath drivers installed. You can ignore this message and proceed. If you still have access to the virtual disk that is not on preferred path, you have multipath drivers installed.

    Also, redistributing the virtual disk will not disturb the database as it is just moving the communication back to the owning controller of the virtual disk. There is no down time needed. If the error happens again then we may need to look at a support bundle from your MD3420 to ensure that there are no other issues.

    Please let us know if you have any other questions.

    DELL-Sam L
    Dell | Social Outreach Services - Enterprise
    Download the Dell Quick Resource Locator app today to access PowerEdge support content on your mobile device! (iOS, Android, Windows)

  • Thank you Mr.Sam. The issue has been fixed.