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Status Not under consideration
Workspace AIX
Created by Guest
Created on Sep 26, 2017

RELATED IDEAS

Customer wants notification of when VGDA corruption occurs prior to a reboot of the system.

Action Taken:
- customer says he had vg on A and B, then they migrated to c and d and
brought it up fine.
- they a had shared luns and on one set of systems those luns had a vg
that was varied on and used. On the second set of system that had the
luns still mapped to them they accidentally added a new vg to those luns
and it corrupted the VGDA, customer says they were not notified no error
or any indication until later when the system was rebooted.
- The customer feels this is a design/code flaw and that there should
be a notification or error generated at the time of VGDA corruption
so that the user knows there is corruption.
Customer is wanting a design change request created for this
functionality to be implemented
- Due to the fact that they did not know for awhile that the VGDA
had been corrupted they continued to use the VG on the other system
until they tried to bring it down and backup was the only indication
at that point that they had a problem

Idea priority Low
  • Guest
    Reply
    |     Apr 9, 2020

    LVM already have the functionality to protect against over writing existing VG on disk.
    If a user tries to create a new volume group on a disk containing an existing volume group, mkvg prints a warning message that says the disk appears to belong to another VG and use force option to overwrite the VG. It is users responsibility to check the disk before using the force option. Local system doesn't know if someone overwrites VG/data on the disk from a different system.

  • Guest
    Reply
    |     Sep 27, 2017

    If a user tries to create a new volume group on a disk containing an existing volume group, mkvg will give them an error telling them there is already a vg on it:

    # mkvg -y testvg hdisk20
    0516-1398 mkvg: The physical volume hdisk20, appears to belong to
    another volume group. Use the force option to add this physical volume
    to a volume group.
    0516-862 mkvg: Unable to create volume group.

    The only way to create a new volume group on a disk with an existing volume group is to use the force option to mkvg (-f). In my opinion the user assumes any risk he takes using the force option, as the regular option will error out and not create the vg.

    It looks like in this customer's case the VGDA was not "corrupt", it was overwritten.

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