LVM empty after disconnect and reconnect?!?!

  • I have storage for my OMV to an iSCSI target. Everything working great. I thought I'd disconnect the iSCSI during the week when I'm not using the storage so the disk array can spin down (saving heat and energy).

    I first stopped the samba service so the mount isn't in use:
    service samba stop

    I then dismount the storage:
    umount /media/e6e5abfc-d17a-40fc-8641-59efccee676c

    I then logout of the iSCSI target
    iscsiadm -m node -u

    cool, the disks spin down.

    So then I reconnect:

    iscsiadm -m node -l

    but now my LVM is completely empty! The physical disks are there, but the Logical Volume Management pages are completely empty! lvscan doesn't do anything.

    WTH?!?! ?(

  • comparing my current config.xml with a backup, looks like everything is there. I'm nervous to reboot. I'd like to have some explanation as to what happened, and, whether there is some other process I should be doing to cleanly mount/dismount the iSCSI target.

  • Well, good news, reboot, and my volumes is back, though the LVM was inactive and I had to run 'lvchange'.

    This *IS* reproduceable, so clearly my procedure is NOT GOOD. So, what's the proper method I should be using to disconnect an LVM from an iSCSI target?

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