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Snapdrive for Unix

Snap connect operation fails

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The Snap connect operation fails and the original volume group does not load after rebooting the host.

On a Linux host, the Snapshot connect operation fails on an originating host if SnapDrive for UNIX is interrupted, either by rebooting the host or by using Ctrl-C. The interruption results in the #SDUTEMP tag added to the /etc/lvm/lvm.conf file; any subsequent SnapDrive for UNIX operations fail with the following error message:

0001-945 Admin error: Volume Manager's configuration file contains
tags from previous SDU operation. Please cleanup the cloned lun(s),
if any, existing from a previous unsuccessful operation and cleanup
the configuration file before proceeding.

Workaround

  1. Remove any cloned LUNs from the storage system that might exist from a previously failed or interrupted Snapshot connect operation.

    Note You can use the snapdrive storage show command with the -alloption to verify.

  2. Check if the LUN has been removed from the host by entering the following command:

    • For iSCSI, enter the command /etc/init.d/iscsi reload

      Note /etc/init.d/iscsi reload option is applicable for versions RHEL 4 update 6 and prior.

    • For RHEL 5 and later, if you are using iSCSI you have to remove LUNs manually. Also, you have to perform host rescan manually.

      If you are using multipathing solution, then perform rescan for multipathing also manually. You can do so by running the command multipath

      Note If you are using FC, then the above process applies to all the versions prior to RHEL 4 update 6 and RHEL 5 and later.

  3. Remove the volume group from the /etc/lvm/lvm.conf file.

    After removing the cloned LUNs from the /etc/lvm/lvm.conf file, the file might look as follows:

    #SDUEXISTING volume_list = [ "vgX" , "vgY" ] volume_list = [ "vgX" ] #SDUTEMP

  4. Delete the entire line containing the #SDUTEMP tag at the end. If a line exists that begins with the #SDUEXISTING tag, remove the tag only, and retain the line.

  5. Run the vgscan command to retain the changes made in the configuration file.

  6. Enter the vgchange -a y command to retain the original volume group.

  7. Execute the appropriate mount command to mount the logical volume group after reviewing the /etc/fstab file in the host to remount the file system.