Found 0 changer(s) usable by the ‘amandabackup’ user

This article is for Amanda Enterprise (AE)

Issue Symptoms

This article is for Amanda Enterprise (AE)
Issue Symptoms
Found 0 changer(s) usable by the 'amandabackup' user
Unable to use changer device '/dev/sg0', because the 'amandabackup' user lacks read and/or write access.
Ignoring changer device '/dev/sg1', because no drives found in 'mtx status' output for this changer device.
Unable to use changer device '/dev/sg2', because the 'amandabackup' user lacks read and/or write access.
Ignoring changer device '/dev/sg3', because no drives found in 'mtx status' output for this changer device.
Issue Description
The Zmanda Management Console is not able to find or detect any changer devices attached to the backup server.
Resolution
The first thing to check is whether the OS for the backup server is correctly seeing the changer device. The best way to do this is to run the system command "lsscsi". If this command is not already installed on your backup server, it can typically be quickly installed as a package of the same name.
Run lsscsi with the "-g" option and look for a "mediumx" device that fits the make and model of your changer device:
lsscsi -g
Note the /dev/sg* device that is associated with your changer device. If the changer device is not seen in the output, see your changer documentation for getting the system to correctly see the device.
If the changer device is associated with the /dev/sg3 device name, for instance, ensure that the amandabackup user has correct access to this device by checking the attributes of the /dev/sg3 device name and the groups that the amandabackup user belongs to:
ls -l /dev/sg3
id amandabackup
If you make any changes to the amandabackup user account for it to have proper access to the changer device, restart ZMC services as the root user:
/etc/init.d/zmc_aee restart
Once the amandabackup user can correctly access the changer device and ZMC services have been restarted as needed, ZMC should now be able to correctly detect the changer device and show it in the drop down menu for Tape Changer on the Admin| Devices page.

Issue Description

The Zmanda Management Console is not able to find or detect any changer devices attached to the backup server.

Resolution

The first thing to check is whether the OS for the backup server is correctly seeing the changer device. The best way to do this is to run the system command “lsscsi“. If this command is not already installed on your backup server, it can typically be quickly installed as a package of the same name.

Run lsscsi with the “-g” option and look for a “mediumx” device that fits the make and model of your changer device:

lsscsi -g

Note the /dev/sg* device that is associated with your changer device. If the changer device is not seen in the output, see your changer documentation for getting the system to correctly see the device.

If the changer device is associated with the /dev/sg3 device name, for instance, ensure that the amandabackup user has correct access to this device by checking the attributes of the /dev/sg3 device name and the groups that the amandabackup user belongs to:

ls -l /dev/sg3
id amandabackup

If you make any changes to the amandabackup user account for it to have proper access to the changer device, restart ZMC services as the root user:

/etc/init.d/zmc_aee restart

Once the amandabackup user can correctly access the changer device and ZMC services have been restarted as needed, ZMC should now be able to correctly detect the changer device and show it in the drop down menu for Tape Changer on the Admin| Devices page.

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