What is "/dev/sr0" in Nodegrid Manager?

What is "/dev/sr0" in Nodegrid Manager?

Normally, users get access and can manage the devices connected to the Nodegrid Manager (NGM).

But, there can be a case when the users may not access the Nodegrid Manager or its managed devices properly and can get hung in between. Once the administrator logs in as root and checks for the space used in the system with df command, one can see this line in the output:

  1. /dev/sr0        580516 580516        0    100%     /run/media/sr0

Here, the fact to be understood is, /dev/sr0 is a device on the scsi controller (hypervisor). The /dev/sr0 can be also a DVD- /CD-ROM or similar. The media in there has always 100% used as it is read-only.

The /dev/sr0 in Nodegrid Manager  means the hypervisor kept a CD/DVD assigned to the VM.

Note: the /dev/sr0 does not show in any Nodegrid appliance.

When it is about mouting ISO files or device images to the sr0 file ( virtual drive ), the best one can do is unmount the drive and delete the source disc. To add the file, one should consider not finalizing and mouting it every single time as a file system.

To solve the problem,
1. Login as root in Nodegrid Manager
2. At the shell, type:

    umount /dev/sr0

It will disconnect the media and user can verify it with df command again.










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