cp error writing devshmtestrdb001 No space left on device

This error message indicates that there is no more space left on the device where the file system is mounted. The "cp" command is unable to write the file to the destination directory because it has run out of space.

To resolve this issue, you can try the following steps:

1. Check the available disk space on the device by running the "df -h" command. This will show you the usage and available space on all mounted file systems.

2. If the device is running low on space, you can free up some space by deleting unnecessary files or moving them to another location.

3. If the device is out of space, you may need to add more storage capacity or delete some files to make space.

4. If you are unable to free up space or add more storage, you may need to consider moving the file to a different location with more space available.

5. Once you have freed up enough space, retry the "cp" command