fix: minor improvement to parsing disk space

backend/scripts/storage.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Returns used and free disk space of all machines in the cluster
+# Returns total and used disk space (in GB) of all machines in the cluster
-# Example output: steffe8 9.2G 47G
+# Example output: steffe16 8.9 47
 
-parallel --nonall --slf /home/rock/macchine.txt 'echo $HOSTNAME $(df -Ph | grep mmcblk0p5 | awk '\''{print $3" "$4}'\'')'
+parallel --nonall --slf /home/rock/macchine.txt 'echo $HOSTNAME $(df -Ph | grep mmcblk0p5 | awk '\''{print $2" "$3}'\'' | sed '\''s/G//g'\'')'