it4i-disk-usage

Included it4i-disk-usage command to storage section. Please merge to master and publish

docs.it4i/anselm/storage.md

@@ -156,39 +156,35 @@ The SCRATCH filesystem is realized as Lustre parallel filesystem and is availabl
 
 ### Disk Usage and Quota Commands
 
-User quotas on the file systems can be checked and reviewed using following command:
+Disk usage and user quotas can be checked and reviewed using following command:
 
 ```console
-$ lfs quota dir
+$ it4i-disk-usage
 ```
 
-Example for Lustre HOME directory:
-
-```console
-$ lfs quota /home
-Disk quotas for user user001 (uid 1234):
-    Filesystem kbytes   quota   limit   grace   files   quota   limit   grace
-         /home 300096       0 250000000       -    2102       0 500000    -
-Disk quotas for group user001 (gid 1234):
-    Filesystem kbytes   quota   limit   grace   files   quota   limit   grace
-        /home 300096       0       0       -    2102       0       0       -
-```
-
-In this example, we view current quota size limit of 250GB and 300MB currently used by user001.
-
-Example for Lustre SCRATCH directory:
+Example:
 
 ```console
-$ lfs quota /scratch
-Disk quotas for user user001 (uid 1234):
-     Filesystem kbytes   quota   limit   grace   files   quota   limit   grace
-          /scratch       8       0 100000000000       -       3       0       0       -
-Disk quotas for group user001 (gid 1234):
- Filesystem kbytes quota limit grace files quota limit grace
- /scratch       8       0       0       -       3       0       0       -
+$ it4i-disk-usage -h
+# Using human-readable format
+# Using power of 1024 for space
+# Using power of 1000 for entries
+
+Filesystem:    /home
+Space used:    112G
+Space limit:   238G
+Entries:       15k
+Entries limit: 500k
+
+Filesystem:    /scratch
+Space used:    0
+Space limit:   93T
+Entries:       0
+Entries limit: 0
 ```
 
-In this example, we view current quota size limit of 100TB and 8KB currently used by user001.
+In this example, we view current size limits and space occupied on  the /home and /scratch filesystem, for a particular user executing the command.
+Note that limits are imposed also on number of objects (files, directories, links, etc...) that are allowed to create.
 
 To have a better understanding of where the space is exactly used, you can use following command to find out.