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--- other:newppl:starting [2025/08/07 13:51] – [Miscellaneous information] Added link to GATE desk jypeter
+++ other:newppl:starting [2025/08/29 15:26] (current) – [Dealing with disk space] Finished rewriting the section jypeter
@@ Line 377: / Line 377: @@
     * Use the following command to access the backup: ''cd ~/.snapshot''
-  * **Quota**: YES!\\ There is a limit to what you can store in your home directory. If you reach this limit, you may experience some seemingly random errors (can't connect to the servers, the new files have a 0 size, ...)\\ The example below shows how to determine the //quota// on the LSCE disks: you can never go above the size displayed in the ''limit column'', and you cannot stay more than 7 days above the limit displayed in the ''quota'' column! The ''grace'' column will display either ''None'' (you cannot write on the disk anymore, unless you get below the ''quota'' limit) or ''N days'' (you can use the disk, but you have ''N days'' to go below the ''quota'' limit)\\ <code>
+  * **Quota**: YES!\\ There is a limit to what you can store in your home directory. If you reach this limit, you may experience some seemingly random errors (can't connect to the servers, the new files have a 0 size, ...)
- > quota -s
-Disk quotas for user johndoe (uid 6369):
-     Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
-prolix3:/users/   4658M   4883M   4981M           23503       0       0</code>
 ==== The scratch directory ====
@@ Line 413: / Line 407: @@
   * **Quota**: ask your advisor
-==== Determining the space used by directories ====
+==== Dealing with disk space ====
-Your Linux environment may sometimes stop working correctly because you have exceeded the allowed quota on your disks (check your quotas with ''quota -s''). You can use the following command to get the size of all the directories and files in the current directory, sorted by size: ''du -sh * | sort -rh''
+<WRAP center round important 60%>
+Running out of disk space may have strange (and difficult to debug) side effects!
+</WRAP>
-<code> >cd /home/scratch01/johndoe
+**Disk space** on remote servers may sometimes seems infinite, but **is a limited resource**, especially if other users are not as careful as you!
-/home/scratch01/johndoe
- >du -sh * | sort -rh
+You should regularly check how much space you are using (''quota'', ''du''), and how much space is left (''df'')
+=== 'quota' command ===
+The ''quota -s'' command will tell you:
+  * If your disk usage (total size and/or number of files) is limited on some of the disks you use
+    * It is usually the case on the //home// directories (LSCE, spirit, computing centers, ...)
+  * How much disk space you are currently using on the disks with //quota// control
+The examples below shows how to display the current //quota// on the LSCE and spirit disks:
+  * //home// quota at LSCE
+    * <code> > quota -s
+Disk quotas for user johndoe (uid 0007):
+     Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
+prolix3:/users/   4658M   4883M   4981M           23503       0       0</code>
+  * //home// quota on spiritx
+    * <code> $ quota -s
+Disk quotas for user janedoe (uid 0008):
+     Filesystem   space   quota   limit   grace   files   quota   limit   grace
+.17.3.169:/home
+K  32768M  33792M             339    400k    420k</code>
+  * The ''blocks'' or ''space'' column display your current usage of the disk where the quota is activated
+  * You can never go above the size displayed in the **//hard//** ''limit'' column
+  * You cannot stay more than 7 days above the **//soft//** limit displayed in the ''quota'' column!
+  * The ''grace'' column will display either:
+    * nothing: everything is fine!!
+    * ''N days'': you can still use this disk, but you have ''N days'' (decreasing from 7 days) to remove files and get back below the //soft// ''quota'' limit
+    * ''None'': you cannot write to this disk anymore, unless you remove files to get below the ''quota'' limit
+=== 'du' (disk usage) command ===
+You can use ''du -sh some_dir'' to determine the space used by ''some_dir'' (and all its sub-directories)
+Examples:
+  * At LSCE ''du -sh /home/users/johndoe'' will display the size of the //home// directory. It should be roughly the same value as the ''blocks'' column displayed by ''quota''
+  * You can use the following command to get the size of all the directories and files in the current directory, sorted by decreasing size:
+    * ''du -sh * | sort -rh''
+      * If you don't understand the //pipe// (''|'' character) above, read //Combining commands// in //[[#linux_unix|Useful Linux commands for working with (potentially big) text files (houchesa4_updated.pdf)]]//
+    * <code> > cd /home/scratch01/johndoe
+ > du -sh * | sort -rh
 M     GLAC1DHiceF26.nc
 M     dashboard
@@ Line 429: / Line 468: @@
 ...</code>
-FIXME Add something about ''df''
+=== 'df' command ===
+''df -h'' will display the total size of a disk, and how much space is left. A disk may be full, even if you have not reached your quota (because it is full of fools)
+Examples:
+  * <code> > df -h /home/users
+Filesystem      Size  Used Avail Use% Mounted on
+prolix3:/users  3.6T  2.1T  1.4T  60% /home/users</code>
+  * <code> >df -h /home/scratch01
+Filesystem                       Size  Used Avail Use% Mounted on
+prolix3.lsce.ipsl.fr:/scratch01   14T   13T  127G 100% /home/scratch01</code>
 ===== Which programs should you use? =====