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--- guide:lustre [2020/04/30 10:42]
kevin
+++ guide:lustre [2021/12/09 16:42] (current)
@@ Line 1: / Line 1: @@
 ======The Lustre Parallel File System======
+:!: There is a new Lustre parallel file system mounted on ''/mnt/lustre3p''.  The old Lustre on ''/mnt/lustre'' will be decommissioned after 1 June 2021 and so **//you must copy over the files you will need by// 31 May 2021.** See the [[howto:datamigration|data migration how to]] for more information and guidance on how to copy your data.
 =====Lustre on Lengau=====
+Lengau has 16 OSSs arranged in pairs.  There are 28 OSTs connected to the 8 pairs.  Each OST has an approx. capacity of 115 GiB giving a total Lustre storage of 3PiB.
 =====Lustre tools=====
-The main tool for information on the files and directories of a Lustre file system is ''lfs''.
+The main tool for displaying information on the files and directories of a Lustre file system is ''lfs''.
 ====Searching====
@@ Line 36: / Line 45: @@
 To change the default striping applied to files in a sub-directory to 2 (and only applied to files larger than 1G)
-  lfs setstripe -c 2  -s 1g <dirname>
+  lfs setstripe -c 2  -s 1G <dirname>
+> Check this ^^^.
+**Note:**
+  *When you change the settings for an existing file, the file will actually only change to the new striping when it is recreated.
+  * The same applies when you change the settings for an existing directory. You will need to rename the directory, create a new directory with the new stripe settings, and then **copy** (not move) the files to the new directory to inherit the new settings.
+See ''lfs migrate'' for more.

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