Differences

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--- doku:vsc3_storage [2021/05/13 18:05] – [Backup Policy] goldenberg
+++ doku:vsc3_storage [2021/08/23 08:08] – [Scratch Space Usage: ''\$GLOBAL'' and ''\$SCRATCH''] goldenberg
@@ Line 24: / Line 24: @@
-==== Scratch Space Usage: ''\$GLOBAL'' and ''\$SCRATCH'' ====
-**This is decommissioned and no longer available**
-The [[http://www.beegfs.com|BeeGFS]] parallel file system (former FhGFS) on VSC-3 provides a large (initially approx. 0.5 PB) scratch space. The environment variable ''$GLOBAL'' expands to:
-<code>
-$ echo $GLOBAL
-/global/lv70999/username
-</code>
-The directory is writeable as user and readable by the group members. It is advisable to make use of these directories in particular for jobs with heavy I/O operations. In addition it will reduce the load on the fileserver holding the $HOME directories.
-The BeeGFS (former Fraunhofer parallel file system) is **shared by all users and by all nodes**.
-Single jobs producing heavy load (>>1000 requests per second) have been observed to reduce responsiveness for all jobs and all users.
-Lifetime of data is limited, see table below.
-=== Per-node Scratch Directories ''$SCRATCH'' ===
-Local scratch directories on each node are provided as a link to the BeeGFS parallel file system and can thus be viewed also via the login nodes as '''/fhgfs/nodelocal/rXXnXX/'''.
-The parallel file system (and thus the performance) is identical between $SCRATCH and $GLOBAL.
-The variable ''$SCRATCH'' expands to:
-<code>
-$ echo $SCRATCH
-/scratch
-</code>
-These directories are purged after job execution.
 ==== Usage Local Scratch RAM Disk $TMPDIR ====