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--- guide:connect [2019/07/04 09:38]
ccrosby [Transferring Files]
+++ guide:connect [2026/06/18 19:45] (current)
ccrosby [Connecting to the CHPC]
@@ Line 2: / Line 2: @@
 The CHPC hosts a supercomputer comprising:
-    * 1008 regular compute nodes with 24 cores and 128 GiB of RAM each; and
+    * 1008 regular compute nodes with 24 cores and 128 GiB of RAM each;
-    * 5 large memory nodes with 56 cores 1TiB of RAM each
+    * 360 regular computes nodes with 24 cores and 64 GiB of RAM each;
+    * 4 large memory nodes with 56 cores and 1TiB of RAM each;
+    * 9 [[guide:gpu|GPU]] nodes.
-The cluster will be augmented in the future with:
-  * a GPU-powered visualisation node; and
-  * other specialised servers
 =====Host Name=====
@@ Line 24: / Line 23: @@
 ===== Dedicated scp.chpc.ac.za =====
-A dedicated node, ''**scp.chpc.ac.za**'' is available for large or long-running file transfers:
+A dedicated node, ''**scp.chpc.ac.za**'' is available for scp file transfers:
 <code>
-  scp src.tar.gz username@scp.chpc.ac.za:~/scratch/
+  scp src.tar.gz username@scp.chpc.ac.za:~/lustre/
 </code>
@@ Line 32: / Line 31: @@
 ===== Transferring Files =====
-Use scp or sftp to transfer files to or from your home directory on the CHPC systems.  For example
+**Large data sets should be transferred by means of [[howto:globus|Globus]].  Globus is faster and more reliable than scp.**
+You can also use scp or sftp to transfer files to or from your home directory on the CHPC systems.  For example
 <code>
   scp src.tar.gz username@scp.chpc.ac.za:~/lustre/
@@ Line 99: / Line 100: @@
 </code>
 to allow other users to view your files.
+====ssh error: REMOTE HOST IDENTIFICATION HAS CHANGED!====
+This error occurs if the keys used by the host are different from that used last time you connected to it.
+You can use
+  ssh-keygen -R badhost
+to remove all keys associated with the host //badhost// from your ''known_hosts'' file.
+This is safe to do because the new host key entry will be added back in next time you ssh in.
+If you want to look at or edit the ''.ssh/known_hosts'' file, it is located in the ''.ssh'' sub-directory within your home directory on the //Lengau// cluster.
+For example, after logging in:
+<code bash>
+cd .ssh/
+ls
+authorized_keys  id_ecdsa  id_ecdsa.pub  known_hosts
+</code>
+Once you have changed into the ''.ssh'' sub-directory you can then use an editor (e.g. ''nano known_hosts'') to edit the file and delete the bad line.

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