diff --git a/_toc.yml b/_toc.yml
index da731145..1f7c1621 100644
--- a/_toc.yml
+++ b/_toc.yml
@@ -125,6 +125,7 @@ chapters:
           - file: infrastructure-guide/sysdb_server
           - file: infrastructure-guide/puppet01
           - file: infrastructure-guide/repo_server
+          - file: infrastructure-guide/sync_server
           - file: infrastructure-guide/lxweb00
           - file: infrastructure-guide/login
           - file: infrastructure-guide/influx00
diff --git a/infrastructure-guide/infrastructure_systems.md b/infrastructure-guide/infrastructure_systems.md
index 3362f63b..8e4dda95 100644
--- a/infrastructure-guide/infrastructure_systems.md
+++ b/infrastructure-guide/infrastructure_systems.md
@@ -4,12 +4,10 @@ List of systems and their primary role:
 
 __Core Infrastructure:__
 * [boot.psi.ch](boot_server)  - TFTP server for PXE booting
-
 * [sysdb.psi.ch](sysdb_server) - Runs sysdb, providing the dynamic iPXE, Grub and kickstart files
-
-* [puppet01](puppet01) - puppet.psi.ch - 129.129.160.118 - Runs the puppet server for the RHEL7 infra
-
+* [puppet.psi.ch](puppet01) - puppet.psi.ch - 129.129.160.118 - Runs the puppet server for the RHEL7 infra
 * [repos.psi.ch](repo_server) - RPM/Yum repository server for RHEL7/8/...
+* [lx-sync-01.psi.ch](sync_server) - System to mirror external yum repositories / packages / ...
 
 * [lxweb00](lxweb00) - http://linux.web.psi.ch - 129.129.190.46 - Exports further repositories from AFS
 
diff --git a/infrastructure-guide/sync_server.md b/infrastructure-guide/sync_server.md
new file mode 100644
index 00000000..f8208845
--- /dev/null
+++ b/infrastructure-guide/sync_server.md
@@ -0,0 +1,18 @@
+# lx-sync-01
+This server mirrors and synchronize the YUM repositories to our infrastructure. It is the only server that has write access to NFS volume hosting holding the data of our repositories.
+
+## Howto
+
+### Copy/Deploy ISOs
+This is how to manually copy ISOs to 
+
+1. Place iso on the PSI scratch drive
+2. On lx-sync-01 temporarily mount the scratch drive
+    ```
+    mount.cifs -ouser=ebner //scratch0/scratch /mnt
+    ```
+3. copy over iso's
+4. Umount scratch:
+    ```
+    umount /mnt
+    ```