O3/CNAF/3-registration.md

@@ -9,10 +9,54 @@ Two ways to register data:
  	 register all frames in those times
  * offline: select a start time and datatype, register frames as they arrive.
 
-First, we need to set up a `diskcache` daemon.
+For this exercise, I will register data directly at CIT and transfer to CNAF.
+
 
 ## DiskCache
-Create a configuration file
+A diskcache daemon usually runs locally.  I'm not sure where that lives (or if
+it's true) at CIT, so let's just run our own instance:
+
+Create a configuration file:
+```
+[jclark@ldas-pcdev6] $ cat diskcache.rsc
+SERVER_PORT=11300
+CONCURRENCY=4
+OUTPUT_ASCII=/home/jclark/Projects/rucio-O3/CNAF/diskcache/frame_cache_dump
+OUTPUT_ASCII_VERSION=0x00FF
+OUTPUT_BINARY=/home/jclark/Projects/rucio-O3/CNAF/diskcache/.frame.cache
+LOG=diskcache
+LOG_DIRECTORY=/home/jclark/Projects/rucio-O3/CNAF/diskcache/logs
+LOG_DEBUG_LEVEL=0
+LOG_ROTATE_ENTRY_COUNT=10000
+SCAN_INTERVAL=16000
+STAT_TIMEOUT=600
+#------------------------------------------------------------------------
+# DIRECTORY_TIMEOUT
+#   Number of seconds to wait for directory calls to complete
+#   Default: 20 seconds
+#------------------------------------------------------------------------
+DIRECTORY_TIMEOUT=60
+
+[EXTENSIONS]
+.gwf
+.sft
+
+[EXCLUDED_DIRECTORIES]
+
+[MOUNT_POINTS]
+/archive/frames/ER13/hoft
+```
+
+Now start the `diskcache` as a background process.  This is easy with a script
+like
+[this](https://git.ligo.org/james-clark/gwrucio/blob/master/bin/start_diskcache)
+[Credit: not sure, but probably Ed Maros]
+
+After a short time, there is an ascii-dump of the frame cache at:
+```
+/home/jclark/Projects/rucio-O3/CNAF/diskcache/frame_cache_dump
+```
+
 
 ## Offline registration