From 002a86dc2face75bf0d95409c5d89b0e688058aa Mon Sep 17 00:00:00 2001
From: Lukas Kugler <lukas.kugler@univie.ac.at>
Date: Wed, 5 Feb 2025 16:45:18 +0000
Subject: [PATCH] remark on large domains

---
 WRF/WRF_basic.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/WRF/WRF_basic.md b/WRF/WRF_basic.md
index 597e065..d9ee946 100644
--- a/WRF/WRF_basic.md
+++ b/WRF/WRF_basic.md
@@ -306,4 +306,6 @@ Variables are then accessible as `wrf.u`, `wrf.v` etc.
 
 ### Important namelist settings
 
-
+#### Input/output format for large domains
+For domain sizes larger than about 2300x2300x100, it is necessary that `io_form_input` and `io_form_history` are identical.
+Option 11 requires the pnetcdf library to be installed and linked with WRF. With option 102, each process writes its own file. Thus, a joiner program is required that combines all files into one file per timestep.
-- 
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