diff --git a/changelog/items/other/dump-disk-space-usage.md b/changelog/items/other/dump-disk-space-usage.md
new file mode 100644
index 00000000..3c1c3147
--- /dev/null
+++ b/changelog/items/other/dump-disk-space-usage.md
@@ -0,0 +1,2 @@
+- Dump disk space usage when health-checker script disables portal due to
+  critical free disk space.
\ No newline at end of file
diff --git a/setup-scripts/disk-usage-dump.sh b/setup-scripts/disk-usage-dump.sh
new file mode 100644
index 00000000..9326d459
--- /dev/null
+++ b/setup-scripts/disk-usage-dump.sh
@@ -0,0 +1,59 @@
+#!/bin/bash
+
+# Dumps disk usage to stdout or to the file
+#
+# Parameters:
+# - $1 (optional): Filename to append the output to.
+#
+# Usage:
+# - Dump disk usage to stdout:
+#   ./disk-usage-dump.sh
+#
+# - Dump disk usage appending to th file:
+#   ./disk-usage-dump.sh my-log-file.log
+#
+# Use docker container to get root (script can be run under regular user, no
+# need for sudo)
+
+dump () {
+    echo
+    echo "### Disk usage dump at $(date) ###"
+
+    # Free disk space
+    echo
+    df -h /home/user
+
+    # Home dirs
+    echo
+    echo "Home dirs:"
+    docker run -v /home/user:/home/user alpine:3.15.0 du -hs /home/user/*
+
+    # Docker data dirs
+    echo
+    echo "Docker data dirs:"
+    docker run -v /home/user:/home/user alpine:3.15.0 du -hs /home/user/skynet-webportal/docker/data/*
+
+    # Largest dirs/files
+    echo
+    echo "Dirs or files over 1GB (first 100):"
+    docker run -v /home/user:/home/user alpine:3.15.0 du -h /home/user | grep -E "^[0-9]+\.?[0-9]*G" | sort -r -n | head -100
+}
+
+# Check argument is present
+if [ -z "$1" ]; then
+    # Dump to stdout
+    dump
+else
+    # Handle log paths
+    filename=$(basename "$1")
+    dirname=$(dirname "$1")
+    abs_dirname=$(realpath "$dirname")
+
+    # Make sure log dir exists
+    mkdir -p "$abs_dirname"
+
+    # Append to file
+    {
+        dump
+    } >> "$abs_dirname/$filename" 2>&1
+fi
diff --git a/setup-scripts/health-checker.py b/setup-scripts/health-checker.py
index a2bbbcea..c5023bf8 100755
--- a/setup-scripts/health-checker.py
+++ b/setup-scripts/health-checker.py
@@ -37,6 +37,9 @@ GB = 1 << 30  # 1 GiB in bytes
 FREE_DISK_SPACE_THRESHOLD = 100 * GB
 FREE_DISK_SPACE_THRESHOLD_CRITICAL = 60 * GB
 
+# Disk usage dump log file (relative to this .py script).
+DISK_USAGE_DUMP_LOG = "../../devops/disk-monitor/disk-usage-dump.log"
+
 setup()
 
 
@@ -103,6 +106,11 @@ async def check_disk():
         message = "CRITICAL! Very low disk space: {}GiB, **siad stopped**!".format(
             free_space_gb
         )
+
+        # dump disk usage
+        script_dir = os.path.dirname(os.path.realpath(sys.argv[0]))
+        os.popen(script_dir + "/disk-usage-dump.sh " + script_dir + "/" + DISK_USAGE_DUMP_LOG)
+
         inspect = os.popen("docker inspect sia").read().strip()
         inspect_json = json.loads(inspect)
         if inspect_json[0]["State"]["Running"] is True: