Initial remote commit

test/jj.sh

@@ -0,0 +1,21 @@
+python3 -c "
+# Read actual PERC metadata chunks - these are NOT zeros
+# They're at every 5th chunk position on each physical disk
+# For disk 0 (sda), metadata chunks are at:
+# phys_byte = data_offset + group*5*CHUNK + 4*CHUNK
+# i.e., chunk positions 4, 9, 14, 19... of each disk
+
+CHUNK = 128*512  # 64KB
+LV_START = 5120000*512
+
+# Read first few metadata chunks from sda
+with open('/dev/sda','rb') as f:
+    for chunk_num in [4, 9, 14, 19, 24]:
+        phys = LV_START + chunk_num * CHUNK
+        f.seek(phys)
+        data = f.read(512)
+        nonzero = sum(1 for b in data if b != 0)
+        print(f'sda metadata chunk {chunk_num}: '
+              f'phys={phys} nonzero={nonzero}/512 '
+              f'first8={data[:8].hex()}')
+"