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