Hi, I try to use Python (3) to verify the checksum at the end of a BlueStore superblock, but I cannot figure it out how to do it. In my test scenario, the superblock is 0x158 bytes long (starting with "bluestore block device\n<uuid>\n"), then 4 bytes of CRC32 follow. In my case the checksum is 0xb759e167. To verify the checksum I read bytes 0x0-0x157 and compute the CRC32. As I understand the code, the CRC is initialized with -1. Therefore my code looks like this: crc = binascii.crc32(f.read(0x158), -1) And afterwards crc contains 0xbaa01c56. I tried several Python libraries for CRC32 computation and cannot get it working with any of them. I guess I miss something, like an extra step, or I have to use a certain lib. Maybe somebody of you got an idea. Thanks in advance, Florian _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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