On Fri, Sep 23, 2011 at 08:35:55AM -0000, Phil Ayres wrote: > Out of interest, are the checksums that are different on zero byte > files? I saw that hinted elsewhere. No. No zero size files. All are files with sizes from 125 to 133478 bytes (24-280 blocks). One unusual common factor is that all the files whose checksums change have between 2 and 186 hard links. No single-link files. Below is the raw data collected from my tests today. I run an enhanced md5sum on the directory and save the results. (Enhanced means the md5sum is saved along with a Perl "stat" of the file - see "man perlfunc" for the order of the 13 fields from "stat".) I then loop, running the enhanced md5sum and comparing the new results with the saved. When something differs, I output info about the saved and the new. So what you see below is pairs of lines where the inode numbers (third field) are the same between runs but the md5sums differ. Not every run produces differences - it's about one run in four. A run with differences usually shows only one or two differences, but one run today turned up eight. Most of the differences in md5sums are unique (only happened to that inode once during my half-day of testing), but six inodes appear twice and one appears three times (inode 5260333, the one with 186 hard links). 1f9656d3d4e6379cd02c81d6b5125a41 25 5125149 33188 2 777 777 0 875 1316720060 1001274528 1286771949 4096 24 4c19712378cc9074f5aa01c16a53dd8f 25 5125149 33188 2 777 777 0 875 1316720060 1001274528 1286771949 4096 24 464025ab8ecca844ef14927d2ebbfe7f 25 5124704 33188 2 777 777 0 147 1316720060 938293572 1286771949 4096 24 7806d1a26b5ce00b3079d97c29ff2bd6 25 5124704 33188 2 777 777 0 147 1316720060 938293572 1286771949 4096 24 19d7c14415e33af9cbd0e70fbb002e77 25 6685993 33056 2 777 777 0 10240 1316720036 1200422921 1286771775 4096 40 83a70208705f5934366b108aff9d3116 25 6685993 33056 2 777 777 0 10240 1316720036 1200422921 1286771775 4096 40 7c6351e26037a45d2279be4ffb4b6563 25 6686006 33056 2 777 777 0 10240 1316720036 1204740421 1286771775 4096 40 b7f958f96a2ec4a4835ed29fd2bbf70e 25 6686006 33056 2 777 777 0 10240 1316720036 1204740421 1286771775 4096 40 20df6ab0a39207fe7049ede1ea685f75 25 6686420 33056 2 777 777 0 10240 1316720036 1201029149 1286771775 4096 40 d222ff46ee1f1e489391e53c89f36909 25 6686420 33056 2 777 777 0 10240 1316720036 1201029149 1286771775 4096 40 22bfb8c1dd94b5f3813a2b25da67463f 25 5260333 33188 186 777 777 0 220 1316719636 1268985590 1306955878 4096 24 7faace8dee9768922d3dacc09723d1ae 25 5260333 33188 186 777 777 0 220 1316719636 1268985590 1306955878 4096 24 22bfb8c1dd94b5f3813a2b25da67463f 25 5260333 33188 186 777 777 0 220 1316719636 1268985590 1306955878 4096 24 7faace8dee9768922d3dacc09723d1ae 25 5260333 33188 186 777 777 0 220 1316719636 1268985590 1306955878 4096 24 260c0685b36144d0cad219a98a03079d 25 5124701 33188 2 777 777 0 125 1316720060 938295176 1286771948 4096 24 8e342f7915ece5de1b6a1924a2a00470 25 5124701 33188 2 777 777 0 125 1316720060 938295176 1286771948 4096 24 4ca1bba41e08525aa560ed866e51c24c 25 1705464 33248 2 777 777 0 12478 1316719610 1037991716 1286771882 4096 48 602838f84c4304c81e73066f47cd1b5d 25 1705464 33248 2 777 777 0 12478 1316719610 1037991716 1286771882 4096 48 904c644ce1d1bc265921386556ea1bad 25 1705529 33248 2 777 777 0 11957 1316719610 1037727676 1286771882 4096 40 d58bb2e8836f01ad320d7c33cae89798 25 1705529 33248 2 777 777 0 11957 1316719610 1037727676 1286771882 4096 40 0a0b7b2e5561b7235919dc34b909ea04 25 1705533 33248 2 777 777 0 9394 1316719610 1037929780 1286771882 4096 40 183be05e74b50d95526a286b8feab60b 25 1705533 33248 2 777 777 0 9394 1316719610 1037929780 1286771882 4096 40 58a90406649b9e795f9e1e6b34b806f8 25 5124983 33188 2 777 777 0 1132 1316720061 938293572 1286771949 4096 24 c68292cceb13f21de7375c46c0ffdf9a 25 5124983 33188 2 777 777 0 1132 1316720061 938293572 1286771949 4096 24 a51ac5f63a943338432ab1555381d2fc 25 5256692 33188 115 777 777 0 3157 1316719636 1271136989 1306955881 4096 24 c3df0906b29c72465f1d84e2867a8c08 25 5256692 33188 115 777 777 0 3157 1316719636 1271136989 1306955881 4096 24 a51ac5f63a943338432ab1555381d2fc 25 5256692 33188 115 777 777 0 3157 1316719636 1271136989 1306955881 4096 24 c3df0906b29c72465f1d84e2867a8c08 25 5256692 33188 115 777 777 0 3157 1316719636 1271136989 1306955881 4096 24 27a19bef1415f9036457b9e57ea4fdd5 25 6033732 33060 14 777 777 0 4072 1316719547 947301176 1286769912 4096 24 e111a205ecec740acf2e03535b3f8671 25 6033732 33060 14 777 777 0 4072 1316719547 947301176 1286769912 4096 24 1b7fc68ca9691ab56e7fc45f599fe025 25 6686068 33056 2 777 777 0 10240 1316720036 1205949497 1286771775 4096 40 942f1b10df4cd4600dbfc206dad03e7a 25 6686068 33056 2 777 777 0 10240 1316720036 1205949497 1286771775 4096 40 1349d5b392b52f4b24ccc7c858c63ea9 25 6686160 33056 2 777 777 0 10240 1316720036 1203529538 1286771775 4096 40 96e69563f67ac27e6b7e03b861450431 25 6686160 33056 2 777 777 0 10240 1316720036 1203529538 1286771775 4096 40 12ab0d128aaa5e77ca85d31882b60706 25 6686291 33200 2 777 777 0 9396 1316720036 1203456561 1286771775 4096 40 5edcdcc882c3bad980cbc02721f93e3a 25 6686291 33200 2 777 777 0 9396 1316720036 1203456561 1286771775 4096 40 883768eb1e3e9377d8284010c8ba8657 25 6686322 33200 2 777 777 0 8743 1316720036 1207326386 1286771775 4096 40 bb8545ff7231716152c279ff3c28725d 25 6686322 33200 2 777 777 0 8743 1316720036 1207326386 1286771775 4096 40 1ffc1fd141a07b96a5db5e1a1a4dbe00 25 1708439 33133 10 777 777 0 506 1316719634 891230558 1286771929 4096 24 5951b821abe9437bc523429c87b281c8 25 1708439 33133 10 777 777 0 506 1316719634 891230558 1286771929 4096 24 22bfb8c1dd94b5f3813a2b25da67463f 25 5260333 33188 186 777 777 0 220 1316719636 1268985590 1306955878 4096 24 7faace8dee9768922d3dacc09723d1ae 25 5260333 33188 186 777 777 0 220 1316719636 1268985590 1306955878 4096 24 7fbb5e5a167f24bac8469606a5d0a26a 25 1705521 33248 2 777 777 0 12765 1316719610 1037715886 1286771882 4096 48 f909799efc770c7e5275cb2587627ade 25 1705521 33248 2 777 777 0 12765 1316719610 1037715886 1286771882 4096 48 6be339ebb80cf650c2e7e1a545ce55e9 25 2100149 33133 4 777 777 0 133478 1316719634 892934432 1286771928 4096 280 eac00b606ee3e41e2704f5a8b84892ed 25 2100149 33133 4 777 777 0 133478 1316719634 892934432 1286771928 4096 280 b63596b86cc7390817dbaf5c06310b58 25 5771113 33188 2 777 777 0 21965 1316719610 1134262974 1286771875 4096 64 c1b7d02ae23d495d35f4b90e2a88cedb 25 5771113 33188 2 777 777 0 21965 1316719610 1134262974 1286771875 4096 64 d9557dbb42b9239218a7f8836b7ebe94 25 6033731 33060 14 777 777 0 444 1316719547 947301176 1286769912 4096 24 f84de7d23a7dae7f0aa9c16bcac2bbc6 25 6033731 33060 14 777 777 0 444 1316719547 947301176 1286769912 4096 24 1fe772fe5fb1bfb1d64eccb406f27d91 25 5259850 33188 2 777 777 0 14193 1316719638 1295994736 1306955879 4096 48 57f597aeea9b17df1dbd83af59c1a63f 25 5259850 33188 2 777 777 0 14193 1316719638 1295994736 1306955879 4096 48 65f9e686aebf1e7c83469860e6515384 25 1704789 33188 2 777 777 0 5353 1316719606 1034955974 1286771881 4096 32 a2b44e94321d7bc1e06380840cd079ca 25 1704789 33188 2 777 777 0 5353 1316719606 1034955974 1286771881 4096 32 02a1c2953d90387365c8dbf5893be635 25 4993489 33188 2 777 777 0 941 1316720065 1055055104 1286771945 4096 24 16f53d04f7a4c86f91c963c8c64b5616 25 4993489 33188 2 777 777 0 941 1316720065 1055055104 1286771945 4096 24 51f7c928d629d84372c9157717fb7f24 25 5259831 33188 2 777 777 0 15561 1316719638 1295994736 1306955879 4096 48 ea22194239e8753ad10703053e3197b6 25 5259831 33188 2 777 777 0 15561 1316719638 1295994736 1306955879 4096 48 8b0dd7ab3e6d48ccb79aaaaf7435121a 25 5259832 33188 2 777 777 0 12065 1316719638 1295994736 1306955883 4096 40 f11489ac8b36addf3c03debe422901fd 25 5259832 33188 2 777 777 0 12065 1316719638 1295994736 1306955883 4096 40 517be11438635168168b691cfd899c17 25 5259836 33188 2 777 777 0 11842 1316719638 1295994736 1306955882 4096 40 ce1c22f30fc2835af5c4d08c89865715 25 5259836 33188 2 777 777 0 11842 1316719638 1295994736 1306955882 4096 40 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bbfbf086fe07ad00d1f53db64f30ed09 25 5259899 33188 2 777 777 0 12322 1316719638 1295994738 1306955879 4096 48 3f5f69b3cf16dedb45cee13c7ab059b7 25 6430343 33200 2 777 777 0 9090 1316720038 1169151894 1286771771 4096 40 524686dd4eceb5fce3087316b4c5d172 25 6430343 33200 2 777 777 0 9090 1316720038 1169151894 1286771771 4096 40 24577b4eec93f873513477e29d8acafe 25 6430344 33056 2 777 777 0 10240 1316720038 1169151894 1286771771 4096 40 4c5304fc0aa485ec6155a97fd30e6d8a 25 6430344 33056 2 777 777 0 10240 1316720038 1169151894 1286771771 4096 40 2fa1ea39deb352b6ae6c299e247f6984 25 6432103 33056 2 777 777 0 10240 1316720038 1169747949 1286771772 4096 40 f569dc2ecbe9dd681fe7f42f54cb68aa 25 6432103 33056 2 777 777 0 10240 1316720038 1169747949 1286771772 4096 40 755fd31ebc83f02d76bcc69bacbb9104 25 1708372 33133 6 777 777 0 571 1316719634 889794256 1286771927 4096 24 b376554f519737a92ee3c49dc9126b8f 25 1708372 33133 6 777 777 0 571 1316719634 889794256 1286771927 4096 24 9898979b1fd2290e0a84b7a61a948f69 25 2100112 33133 3 777 777 0 5171 1316719634 893955992 1286771928 4096 32 b0073486c0d777d08935c2de20555c1b 25 2100112 33133 3 777 777 0 5171 1316719634 893955992 1286771928 4096 32 2fa1ea39deb352b6ae6c299e247f6984 25 6432103 33056 2 777 777 0 10240 1316720038 1169747949 1286771772 4096 40 69ea53d5d395c2b66323908936bcab27 25 6432103 33056 2 777 777 0 10240 1316720038 1169747949 1286771772 4096 40 0102ddf40cc9970703be495364f6b49d 25 6553900 33200 2 777 777 0 21562 1316720038 1169144857 1286771772 4096 64 8dd8909086e374795bccdd0cdcaec708 25 6553900 33200 2 777 777 0 21562 1316720038 1169144857 1286771772 4096 64 2729fd22c4e2dc5c7dad55efea59816c 25 5259866 33188 2 777 777 0 11632 1316719638 1295994736 1306955878 4096 40 ef56472cf83a33203cdc9f75cfc96417 25 5259866 33188 2 777 777 0 11632 1316719638 1295994736 1306955878 4096 40 47383a0471b18b60a0927c4938a73590 25 5259896 33188 2 777 777 0 364 1316719638 1295994738 1306955879 4096 24 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5ed806ab2c77de38da87c25f57704a59 25 6444861 33188 2 777 777 0 285 1316719548 1289288995 1289289103 4096 24 1e040e3e9f7cc9090fae3d96a5cd234d 25 1705492 33248 2 777 777 0 10889 1316719610 1037672622 1286771882 4096 40 fa4951d10c02ef6042135cce2c01189f 25 1705492 33248 2 777 777 0 10889 1316719610 1037672622 1286771882 4096 40 7fbb5e5a167f24bac8469606a5d0a26a 25 1705521 33248 2 777 777 0 12765 1316719610 1037715886 1286771882 4096 48 f909799efc770c7e5275cb2587627ade 25 1705521 33248 2 777 777 0 12765 1316719610 1037715886 1286771882 4096 48 7dfae954d7c6f4787d9236c989e2217f 25 1705492 33248 2 777 777 0 10889 1316719610 1037672622 1286771882 4096 40 fa4951d10c02ef6042135cce2c01189f 25 1705492 33248 2 777 777 0 10889 1316719610 1037672622 1286771882 4096 40 1010c5075017a665a9799aede68339ac 25 2100092 33133 8 777 777 0 2636 1316719634 891569196 1286771928 4096 24 55c4334ea6da9faf5a1d3c95c1103c3e 25 2100092 33133 8 777 777 0 2636 1316719634 891569196 1286771928 4096 24 3fb139d7a83c75b221da0f1cf6226207 25 2100807 33133 6 777 777 0 1642 1316719634 889568628 1286771929 4096 24 66af1020d4cec3603b158afe92492351 25 2100807 33133 6 777 777 0 1642 1316719634 889568628 1286771929 4096 24 6259773096a72272aae4ed28a6a362f1 25 6430577 33056 2 777 777 0 20480 1316720037 1175010335 1286771771 4096 56 dac8608422c39ab642eef0100e112053 25 6430577 33056 2 777 777 0 20480 1316720037 1175010335 1286771771 4096 56 ea01946c5d66c28f3471bfc286bda3a7 25 5124374 33188 5 777 777 0 1205 1316720061 966839592 1286771948 4096 24 ea62a726ee2b908cf45086f235c2a727 25 5124374 33188 5 777 777 0 1205 1316720061 966839592 1286771948 4096 24 -- | Ian! D. Allen -