> I get /dev/md5, /dev/md6, /dev/md7 > and /dev/md8 all with the same UUID! It seems that there is a bug in mdadm: when generating the UUID for a volume, the random() function is called, but the random sequence is never initialized. The result is that every volume created with mdadm has an uuid of: 6b8b4567:327b23c6:643c9869:66334873 See also Debian bug 292784 at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=292784 I fixed the problem adding the following patch to mdadm.c, but please bear in mind that I'm totally unaware of mdadm code and quite naive in C programming: $ diff -u mdadm.c.orig mdadm.c --- mdadm.c.orig 2004-11-02 06:11:06.000000000 +0100 +++ mdadm.c 2005-02-02 14:27:55.000000000 +0100 @@ -86,6 +86,15 @@ ident.super_minor= UnSet; ident.devices=0; + int my_fd; + unsigned int my_seed; + if ((my_fd = open("/dev/random", O_RDONLY)) != -1) { + if (read(my_fd, &my_seed, sizeof(my_seed)) == sizeof(my_seed)) { + srandom(my_seed); + } + close(my_fd); + } + while ((option_index = -1) , (opt=getopt_long(argc, argv, short_options, long_options, -- Niccolo Rigacci http://www.texnet.it/ - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
