Processing of --update blocks removal of homehost from existing arrays even though new arrays can be created without an embedded homehost. Is there any concern allowing --update to remove of homehost from existing arrays? The code for init_super1() shows that when creating a new array, it is possible to exclude homehost: https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/tree/super1.c#n1656 if (homehost && strchr(name, ':') == NULL && strlen(homehost) + 1 + strlen(name) < 32) { strcpy(sb->set_name, homehost); strcat(sb->set_name, ":"); strcat(sb->set_name, name); } else { int namelen; namelen = min((int)strlen(name), (int)sizeof(sb->set_name) - 1); memcpy(sb->set_name, name, namelen); memset(&sb->set_name[namelen], '\0', sizeof(sb->set_name) - namelen); } The code for update_super1() shows that while it is possible to use --update to modify homehost for an array, it is not possible to remove homehost from an existing array: https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/tree/super1.c#n1196 if (update == UOPT_HOMEHOST && homehost) { /* * Note that 'homehost' is special as it is really * a "name" update. */ char *c; update = UOPT_NAME; c = strchr(sb->set_name, ':'); if (c) snprintf(info->name, sizeof(info->name), "%s", c + 1); else snprintf(info->name, sizeof(info->name), "%s", sb->set_name); } Earl
