Hi, > > OpenSolaris snv 134 always mounts the youngest session.
> You'll have to forgive me, but I don't know what this means. Would that > mean that only the last files written can be seen, or all of them? You see all files which you added (and did not delete later). The capability to access older states is interesting with incremental backups. ISO 9660 multi-session works like this: The new session adds a new superblock, a new complete directory tree, and the content of data files which were newly added or overwritten by the session. The older superblocks and directory trees still exist on the disc. They may point to older versions of files which got replaced by other content in further sessions, and they may contain files which were deleted from the directory tree of the younger sessions. Operating systems by default use the youngest superblock and directory tree for mounting. But as said, mounting older sessions imight be desirable with incremental backups. E.g. if i want to mount the backup state of three days ago, i put in my backup BD-R and do xorriso -indev /dev/sr2 -toc which tells me TOC layout : Idx , sbsector , Size , Volume Id ISO session : 1 , 0 , 1461973s , HOME_2015_01_05_130954 ISO session : 2 , 1462144 , 53613s , HOME_2015_01_06_114520 ... ISO session : 126 , 8364224 , 54847s , HOME_2015_05_10_113721 ISO session : 127 , 8419232 , 62170s , HOME_2015_05_11_120517 ISO session : 128 , 8481568 , 63170s , HOME_2015_05_12_135346 Media summary: 128 sessions, 8544896 data blocks, 16.3g data, 7177m free If i then execute (on Linux) mount -o sbsector=8364224 /dev/sr2 /mnt/iso i get to see the backup state of may 10 2015, 11:37:21. There is some convenience built in. The run xorriso -mount_cmd /dev/sr2 volid '*_2015_05_10_*' /mnt/iso on Linux makes this proposal of a mount command: mount -t iso9660 -o nodev,noexec,nosuid,ro,sbsector=8364224 '/dev/sr2' '/mnt/iso' On FreeBSD the proposal would rather look like mount_cd9660 -o noexec,nosuid -s 8364224 '/dev/cd1' '/mnt/iso' A privileged user may also do xorriso -osirrox on -mount /dev/sr2 volid '*_2015_05_10_*' /mnt/iso and have the proposed command executed directly by xorriso. (One still has to umount manually, when done.) My backup sessions got their volume ids with time stamp by xorriso command -volid HOME_"$(date '+%Y_%m_%d_%H%M%S')" when the backups were made. (See man page example "Incremental backup of a few directory trees".) -- To UNSUBSCRIBE, email to cdwrite-requ...@other.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@other.debian.org Archive: https://lists.debian.org/21026569886338335...@scdbackup.webframe.org