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Fossil is the default file system in Plan 9 from Bell Labs. It serves the network protocol 9P and runs as a user space daemon, like most Plan 9 file servers. Fossil is different from most other file systems due to its snapshot/archival feature. It can take snapshots of the entire file system on command or automatically (at a user-set interval). These snapshots can be kept on the Fossil partition as long as disk space allows; if the partition fills up then old snapshots will be removed to free up disk space. A snapshot can also be saved permanently to Venti. Fossil and Venti are typically installed together. == Features == Important features include: *Snapshots are available to all users. No administrator intervention is needed to access old data. (This is possible because Fossil enforces file permissions; users can only access data which they would be allowed to access anyway; thus a user cannot snoop on another's old files or look at old passwords or such.) *Data in permanent snapshots (sometimes called archives) cannot be modified. Only the non-permanent snapshots can be removed. To access a snapshot, one would connect to a running fossil instance (“mount” it) and change directory to the desired snapshot, e.g. ''/snapshot/yyyy/mmdd/hhmm'' (with ''yyyy'', ''mm'', ''dd'', ''hh'', ''mm'' meaning year, month, day, hour, minute). To access an archive (permanent snapshot), a directory of the form ''/archive/yyyy/mmdds'' (with ''yyyy'', ''mm'', ''dd'', ''s'' meaning year, month, day, sequence number) would be used. Plan 9 allows modifying the namespace in advanced ways, like ''redirecting'' one path to another path (e.g. ''/bin/ls'' to ''/archive/2005/1012/bin/ls''). This significantly eases working with old versions of files. Fossil is available on several other platforms via Plan 9 from User Space. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fossil is the default file system in Plan 9 from Bell Labs. It serves the network protocol 9P and runs as a user space daemon, like most Plan 9 file servers. Fossil is different from most other file systems due to its snapshot/archival feature. It can take snapshots of the entire file system on command or automatically (at a user-set interval). These snapshots can be kept on the Fossil partition as long as disk space allows; if the partition fills up then old snapshots will be removed to free up disk space. A snapshot can also be saved permanently to Venti. Fossil and Venti are typically installed together.== Features ==Important features include:*Snapshots are available to all users. No administrator intervention is needed to access old data. (This is possible because Fossil enforces file permissions; users can only access data which they would be allowed to access anyway; thus a user cannot snoop on another's old files or look at old passwords or such.)*Data in permanent snapshots (sometimes called archives) cannot be modified. Only the non-permanent snapshots can be removed.To access a snapshot, one would connect to a running fossil instance (“mount” it) and change directory to the desired snapshot, e.g. ''/snapshot/yyyy/mmdd/hhmm'' (with ''yyyy'', ''mm'', ''dd'', ''hh'', ''mm'' meaning year, month, day, hour, minute). To access an archive (permanent snapshot), a directory of the form ''/archive/yyyy/mmdds'' (with ''yyyy'', ''mm'', ''dd'', ''s'' meaning year, month, day, sequence number) would be used. Plan 9 allows modifying the namespace in advanced ways, like ''redirecting'' one path to another path (e.g. ''/bin/ls'' to ''/archive/2005/1012/bin/ls''). This significantly eases working with old versions of files.Fossil is available on several other platforms via Plan 9 from User Space.」の詳細全文を読む スポンサード リンク
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