Re: Imaging a "live" system

From: Jason Robertson (jasonat_private)
Date: Wed Jun 19 2002 - 17:37:02 PDT

  • Next message: Robert Goto: "Re: Stand-alone Hard Drive Duplicating Devices"

    Would this not be a possible thing to maintain a live image of  a 
    system, through something like a journalled file system, though again, 
    this could be better if you could design a file system with a few 
    things.
    
    First an Overlay Filesystem, (there is 2 OFS's that do exist both are 
    still lacking, due to implementation problems, could be solved with 
    making a virtual file system, like a raid 5 system), but in the most 
    basic sense, you would have the primary medium being a read only 
    system, eg some of the old seagate HD's had a readonly pin, or CDR.
    then you would overlay that file system, with a RW file system, so that 
    you could update, and change files, and this would not cause problems 
    with the base system, and if it is done right you could in theory 
    rebuild on a regular basis the RO version.
    
    Now the next thing to add to this, is a transaction log as found in SQL 
    database.  Therefore transactions could be rolled back, but this could 
    be done on a WORM style of medium, therefore all changes are one way 
    keeping a record of actions.
    
    If anyone steals my idea, at least give me credit for it, such as 
    "Thanks for nothing, Jason" j/k
    
    jason
    
    
    --
    Jason Robertson                
    Now at the Nation Research Council.
    
    
    
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