[SunRescue] Tape drive

[Ken Hansen]

Have you looked at the plan 9 file system? The way the boys in Murry Hill
have implemented file storage is very cool (RAM to local disks, local disks
to optical discs for long-term backup - files propogate through this
hierarch as they are accessed, if they stagnate, they page out of RAM to
local disk, then local disk to optical - there is only one copy at any one
time - no need to delete in most circumstances, and the backups are keyed to
points in time - like nightly)...

Cool, but a lot of set up for just one tinkerer...

Ken

----- Original Message -----
From: "Joshua D. Boyd" <jdboyd at cs.millersville.edu>
To: <rescue at sunhelp.org>
Sent: Saturday, May 19, 2001 8:13 PM
Subject: Re: [SunRescue] Tape drive


> Can you make the things keep a complete journal of all changes, so that
> you can effect roll back the clock to any previous state?  I've always
> wanted a file system that could do that.  I've seen a few that kinda did
> what I wanted, but they were kinda strange.  More like an NFS serverlet
> strapped onto the front of a code revision system.  Maybe someday I'll
> write my own.  From what I've seen, if could be written as a NFS server
> without to much trouble.  Then, you just mount the NFS file system locally
> as something like /home.  Then, no matter how stupid your users are, you
> could probably restore any mistakes they make.
>
> --
> Joshua Boyd
>
> On Sat, 19 May 2001, Bill Bradford wrote:
>
> > On Sat, May 19, 2001 at 06:45:43PM -0500, Bill Bradford wrote:
> > > They simply DO NOT BREAK.
> >
> > Oh, the other thing - built-in filesystem snapshots.
> >
> > Say you've got something in a NetApp-mounted directory, that you
> > accidentally deleted:
> >
> > On a netapp:
> >
> > # rm passwd
> > # ls passwd
> > passwd: No such file or directory
> >
> > "oops"
> > "oh shit"
> >
> > # cd .snapshot
> > # cp passwd ../
> > # cd ..
> > # ls -al passwd
> > -r--r--r--   1 root     sys         2398 May  9 13:51 passwd
> > #
> >
> > "yay"
> >
> > You can have it snapshot the filesystem once an hour, once a day,
> > etc... and you can have multiple snapshots, as well, if you need
> > to get an older version of a file..
> >
> > Bill
> >
> > --
> > Bill Bradford
> > mrbill at mrbill.net
> > Austin, TX
> > _______________________________________________
> > rescue maillist  -  rescue at sunhelp.org
> > http://www.sunhelp.org/mailman/listinfo/rescue
> >
>
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