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Old 05-19-2005, 11:52 AM   #1
Thaidog
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Question What is a filesystem snapshot?


What is a filesystem snapshot? I see this term a lot when talking about the Solaris filesystems.
 
Old 05-19-2005, 01:02 PM   #2
azucaro
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I use Solaris at work. When we refer to file system snapshots, it just means that we are backing up a certain directory (say /home/user/docs) so that if we screw something up we can restore that file system to have it back the way it was.

As far as something intrinsic to the OS, I haven't heard of anything. I'd assume that when people talk about filesystem backups they are maybe just talking about a utility that makes routine and/or scheduled backups (like cron or autosys).
 
Old 05-19-2005, 03:38 PM   #3
jlliagre
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A Solaris file system snapshot, is a "frozen" image of a whole file-system.
After the snapshot is created, any modification on the underlying live filesystem is still possible, but is invisible to the snapshot. It's primary use is for backups, but you can certainly find other interest on it.
A very interesting features of the next Solaris filesystem (ZFS), is the possibility to have read-write snapshots !
Great for experiencing.
 
Old 05-19-2005, 09:27 PM   #4
Thaidog
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Quote:
Originally posted by jlliagre
A Solaris file system snapshot, is a "frozen" image of a whole file-system.
After the snapshot is created, any modification on the underlying live filesystem is still possible, but is invisible to the snapshot. It's primary use is for backups, but you can certainly find other interest on it.
A very interesting features of the next Solaris filesystem (ZFS), is the possibility to have read-write snapshots !
Great for experiencing.
That's what I thought it meant... kind the same way vmware makes a "snapshot" of an VM host OS. I can't wait for zfs to make it out... sounds awsome! 128bit!
 
  


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