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Re: How to freeze & thaw ext2(ext3) file system?



On Mon, Jul 08, 2002 at 01:42:07AM -0700, Satish Singhal wrote:
> hi...
> 
> i intend to develop a backup application for linux
> platform...
> 
> the workflow is as follows:
> - freeze the file-system(ext2 or ext3)
> - take the bckup
> - release the file system.
> 
> i am not able to find the relevant ioctl or api for
> freezing & releasing the file system...
> 
> so... i need some help...

Do you mean mount the filesystems read-only? If so, this is the command to
run:

# mount -o remount,ro <filesystem>

You will probably have to use lsof to make sure no processes are running on
that filesystem.

Another way to do this is if you are backing up a major filesystem (like /
or /usr) is just to go down to single-user mode, do the backup, and bring
it back up to the default run-level (3 or 5, generally).

-- 
-- Skylar Thompson (skylar attglobal net)

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