Messages in this thread | | | From | Andreas Dilger <> | Date | Tue, 16 Jul 2002 13:49:29 -0600 | Subject | Re: [ANNOUNCE] Ext3 vs Reiserfs benchmarks |
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On Jul 16, 2002 21:38 +0200, Matthias Andree wrote: > On Tue, 16 Jul 2002, Christoph Hellwig wrote: > > On Tue, Jul 16, 2002 at 02:53:01PM +0200, Matthias Andree wrote: > > > Not if some day somebody implements file system level snapshots for > > > Linux. Until then, better have garbled file contents constrained to a > > > file than random data as on-disk layout changes with hefty directory > > > updates. > > > > or the blockdevice-level snapshots already implemented in Linux.. > > That would require three atomic steps: > > 1. mount read-only, flushing all pending updates > 2. take snapshot > 3. mount read-write > > and then backup the snapshot. A snapshots of a live file system won't > do, it can be as inconsistent as it desires -- if your corrupt target is > moving or not, dumping it is not of much use.
Luckily, there is already an interface which does this - sync_supers_lockfs(), which the LVM code will use if it is patched in.
Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
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