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Domain: bmsi.com
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Journaling Filesystems and Network Mirroring?
CustomDesigned asks: "We are looking at the feasibility of mirroring all changes to selected filesystems to a hot backup over an internet or WAN link. This would provide a degree of protection for a business in the wake of a disaster like Sep 11. It seems that journaling filesystems have much of the work already done. All that is needed is a hook to copy log data into a message queueing system for delivery to the hot backup, and then running fsck for the unmounted file system to apply each log update. (This is more complex for ext3 where the log data is kept internally within the filesystem.) One problem is that JFS (and I presume ext3) only journal filesystem metadata. Has anyone seen a fully journaling filesystem? Is there any other work on remote hot backups for Linux? The toolset for any such capability should include a way to measure bandwidth required for a given filesystem without actually doing it. This would allow intelligent administrative decisions to balance bandwidth costs against traditional removable media backups."