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recovering a deleted file from a VM snapshot?

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http://serverfault.com – Our mysql ibdata1 file was deleted earlier today. This wasn't noticed until mysqld was restarted and there was no data in the tables. The machine is a CentOs VM in Xenserver. At this point a snapshot was taken. Then the mysql database was dropped and restored from a backup. The backup not as current as I'd like it to be. I've been researching ways that ibdata might be recovered from the snapshot (ext3grep, undelete) and I briefly tried them on the machine after the snapshot but before giving up and restoring the old backups. I am looking at the snapshot now, trying to figure out how get (HowTos)