Magento site down due to mysql error General error: 1030 Got error -1 from storage engine

This error is generated when InnoDB cannot write to its data files.

I have seen reports of this when the disk is full.
if the files or folder permission changed so you can't write to them.
try deleting the folders var/cache and var/session.

Another report was when someone enabled innodb_force_recovery to a value greater than 0, not realizing that in recovery modes >0, InnoDB is effectively read-only.

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