[GENERAL] What happens when wal fails?

[Joseph Shraibman]

If I put the pg_xlog directory on its own disk, then that disk fails, 
does that mean the postgres is hosed or does it just mean that postgres 
no longer safe from a power outage?  Does pg detect a problem with the 
wal and then call fsync() on the database files if wal isn't working?

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